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Practical Cryptography

timothy posted more than 10 years ago | from the below-the-subtext dept.

Encryption 140

jpetts writes "If you have an interest in cryptography and spend even a small amount of time looking at the subject on the Internet, you will almost certainly have come across the name Bruce Schneier. His book, Applied Cryptography is widely regarded as the most accessible, and one of the most important books on cryptographic algorithms ever published. Schneier has also published other books, including the less technical Secrets and Lies, an thought-provoking book aimed at getting people to think about the whole of the security landscape, not just cryptography. Now, together with Niels Ferguson, renowned cryptographic expert, and longtime collaborator, another immensely valuable book on security has just appeared." Read on for the rest of jpetts' review.

Schneier is one of the world's foremost experts, not just on cryptography, but also on security. It was as he delved deeper into the security of cryptographic systems that he realised that even though - theoretically at least - cryptography could be made arbitrarily secure, this was one of the more tractable problems in the security puzzle. For this reason, his company, Counterpane repositioned itself as a managed security company, rather than continuing to focus solely on cryptography. This transition was also reflected in his publication of Secrets and Lies (SL), which is very different in tone and focus from Applied Cryptography (AC). So where does Practical Cryptography (PC) fit in, and what does it offer? For me, the answer is that it lies pretty much squarely in the middle of the line reaching from AC to SL.

There is no shortage of products in the cryptography arena, but the vast majority of these attract undisguised scorn from professional cryptographers (at least those who can be bothered to comment on them), and although I am only an amateur in this field, I take it as axiomatic that only peer-reviewed cryptosystems (algorithms, protocols, etc) which have stood the test of time are worth taking even a preliminary peek at. This includes many that are described in AC. However, One of the problems with AC, openly acknowledged by the author, is that it contains essentially no implementation details. Furthermore, the cryptographic field has moved on since its publication, most notably with the adoption of Rijndael as the Advanced Encryption Standard, now a mandated Federal Information Processing Standard.

The source code to AC has been available from pretty much the moment of the book's publication, but one of the problems which faced a would-be cryptographic coder, is how to produce a working cryptographic product based on the routines that one could lay one's hands on. Merely incorporating the source code in a program does not a cryptosystem make: as Schneier points out cryptography is hard. And this is where this new book is invaluable: it tells you in great detail how hard it is, what the hardest parts are, and how you can maximise the return on the effort you may invest in developing cryptographic software.

The book pulls no punches, and does not gloss over any issues relating to implementing cryptographic systems. It deals with all the major components of a practical cryptosystem: the book's major sections are titled Message Security, Key Negotiation, Key Management and Miscellaneous.

Within each of these sections there are several chapters, covering virtually all the salient points imaginable, right down to the fundamentals. For example, the first chapter of the Key Management section deals with the clock. It explains from first principles the need for a clock: "At first glance, [a clock] is a decidedly un-cryptographic primitive, but because the current time is often used in cryptographic systems, we need a reliable clock." It is this sort of attention to particular implementation details that turns PC from a mere recipe book into an invaluable reference and a true cookbook.

Another invaluable feature is the generous use of pseudocode snippets, not only for algorithmic details, such as MACs and block cyphers, but also for higher-level operations like sending and receiving messages.

Ferguson and Schneier are refreshingly frank, too. Where they believe strongly in something, they let you know it. For example, the first paragraph of chapter 23, Standards, contains the statement that "[s]ecurity standards rarely work," while the authors go even further when dealing with X.509 certificates, stating on p.339, "[w]hatever you do, stay away from X.509 certificates. If you need a reason, read [40] and weep". This candour is refreshing, especially when juxtaposed with the weasel words that so many consultants and software vendors seem to rely on. However, this advice is not just given in curmudgeonly fashion, and when the authors discuss the matter of X.509 in a different context, they add, humorously, "[i]f you must use X.509, you have out condolences."

I am tempted to continue to analyse the book at great length, but to save space I will just highlight some further jewels from this work:

  • Implementation issues such as swap files, language-specific memory handling behaviour, caches, etc. are covered in enough detail for you to understand how to do things, and more importantly, how not to do things.
  • Randomness, pseudo-randomness and entropy are covered in enough depth for an implementor to avoid pitfalls, and pseudocode examples are given.
  • Mathematical topics such as prime numbers, groups and large integer arithmetic are described in excellent detail.
  • PKI, its promise, and failure are covered with wit and wisdom.
As you can probably guess from the above description, I believe that the real value of this book lies in the fact that two renowned experts, in both theory and practice, are sharing what works, and more importantly what you should avoid like the plague when working with cryptosystems. This information has until now generally only been available by listening to people like Schneier and Ferguson talk, either one-to-one or at conferences. Even then, the authors point out that even talking to "experts" is not without danger: chapter 25 begins "There is something strange about cryptography: everybody thinks they know enough about it to design and build their own system. We never ask a second-year physics student to design a nuclear power plant. We wouldn't let a trainee nurse who claims to have found a revolutionary method for heart surgery operate on us. Yet people who have read a book or two think they can design their own cryptographic system. Worse still, they are sometimes able to convince management, venture capitalists, and even some customers that their design is the neatest thing since sliced bread." Given this statement, some people might claim that this book is a little hubristic, but I disagree. Paranoia, self evaluation and a healthy scepticism are pre-requisites for assessing, deploying and implementing cryptosystems, but since a sine qua non of reliable crypto is open examination and peer evaluation, I believe that the authors are here simply offering advice, which once you understand more about the issues surrounding crypto, is merely common sense. Schneier and Ferguson have both "earned their bones" in the glaring light of crypto, and this book admirably fills an obvious gap in the literature of the field. There is not, to my knowledge, another book like it on the subject, and had it been published at around the same time as AC, I am sure that it would have been regarded by the NSA as even more dangerous than that book. After all, it is frighteningly easy for the uninformed to take good cryptographic algorithms and protocols, and through ignorance turn them into worse-than-useless crypto products.

Is there anything I didn't like about the book? Frankly, no. Some might complain that it is priced too high (it lists at USD50 for the softcover, and USD70 for the hardcover), but it is printed on acid-free paper, and the density of useful advice is such that it outstrips in value many works which cost half the price or less.

If you are interested in crypto, do yourself a favour: buy this book.


You can purchase Practical Cryptography from bn.com. Slashdot welcomes readers' book reviews -- to see your own review here, read the book review guidelines, then visit the submission page.

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140 comments

First Post (-1, Offtopic)

Anonymous Coward | more than 10 years ago | (#5781629)

Worst fp ever!

svefg cbfg (-1, Offtopic)

Anonymous Coward | more than 10 years ago | (#5781630)

svefg cbfg

Re:svefg cbfg (0)

Delirium Tremens (214596) | more than 10 years ago | (#5781709)

svefg cbfg
ROT13[Guvf vf bar bs gur orfg Svefg Cbfgf rire!]

(But your genius will be unappreciated by the Slashdot moderators...)

Re:svefg cbfg (0)

Anonymous Coward | more than 10 years ago | (#5782852)

Ohg vg jnfa'g, jnf vg? Vg jnfa'g rira arneyl SC fgnghf. V zrna, sre pelvat bhg ybhq...

Back, Linux infidels! (-1, Flamebait)

Anonymous Coward | more than 10 years ago | (#5781631)

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You Linux [debian.org]-using fags [nylug.org] cannot possibly comprehend the beauty [hope-2000.org] of the one true goddess!

See how a true believer [spilth.org] honors her. Take another look at the proper way to show your devotion [spilth.org] to the divine babe of BSD [openbsd.org]!

There is truly no hope for Linux [suse.com] as long as the lovely Ceren [madchat.org] smiles upon us!

DMCA (5, Insightful)

ih8apple (607271) | more than 10 years ago | (#5781636)

Isn't this review a violation of the DMCA?


I'm not joking...if you take the wording of the law literally?

Re:DMCA (0)

Anonymous Coward | more than 10 years ago | (#5781880)

Isn't this review a violation of the DMCA?

That depends on the judge and the $$$ spent on lawyers.

Re:DMCA (-1, Flamebait)

Anonymous Coward | more than 10 years ago | (#5781944)

I don't see how the review circumvented a copyright device?

Or are you just stupid?

Re:DMCA (1)

ShadowBottle (663193) | more than 10 years ago | (#5782040)

Anon Coward... what? Can't get a login.. afeared are ye? Stupid? Are you illiterate? Have you not seen the DMCA go after people for providing links and information on where to just FIND information on circumnavigating copyrighting, etc? Smoke something besides crack and c0ck plz K thx

Re:DMCA (5, Funny)

ShadowBottle (663193) | more than 10 years ago | (#5782003)

OMG! He is going to get SO busted. Everybody got their lighters ready for a crypto-book burning session? Always remember, security comes after the wants and needs of the power-mad robber barons of the DMCA. NOOOBODY EXPECTS THE DMCA! Our Cheif Weapon is Ignorance, Ignorance and fear.. no no no our TWO cheif weapons are ignorance, fear and a ruthless abandon from the ways of free thought.. no no no our THREE cheif weapons are ignorance, fear, a ruthless abandondon of free though and ignorance again.. yes.. OUR FOUR CHEIF WEAPONS ARE... Fear that which you cannot understand. ( C; And yeah.. /. is going to get nailed for providing information about where to get information on information that involves circuitous ways of securing information. Fscking rat bastards. May they all burn in hell... securely. ( C: ShadowBottle

Re:DMCA (-1, Flamebait)

Anonymous Coward | more than 10 years ago | (#5782065)

You're not joking, eh? Well then you must be a retard. Tell mommy your computer time is over.

Re:DMCA (1)

Tom7 (102298) | more than 10 years ago | (#5782103)

No. What possibly could be a violation? He's *describing* a book that *describes* encryption algorithms. The DMCA bans *devices* that *circumvent* *technologies* that *control access* to *copyrighted works*. Encryption algorithms don't usually control access, and there's no copyrighted work here (aside from the book itself and the review), discussions and pseudocode don't constitute devices, and there's no circumvention.

Do yourself a favor and read the DMCA. http://www4.law.cornell.edu/uscode/17/1201.html
I t is a lot more specific than you think. It doesn't outlaw encryption, and especially not reviews about discussions of encryption.

Re:DMCA (1, Insightful)

Anonymous Coward | more than 10 years ago | (#5782818)

Encryption algorithms don't usually control access

Considering that the only reason to use an encryption algorithm is to control access to a message, I have to say you don't have a clue what you're talking about. Not only that, your humor detection circuit seems to be on the fritz.

Re:DMCA (1)

Sloppy (14984) | more than 10 years ago | (#5782853)

No, the algorithms have significant other uses, besides bypassing tech measures that limit access to copyrighted works, without authorization.

(And so will DeCSS, if people start using CSS as an alternative to Rot-13ing their Usenet postings. ;-)

First post (-1, Offtopic)

Anonymous Coward | more than 10 years ago | (#5781641)

claimed for the NSA.

brought to you by Echelon.

FP (5, Informative)

jpetts (208163) | more than 10 years ago | (#5781645)

It's probably bad form to be FPer to one's own review, but just to let you know there is an oopsie in my review concerning experts. A paragraph got lost (my fault). Schneier and Ferguson start their chapter with the warning about self-proclaimed experts I mention, but they realldo do recommend using experts: just be careful that they really ARE experts, not flim-flam artists.

Re:FP (4, Funny)

B3ryllium (571199) | more than 10 years ago | (#5781721)

Whenever I'm contracted as a security expert, I *always* highly recommend ROT13.

I'm looking into this thing called a "caesar cipher", but it's slow going. I think it needs to be applied 13 times before the data is sufficiently encrypted.

You call yourself an expert? (3, Funny)

Anonymous Coward | more than 10 years ago | (#5782775)

I think it needs to be applied 13 times before the data is sufficiently encrypted.

Applying it 26 times has to be twice as good. Has to be!

Re:FP (-1, Flamebait)

Anonymous Coward | more than 10 years ago | (#5781948)

It's probably bad form to be FPer to one's own review

Its even worse to be a FAILED FPer to one's own review, fool. You suck -- very very badly.

Worst. Whoring. Ever. (1, Funny)

Anonymous Coward | more than 10 years ago | (#5782097)

So you get 3 karma points for submitting an article and THEN in the comments section you add something you "forgot" to include in your review and get modded up +5. How can I get in on this scam?

Re:Worst. Whoring. Ever. (0)

Anonymous Coward | more than 10 years ago | (#5782126)

slurp slurp slurp

speaking of experts (2, Insightful)

Anonymous Coward | more than 10 years ago | (#5782601)

Has Slashdot considered adding a little about the credentials of book reviewers, especially on more technical topics?

I am not in any way passing judgement on "jpetts" here. He, or she, is quite articulate, but could be anywhere from an expert with years of experience to someone who's "read a book or two" and talks a very good game.

Generally I try to assess a writer by coherence and consistency when I don't know the subject material myself. But that only gets one so far - and I usually spot some discrepancies when I do know the subject material.

So the rough outlines of the writer's experience would add (or subtract, as the case may be) a little confidence in their accuracy.

good companion to ac (2, Informative)

Horny Smurf (590916) | more than 10 years ago | (#5781646)

For those of you (including myself) who were expecting an updated version of the Applied Cryptography, this book is NOT it. Based on the pre-publication blurbs here and there, I thought it may be a simple how-to book without too much theory. The book didn't turn out to be that sort of thing either.


This book is, sort of an executive summary of Applied Cryptography (AC), with some updates. It touches upon the insights that Scheneier mentioned in Secret and Lies (like crypto is the easy part and that won't solve security). It mentions some newer material, notably AES related stuff. The description is, in effect, a simplified version of AC. Also, it doesn't try to cover everything, and yes, some explanations about the practical applications are stressed slightly more than in AC.


So if you want to be practical, just go over the essential and latest stuff, this is a good book to read. But I must say that it's not as fun to read as AC. Not as many jokes, and absolutely no crazy stuff (like bio-computing and the significance of dark matters). Oh well, maybe that's what being practical means... But it doesn't give you the feeling of throughness that AC gave. Maybe this comes from my reading AC too much in detail (I actually translated the whole book into Japanese), but I think it is inherent in the book itself. In trying to cover as much ground as possible, the book hurries a lot.


So if you are in a hurry to cover just enough important stuff, get this book. And if you need some explanation on the newer stuff, get this. But I also recommend getting AC as well.

Re:good companion to ac (3, Interesting)

Parsa (525963) | more than 10 years ago | (#5781900)

Good try. I just looked this book up on Amazon.com and this is the only review of the book posted. Great cut and past job.

Re:good companion to ac (0)

Anonymous Coward | more than 10 years ago | (#5782554)

yeah, It's a good book, and I thought other amazon.com shoppers should know what I thought of it.

What they *don't* tell you is (-1, Offtopic)

Yellow Brick Choad (464067) | more than 10 years ago | (#5781650)

that Timothy, Ferguson and Schneier have been in a gay polyamorous triad for the last three and a half years.

thank you, Timothy, for being a slutty faggot shill. truly a Slashdot icon.

I'll tell ya what I think... (4, Funny)

TopShelf (92521) | more than 10 years ago | (#5781652)

Jakb sdf aksvbmk aklsdfj alksjd SjkczLzeq adjskf sdkimz zoikjp ead!

Re:I'll tell ya what I think... (0)

Anonymous Coward | more than 10 years ago | (#5781769)

huh, I think the encription key got lost in mid post. Please resubmit your post with the proper encription key.

Re:I'll tell ya what I think... (1)

AlbanySux (248858) | more than 10 years ago | (#5781854)

What kind of encryption is that?!?! it shoudl either be formatted in blocks of 5 or without spaces.. you are giving away entirely too much information about sentance structure. Its quite apparent you didn't read any of his other books..

Re:I'll tell ya what I think... (0)

Anonymous Coward | more than 10 years ago | (#5782866)

How do you know those spaces indicate spaces in the plain text? They could be a result of the algorithm.

Remember to format the ciphertext, dude (2, Funny)

apankrat (314147) | more than 10 years ago | (#5782219)

> Jakb sdf aksvbmk aklsdfj alksjd SjkczLzeq adjskf sdkimz zoikjp ead!

Jakbs dfaks vbmka klsdf jalks jdSjk czLze qadjs kfsdk imzzo ikjpe adxxx

No (-1, Offtopic)

Anonymous Coward | more than 10 years ago | (#5781654)

If you are interested in crypto, do yourself a favour: buy this book.

No foreigner, I will do myself a favor and buy the book. And don't act like the ritish invented English or something.

But please keep in mind: (4, Funny)

burgburgburg (574866) | more than 10 years ago | (#5781666)

All of this is now officially illegal.
Cryptography supports terrorism.
Reading about implementing cryptography supports terrorism.
Reading reviews about books about implementing cryptography supports terrorism.

Now turn off the computer, stand over there in the corner and we'll be by to pick you up in a little while. And remember, running supports terrorism.

Re:But please keep in mind: (2, Funny)

sapped (208174) | more than 10 years ago | (#5781712)

And remember, running supports terrorism.

No, driving off in your SUV supports terrorism.

Re:But please keep in mind: (1)

warpSpeed (67927) | more than 10 years ago | (#5782620)

No, driving off in your SUV supports terrorism.

What is Jesus is you co-pilot?

Re:But please keep in mind: (2, Funny)

(54)T-Dub (642521) | more than 10 years ago | (#5781726)

Posting a warning to terrorists about their impending arrest is Definitely supporting terrorism.

Re:But please keep in mind: (1)

MAXOMENOS (9802) | more than 10 years ago | (#5782815)

Listing ways that one can support terrorism supports terrorism.

You terrorist!

Practical vs Applied (4, Interesting)

Blaine Hilton (626259) | more than 10 years ago | (#5781675)

I'm glad to see a book on practical cryptography. I like reading about the theory behind how things work, but on the job when I'm working on websites and such I need a reliable way to protect sensitive information and not a bunch of words from theorists.

Hopefully this helps the good guys more then the bad ones though...

Go calculate [webcalc.net] something.

Re:Practical vs Applied (0, Redundant)

CodeMonky (10675) | more than 10 years ago | (#5781740)

Schneir is actually releasing a followup to AC centered around actually using crypto in everyday applications.

He mentioned it in this month Cryptogram.

Re:Practical vs Applied (1)

CodeMonky (10675) | more than 10 years ago | (#5781758)

Here is a link to the actual book:
http://www.counterpane.com/book-practical.h tml

Re:Practical vs Applied (4, Funny)

flynt (248848) | more than 10 years ago | (#5781879)

Schneir is actually releasing a followup to AC centered around actually using crypto in everyday applications. He mentioned it in this month Cryptogram.

In case you hadn't noticed, the Slashdot story you just posted about your comment to is a review of that book.

Re:Practical vs Applied (1)

CodeMonky (10675) | more than 10 years ago | (#5782150)

Laugh.
Woops. Saw Applied Crypto linked in the description and that overroad the title.

Re:Practical vs Applied (5, Insightful)

Anonymous Coward | more than 10 years ago | (#5782023)

I'm sorry, but it is attitudes (and books) like these that give rise to the woeful state of affairs that have existed in "practical cryptography" over the years. Schneier's book, while certainly well-meaning, has promoted the idea that you don't need to understand formal notions of security to be a serious cryptographer. It is hard to overestimate the damage that this idea (and this) book have caused.

Currently, the only way to argue that a cryptosystem is secure is by reducing its security to that a well-studied primitive, like factoring, DLP, even DES! (Of course, it is true that we don't currently know of any explicit intractable problems, but if you are going to use a cryptosystem handed to you on a platter, better to know that its security has an undeniable link to factoring than merely that some group of software engineers somewhere couldn't find a way to break it.)

The point is that there is no "royal road" to cryptography. If you want to be a serious cryptographer, you need to get your hands dirty: understand what a reduction is, learn some complexity theory, learn some computational number theory. Of course, it is fine for end users or businesses to use prepackaged systems if they trust them. The dangerous road is the middle road, where we have "experts" who don't really understand the foundations of the subject.

If you want a laugh, read the description of pseudorandomness in Schneier's book and cf. that of, say, Goldreich's.

Re:Practical vs Applied (2, Interesting)

Crispy Critters (226798) | more than 10 years ago | (#5782456)

I'm sorry, but it is attitudes (and books) like these that give rise to the woeful state of affairs that have existed in "practical cryptography" over the years. Schneier's book, while certainly well-meaning, has promoted the idea that you don't need to understand formal notions of security to be a serious cryptographer. It is hard to overestimate the damage that this idea (and this) book have caused.
I find it astonishing that a book that has only been out a few weeks has caused much damage.

Unless you are thinking of Schneier's first book on cryptography. If you knew what you were talking about, you would know that he wrote Secrets and Lies mainly to explain that crytpographic protocols by themselves don't solve the whole problem. He thought his first book might leave that impression, and he wanted to correct it.

It sounds like you are arguing that this information must be locked up because it is dangerous, and the "serious cryptographer[s]" will then decide who gets access to it and who doesn't. This is disgusting elitism.

Sure, lots of people pass themselves off as experts based on reading a book. The problem is these people and the people who believe them, not the book. Some programmers write buggy code in operating systems. Does this mean that no one should write a book about operating systems to protect us from people who read the book and then write buggy code? Any competent person with training or education knows where the limits to his knowledge are. Anyone who doesn't know this is incompetent, and that can't be blaimed on a book.

Re:Practical vs Applied (1)

eXtro (258933) | more than 10 years ago | (#5783011)

Go read Schneier's web site and learn something. He has a section on how to become a cryptographer. He even gives a self study course in block cypher cryptanalysis [counterpane.com]. He asserts exactly what you do: to become a cryptographer you need to get your hands dirty. He has credentials though. You don't.


These books are like popular science books such as A Brief History of Time, or Cosmos. They're not about making people an expert in a field, they're about helping the layman learn a little bit about a field.

you know, (0, Flamebait)

Cheapoboy (634792) | more than 10 years ago | (#5781682)

Buying this book will probally send out alot of red flags with the D.H.S, what with the patriot act and all...

That's why... (0)

Anonymous Coward | more than 10 years ago | (#5781776)

...I'll be buying it with cash, just like I buy all my other crypto and security books.

Re:you know, (2, Funny)

exhilaration (587191) | more than 10 years ago | (#5782001)

Especially if you're non-white, non-Christian, and of foreign descent.

I too will be paying for this with cash.

Re:you know, (1)

Cheapoboy (634792) | more than 10 years ago | (#5783118)

CHRIST I'M SO FUXX0RD! my great-grandmother was native american! they'll link her to the 60s A.I.M movement and link that to Al Queda! OMFG! on a side note when did the USA become the USSR? I think I missed that memo...

Applied Cryptography (4, Interesting)

msheppard (150231) | more than 10 years ago | (#5781713)

I've always liked the tagline on the back of the Applied Cryptography book:
"The Book the National Security Agency wanted never to be published..."

M@

Older stuff is a must read... (4, Interesting)

(H)elix1 (231155) | more than 10 years ago | (#5781727)

Applied Cryptography is a must read. Few books invoke the proper fear and respect cryptology deserves, with example after example of why your l33t encryption should not be used for anything more valuable than your Slashdot UID. Great examples, solid code, lots of history... If this is even half the book Applied Cryptography was, get your checkbook ready.

Re:Older stuff is a must read... (4, Interesting)

fermion (181285) | more than 10 years ago | (#5782167)

Let me add that though Applied Cryptography is a dauntingly dense book, one can get great benefit from the first hundred pages. The first section of the book develops background material and basic understanding of the issues. To use the authors' physics example, reading a first semester physics book will not teach you physics, but it will teach enough of the science to defend yourself against those who would abuse it.

As the reviewers states, the algorithms have changed over the past several years, but it may be more important to remember that the basic issues have not. People are still trying to pass off obviously flawed protocols as good security measures.

Re:Older stuff is a must read... (1)

ianjk (604032) | more than 10 years ago | (#5782452)

If this is even half the book Applied Cryptography was, get your checkbook ready.

I donno if the checkbook is a good idea. Probably unmarked bills, nonsequential. Mabey have your grandmother go out and buy it.

Too expensive? (4, Insightful)

analog_line (465182) | more than 10 years ago | (#5781768)

Is there anything I didn't like about the book? Frankly, no. Some might complain that it is priced too high (it lists at USD50 for the softcover, and USD70 for the hardcover), but it is printed on acid-free paper, and the density of useful advice is such that it outstrips in value many works which cost half the price or less.

Taking a look at my paperback copy of Applied Cryptography, it's listed at $55, so I hardly consider that any more expensive. And I paid full cover price for this bugger, as opposed to getting it online for a song, like I should have.

I don't think Applied Cryptography had a hardcover edition available, at least of the Second Edition. I certainly may consider picking that thing up. Hopefully it'll be able to stick together for awhile.

And on another note, what isn't printed on acid-free paper these days? Aside from little paperback novels, etc. I thought that was all done away with.

Re:Too expensive? (1)

ssimpson (133662) | more than 10 years ago | (#5781873)

I totally agree - AC2 was well worth the money. FWIW AC2 was available in hardcover - Amazon still sell it at an unpleasant 85USD!

Re:Too expensive? (1)

mttlg (174815) | more than 10 years ago | (#5781881)

Taking a look at my paperback copy of Applied Cryptography, it's listed at $55, so I hardly consider that any more expensive.

Of course, if you compare it to Secrets and Lies, which was sent in duplicate for free to anyone who wanted it, $50-70 (or even $30 for the paperback at Bookpool) is a lot more expensive. But I guess mailing out tons of free books isn't a very good business model these days...

Re:Too expensive? (3, Informative)

eric_ste (446052) | more than 10 years ago | (#5783086)

HAC can be downloaded from here

http://www.cacr.math.uwaterloo.ca/hac/

and many other places.

At the very least... (5, Funny)

Ratphace (667701) | more than 10 years ago | (#5781794)

...you can look forward to your name being recorded with the FBI when you visit the local library to check this book out along with a copy of 'the catcher in the rye'

Re:At the very least... (4, Funny)

jpetts (208163) | more than 10 years ago | (#5781857)

you can look forward to your name being recorded with the FBI when you visit the local library to check this book out along with a copy of 'the catcher in the rye'

Hmmm, maybe the PATRIOT Act is a ploy by authors to make sure we BUY their books (with cash, natch...), instead of checking 'em out from libraries...

Applied Cryptography (5, Funny)

Prof.Phreak (584152) | more than 10 years ago | (#5781812)

His book, Applied Cryptography is widely regarded as the most accessible, and one of the most important books on cryptographic algorithms ever published. "A colleague once told me that the world was full of bad security systems designed by people who read Applied Cryptography" - Bruce Schneier (author of Applied Cryptography). Quote from Secrets & Lies.

Re:Applied Cryptography (1)

Crispy Critters (226798) | more than 10 years ago | (#5782487)

A colleague once told me that the world was full of bad security systems designed by people who read Applied Cryptography" - Bruce Schneier (author of Applied Cryptography). Quote from Secrets & Lies.
I am regularly asked what the average Internet user can do to ensure his security. My first answer is usually "Nothing; you're screwed." - Bruce Schneier

Accessible? (4, Funny)

Bingo Foo (179380) | more than 10 years ago | (#5781871)

Calling the book "accessible" is hardly a compliment for a book on crypography, isnt' it?

I'd rather see a review like: "This book was so impenetrable that teams of scientists in academia and the NSA, working with the online computing grid will take many times the age of the universe to understand the first chapter alone."

Acid-free paper? (3, Funny)

cperciva (102828) | more than 10 years ago | (#5781887)

I'm really glad this is printed on acid-free paper. Because, you know, I'm really likely to be wanting to read this book fifty years from now.

Before you worry about finding a storage medium which will survive for a long time, think about how long the information you're storing will be useful.

Re:Acid-free paper? (1)

Ageless (10680) | more than 10 years ago | (#5782019)

Well, RSA, one of the algorithms presented in this book is now about 20 years old and is still as, if not more, important today than it was 20 years ago. It's no 50 years but I bet we'll still be using RSA in another 10.

Re:Acid-free paper? (1)

hardburn (141468) | more than 10 years ago | (#5782593)

Depends on if Quantum Computers become practical in that timeframe. If they do, RSA (and a lot of other crypto algorithms) become useless.

On a somewhat related note, (1, Insightful)

Anonymous Coward | more than 10 years ago | (#5781904)

I wish that the bignum libraries were a little more straightforward. For example, lots of cryptographic algorithms involve enormous numbers like 1024 bit primes and so forth. But I think libcrypto's bn_* function family is something like 4000 lines of code, and GMP is enormous too. For secure applications, I want to be able to understand and audit the entire library, so I wish they were written for readability instead of speed or whatever they're currently going for. The encryption protocol is useless if there is an overflow on line 8 billion of some underlying library.

Re:On a somewhat related note, (1)

Prof.Phreak (584152) | more than 10 years ago | (#5782163)

Readability of such things often sacrifices speed. Ie: multiplication can be done in like maybe 7 or so lines of C, yet if you use FFT the code (& its speed) increases.

A very good straight forward implementation of most basic algorithms (addition, subtraction, multiplication, division) can be found in BigInteger class in Java source code (one that comes with the SDK). Basically they took word-for-word what's in the Knuth's The Art of Computer Programming Vol. 2, and implemented it in Java.

Re:On a somewhat related note, (0)

Anonymous Coward | more than 10 years ago | (#5782956)

There's no reason obscure code can't be commented properly, though. That would enhance readability without sacrificing speed.

Re:On a somewhat related note, (2, Insightful)

nestler (201193) | more than 10 years ago | (#5782211)

I think it is somewhat unreasonable to expect a big number (BN) library to be completely transparent on a casual reading. Public key (BN) operations in software are very slow. The OpenSSL implementation uses every optimisation it can to speed up its BN operations, just like compiler writers do everything they can to optimize the compiler output.

Did you write your own compiler? No, well have you read every line of gcc? Especially all of the complicated optimizer that makes the binary run faster? Even if you wrote a very dumb BN library that was easier to read, you would still have to worry about an "overflow on line 8 billion of some underlying library" (your compiler in this case).

I agree that OpenSSL's BN library could be better documented internally, but I don't think they should unoptimize it for clarity. People want transparent crypto, meaning they don't like experiencing 100-fold slowdowns when they add crypto to their application. BN optimization is critical in minimizing this slowdown (CRT, Montgomery reduction, sliding windows, Karatsuba, etc.).

Re:On a somewhat related note, (0)

Anonymous Coward | more than 10 years ago | (#5782323)

Thanks for the thoughtful reply, but I still disagree. How value of the optimizations has decreased and will continue to decrease as computers become faster. If you like, you can think about writing obvious code as optimizing in terms of the amount of time it takes a human to understand it. If in 10 years my obvious code takes N time (N being some time so short that it is negligible to humans) it won't matter that the optimized code takes one tenth of N.

Re:On a somewhat related note, (1)

Prof.Phreak (584152) | more than 10 years ago | (#5782407)

If in 10 years...

A lot of things can happen in 10 years...

Also those are not some "temporary" optimizations. There are simply better (but more complex) methods of doing numerical things - so in 10 years, they'll still be faster.

AND, people will always find better uses for CPU power IF it is available (if you don't use it up by bloated code).

Can you say ray-traced true-live-movie-quality DOOM 7? (I'm sure that can bring down to its knees any computer we can come up with in the next 10 years).

Re:On a somewhat related note, (0)

Anonymous Coward | more than 10 years ago | (#5782413)

And by "How value", I mean "The value". Cough. Coffee.

Definitive Crypto Books... (3, Informative)

ssimpson (133662) | more than 10 years ago | (#5781955)

I can't comment on Practical Cryptography as Wiley haven't yet shipped my pre-ordered copy of the book, grumble.....

BUT I can recommed 2 books that any person interested in implementing cryptography should have on their shelf:

  • Handbook of Applied Cryptography [amazon.com] by Menezes et al. Very much like Applied Cryptography 2nd Ed but far more rigorous.
  • Security Engineering [amazon.com] by Ross Andreson - an excellent treatment on why cryptographic and security systems fail in the real world.

I like the joke at the bottom of the X.509 link (4, Funny)

ralico (446325) | more than 10 years ago | (#5782055)

At the bottom of the X.509 certificates link [auckland.ac.nz]

An engineer, a chemist, and a standards designer are stranded on a desert island with absolutely nothing on it. One of them finds a can of spam washed up by the waves.

The engineer says "Taking the strength of the seams into account, we can calculate that bashing it against a rock with a given force will open it up without destroying the contents".

The chemist says "Taking the type of metal the can is made of into account, we can calculate that further immersion in salt water will corrode it enough to allow it to be easily opened after a day".

The standards designer gives the other two a condescending look, gazes into the middle distance, and begins "Assuming we have an electric can opener...".

Re:I like the joke at the bottom of the X.509 link (0)

Anonymous Coward | more than 10 years ago | (#5783177)

Odd, I thought Spam had a pull tab.

I've always thought... (4, Funny)

mattsucks (541950) | more than 10 years ago | (#5782109)

A bit OT, but I've always thought it would be intersting to see a cryptology book released in electronic form .... encrypted. Kind of a "you must be at least this tall to ride this ride" kind of thing.

Thta book isn't entirely necessary... (0)

alchemist68 (550641) | more than 10 years ago | (#5782152)

in today's world, which is primarily occupied by Micro$oft zombies. Why, I can encrypt my documents manually, employ a random encryption algorythm, and read them [with my eyes] even while encrypted! Take a look here:

!dAOl Si gNiLWoH EhT HO !sTHgIN eTiLNoOm No TNeMeC DLoC eNoTs eHt tSnIAgA lAEnYObwOc SEpaR OCaTRdMc

To the average Borg drone, this looks like M$ Windows just before a fatal crash, and quite possibly THE BLUE SCREEN OF DEATH! Hence, the drone will quickly exit the document, save as many other open documents, and restart the computer.

Re:Thta book isn't entirely necessary... (0)

Anonymous Coward | more than 10 years ago | (#5782641)

Wow, apparently this isn't only a Microsoft junkie problem - I read your post from both Solaris and MacOS and have no idea WTF you're talking about.

Even the lines that appear to be plain text have no apparent meaning!

Re:Thta book isn't entirely necessary... (0)

Anonymous Coward | more than 10 years ago | (#5782880)

It's written backwards using a random mix of upper and lower case letters. How clever!

There is a message about some action being taken by CmdrTaco against CowboyNeal on moonlite nights.

Re:Thta book isn't entirely necessary... (0)

Anonymous Coward | more than 10 years ago | (#5782910)

It's written backwards using a random mix of upper and lower case letters. How clever!

There is a message about some action being taken by CmdrTaco against CowboyNeal on moonlite nights.

Re:Thta book isn't entirely necessary... (1)

charlieo88 (658362) | more than 10 years ago | (#5783010)

!dAOl Si gNiLWoH EhT
^^^^

Back to the drawing board for you. Seems your encryption doesn't maintain data integrity.

Re:Thta book isn't entirely necessary... (1)

alchemist68 (550641) | more than 10 years ago | (#5783143)

In keeping with the Slasdot tradition, and to approximately half of our readership, I mis-spelled "loud" as "load". "A" is still a vowel like "u"; some would argue it depends on the usage.

decrypt this and you shall learn something my son! (-1)

Anonymous Coward | more than 10 years ago | (#5782212)

ad44f5bd 8c350b2d

|| ||

(xl) (xr)

key = blowfish is cool
key length = 16
encryption algorithm = blowfish 16 rounds

Re:decrypt this and you shall learn something my s (0)

Anonymous Coward | more than 10 years ago | (#5782291)

should be

1f7301f3 and 4fddfb54

it is worth it ...

What about HAC? (5, Informative)

mh_cryptonomicon (608940) | more than 10 years ago | (#5782217)

Applied Crypto is certainly a quality, wide-ranging tome on crypto. For years though, there have been a couple very good books with more implementation details. The Handbook of Applied Crypto from Menezes, et al comes immediately to mind. Either of the two books by Neal Koblitz are excellent. I also like to recommend Decrypted Secrets from Bauer. The Handbook of Applied Crypto is available as a free download from the author's site:

Book Review, Reprint (0, Funny)

drgroove (631550) | more than 10 years ago | (#5782544)

(Using md5() ... )

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c6e76a72f258857bed843acfbd216ae5 21582c6c30be1217322cdb9aebaf4a59 cc935c5faf4c8f7a0468d7552a9b8138 23f9c1b08ef269ebf4b403ed833a5b03 336d5ebc5436534e61d16e63ddfca327 a2d4bfc626b142774660d5deb9a7f0a7 7d0db380a5b95a8ba1da0bca241abda1 8451fc653eaa269664a6d9b46a238424 336d5ebc5436534e61d16e63ddfca327 e0d00b9f337d357c6faa2f8ceae4a60d f0441366488bd123be0e5fb7d6c03c2b 910955a907e739b81ec8855763108a29 4ab8710d781ba5b13aaf561cafd896b7 ca97d7fcd88d424065b3fb8b1b63495b 6dbdba779ddf6dd053c3785e6bd9d035 9e925e9341b490bfd3b4c4ca3b0c1ef2 a77b3598941cb803eac0fcdafe44fac9 f97c5d29941bfb1b2fdab0874906ab82 8bf8854bebe108183caeb845c7676ae4 8fc42c6ddf9966db3b09e84365034357 addec426932e71323700afa1911f8f1c f3e9e0675feca77f67a7e32898b75dc2 8d8a1b73876ca678cc3afa372e5199de 13b5bfe96f3e2fe411c9f66f4a582adf 8fc42c6ddf9966db3b09e84365034357 e91e6348157868de9dd8b25c81aebfb9 9176a98110716496410503c80b9d1af5 39e61d57e9209611edd4f884e9e47c11 9e925e9341b490bfd3b4c4ca3b0c1ef2 e23ee923e08a2bceae9b0e0d2d3eba80 65b50b04a6af50bb2f174db30a8c6dad ff0cb426c0698739bc5e410313a00f7e 2c843f3bf026929da412897f5c9e7b8e 41a23ff0e62bc39c571d717b71cc6d54 53d8f4d1e2b5be0d0abfde443f017359 f970e2767d0cfe75876ea857f92e319b 0cc175b9c0f1b6a831c399e269772661 6ce207e8f7bc1afc40ba5e1d8a181478 e91e6348157868de9dd8b25c81aebfb9 ff0cb426c0698739bc5e410313a00f7e 7c67f7869117923c58b29eee5f760c5f 7761127a460aaf290ed953098284dd1a 791b0c20a65a95dc903f4928be58156c 01b6e20344b68835c5ed1ddedf20d531 1818d506396d77b3d035f719885c4cd1 26eb20e01947f0cc7bbc2cdb458a499b ed2b5c0139cec8ad2873829dc1117d50 c48d7856c321faa3bf30956cfff0217a 77631ca4f0e08419b70726a447333ab6 1e3057527650f36abc8cfa0131920cda a77b3598941cb803eac0fcdafe44fac9 07ccfe360dce69b84595428e2ec1c1cc 17b9b0dd34a74166f3b3c4b11fc1bd8e 13b5bfe96f3e2fe411c9f66f4a582adf 65b50b04a6af50bb2f174db30a8c6dad e16704d9e243b23b4f4e557748d6eef6 8bf8854bebe108183caeb845c7676ae4 ffb85bfe93f1d2f1654a7048b87f0403 be5d5d37542d75f93a87094459f76678 b8b1ddae9aafe82ed29b973cf9f0b031 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Re:Book Review, Reprint (0)

Anonymous Coward | more than 10 years ago | (#5782695)

How could you mod this down as Troll?! This is freakin hilarious! I guess one man's humor is another man's troll... :\

My new fangled encryption scheme (0)

Anonymous Coward | more than 10 years ago | (#5782546)

OK. Here is a challange.

My crypto algorithm is to take an arbitary irrational number(t), and a large number(z) as a secure key(this is symmetrical encryption, not public key). Then use the decimal expansion of t starting at position z as a one time pad for your message(M).

To decrypt the result(R) to retriev M, you need to know the key (t,z). eg. (t,z) might be (sqrt(2),1127304).

Anyone care to crack my encryption scheme?

Bonus points for readers if some people post messages encrypted with this scheme, with the key kept secret. And then see if anyone can break the encryption scheme and reveal the message M (without knowing the key).

My understanding is that this is possible, but I am only half convinced. Someone prove it for me.

Thanks.

I'm weak in cryptography (0)

Anonymous Coward | more than 10 years ago | (#5782827)

but it sounds to me like you're proposing OTP with a weird way of generating the pad. So instead of saying t and z are needed to decrypt the message, I believe it would be fine to say that the pad is needed to decrypt the message. Well, yeah -- it's OTP so you need the pad. t and z are just a handy way of generating the pad any time you want it. You could just as easily use pi or e or whatever. I'm not certain, but I believe the pad should be derived from a source we consider to be truly random, not some function.

Re:My new fangled encryption scheme (2, Interesting)

barfy (256323) | more than 10 years ago | (#5782846)

With at least your sample key, it is very easy to brute force this, I only have to try slightly over 1 million keys.

There are two problems with this, first is the relatively small number of Irrational numbers that are likely to be used (unless there is a large and easy to mine font of these I am not aware of).

The source of security of most encryption systems is that the "random streams" created by the initial key are extraordinarially large.

Changing the starting point in 1 given or even a handful of given streams, leaves you open to a simple sliding window against a previously stored length of strings.

It would become every more problematic the bigger the number Z (yours example would be trivially easy).

With a LARGE z it would take your encryption program a long time to get there (Except for PI), and the decryptor would also have a long time to get to the starting position.

Most professional decryptors are going to have most of the stream prestored, unless z is REALLY BIG).

I suspect that you can use really large Z numbers with t = PI and it would take a long time to brute force your answer. (This would be from the algorithm that lets you calculate any given position of PI).

Better choices for t. (0)

Anonymous Coward | more than 10 years ago | (#5783082)

I chose a very poor example of t. In practise, t can cover a huge range of numbers. There is no shortage of methods of producing irrational numbers from rational numbers. eg e^a, sin(a), tan(a), sqrt(a), cubert(a) etc. With a being things like 1012758, or 2.3145753 or whatever.

I am probably wrong, but it feels like there would be too many t's and z's to chose from for it to be brute forceable. But another part of my intuition says I know jack shit about encryption and am 99.999% sure my method is easily breakable.

Since everyone is posting their favorite books... (4, Interesting)

c64cryptoboy (310001) | more than 10 years ago | (#5782627)

Check out reviews of LOTS of cryptography books here [youdzone.com] -- most with an associated set of prerequisite book reading, math, and computer language skills.

another book on cryptology (3, Interesting)

roalt (534265) | more than 10 years ago | (#5782697)

One of the best (and accessible) books I've read about cryptology (from hieroglyphs to quantum computing) is The Code Book [amazon.com] by Simon Singh

It's fun reading!

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