Applied Cryptography, Second Edition: Protocols, Algorithms And Source Code In C 9780471117094 下载 pdf 百度网盘 epub 免费 2025 电子书 mobi 在线

　　". . .the best introduction to cryptography I′ve ever seen. .

. . The book the National Security Agency wanted never to be

published. . . ." –Wired Magazine". . .monumental . . . fascinating

. . . comprehensive . . . the definitive work on cryptography for

computer programmers . . ." –Dr. Dobb′s Journal". . .easily ranks

as one of the most authoritative in its field." –PC Magazine". .

.the bible of code hackers." –The Millennium Whole Earth

CatalogThis new edition of the cryptography classic provides you

with a comprehensive survey of modern cryptography. The book

details how programmers and electronic communications professionals

can use cryptography–the technique of enciphering and deciphering

messages–to maintain the privacy of computer data. It describes

dozens of cryptography algorithms, gives practical advice on how to

implement them into cryptographic software, and shows how they can

be used to solve security problems. Covering the latest

developments in practical cryptographic techniques, this new

edition shows programmers who design computer applications,

networks, and storage systems how they can build security into

their software and systems.What′s new in the Second Edition?? New

information on the Clipper Chip, including ways to defeat the key

escrow mechanism? New encryption algorithms, including algorithms

from the former Soviet Union and South Africa, and the RC4 stream

cipher? The latest protocols for digital signatures,

authentication, secure elections, digital cash, and more? More

detailed information on key management and cryptographic

implementations

Partial table of contents:

CRYPTOGRAPHIC PROTOCOLS.

Protocol Building Blocks.

Basic Protocols.

Intermediate Protocols.

Advanced Protocols.

Esoteric Protocols.

CRYPTOGRAPHIC TECHNIQUES.

Key Length.

Key Management.

Algorithm Types and Modes.

Using Algorithms.

CRYPTOGRAPHIC ALGORITHMS.

Data Encryption Standard (DES).

Other Block Ciphers.

Other Stream Ciphers and Real Random-Sequence Generators.

Public-Key Algorithms.

Special Algorithms for Protocols.

THE REAL WORLD.

Example Implementations.

Politics.

　　BRUCE SCHNEIER is President of Counter-pane Systems, a consulting firm specializing in cryptography and computer security. He is a contributing editor to Dr. Dobb's Journal, serves on the board of directors of the International Association of Cryptologic Research, and is a member of the Advisory Board for the Electronic Privacy Information Center. He is the author of E-Mail Security (Wiley) and is a frequent lecturer on cryptography, computer security, and privacy.

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如果同一个算法既用做加密又用做数字签名，就有可能受到攻击［506］。在这些情况中，数字签名操作是加密操作的逆过程：VX=EX，并且SX=DX。

假设Mallory是持有自己公开密钥和私人密钥的系统合法用户。让我们看看他怎么读Bob的邮件。首先他将Alice在（1）中发送给Bob的消息记录下来，在以后的某个时间，他将那个消息发送给Bob，声称消息是从Mallory来的。Bob认为是从Mallory来的合法消息，于是就用私人密钥解密，然后用Mallory的公开密钥解密来验证Mallory的签名，那么得到的消息纯粹是乱七八糟的消息：EM（DB（EB（DA（M））））=EM（DA（M））

即使这样，Bob继续执行协议，并且将收据发送给Mallory：

EM（DB（EM（DA（M））））

现在Mallory所要做的就是用他的私人密钥对消息解密，用Bob的公开密钥加密，再用自己的私人密钥解密，并用Alice的公开密钥加密。哇！Mallory就获得了所要的消息M。

506. J.D. Dixon. "Factorizon and Primality Tests." American Mathematical Monthly. v. 91, n. 6 1984, pp. 333-352.

用完全盲签名协议，Alice能让Bob签署任何东西：“Bob欠Alice100万美元，”“Bob欠Alice的头生子，”“Bob欠Alice一袋软糖，”可能的事远远不止于此。这个协议在许多场合都无用。

然而，有一个办法可以让Bob知道他在签什么，同时仍保持盲签名的有用性质。这个协议的核心是分割选择技术。考虑一个例子，每天很多人进入这个国家，而移民局要确信他们没有走私可卡因。官员可以搜查每一个人，但他们换用了一种概率解决办法。他们检查入境人中的1/10。10个人中有1个人的行李被检查，其余的9个畅通无阻。长期的走私犯会在大多数时间里逍遥法外，但他们有10％的机会被抓住。并且如果法院制度有效，则抓住一次的处罚将远远超出其他9次所得到的。

一组反间谍人员，他们的身份是秘密的，甚至反间谍机构也不知道他们是谁。这个机构的头子想给每个特工一份签名的文件，文件上写有：“这个签名文件的持有人（这里插入特工的化名）享有完全的外交豁免权。”所有的特工有他们自己的化名名单，故这个机构不能仅仅是分发签名文件。特工不想把他们的化名送给所属机构、敌方或者已经破坏了这个机构的计算机。另一方面，机构也不想盲目地签特工送来的文件。聪明的特工可能会代之一条消息，如“特工（名字）已经退休并获得每年100万美元的养老金。签名：总统先生”。在这种情况下，盲签名可能是有用的。假设所有特工都有10个可能的化名，这些化名都是他们自己选的，别人不知道。同时假设特工并不关心他们将在哪个化名下得到外交豁免权。再假设这个机构的计算机是情报局大型情报计算机ALICE，我们的特定代理部门是波哥大行动局（BOB）。

（1）BOB准备了n份文件，每一个使用不同的化名，并给予那个特工外交豁免权。

（2）BOB用不同的盲因子隐蔽每个文件。

（3）BOB把这n份隐蔽好的文件发送给ALICE。

（4）ALICE随机选择n-1份文件并向BOB索要...

If I take a letter, lock it in a safe somewhere in New York, then tell you to read the letter, that's not security. That's obscurity. On the other hand, if I take a letter and lock it in a safe, and give you the safe along with the design specifications of the safe and a hundred identical safes with their combinations so that you and the world's best safecrackers can study the locking mechanism - and you still can't open the safe and read the letter - that's security.

And don't forget Kerchhoffs' assumption: If the strength of your new cryptosystem relies on the fact that the attackers does not know the algorithm's inner workings, you're sunk. If you believe that keeping the algorithm's insides secret improves the security of your cryptosystem more than letting the academic community analyze it, you're wrong. And if you think someone won't disassemble your code and reverse-engineer your algorithm, you're naive. The best algorithms we have are the ones that have been made public, have been attacked by world's best cryptographers for years, and are still unbreakable.

There are many cryptographic algorithms. These are three of the most common:

- DES (Data Encryption Standard) is the most popular computer encryption algorithm. DES is a U.S. and international standard. It is a symmetric algorithm; the same key is used for encryption and decryption.

- RSA (named for its creators - Rivest, Shamir, and Adleman) is the most popular public-key algorithm. It can be used for both encryption and digital signatures.

- DSA (Digital Signature Algorithm, used as part of the Digital Signature Standard) is another public-key algorithm. It cannot be used for encryption, but only for digital signatures.

Random-number generators are not random because they don't have to be. Most simple applications, like computer games, need so few random numbers that they hardly notice. However, cryptography is extremely sensitive to the properties of random-number generators.

...

Of course, it is impossible to produce something truly random on a computer. Donald Knuth quotes John von Neumann as saying: "Anyone who considers arithmetical methods of producing random digits is, of course, in a state of sin".

...

The best a computer can produce is a pseudo-random-sequence generator.

...

For our purposes, a sequence generator is pseudo-random if it has this property:

1. It looks random. This means that it passes all the statistical tests of randomness that we can find.

...

For a sequence to be crypto...

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　　"Overall, I enjoyed this book and its contribution to the

field of transplantation. Many clinicians would find this helpful

in their daily practice." (Doody′s, 16 December 2011)

书籍介绍

. . .the best introduction to cryptography I've ever seen. . . . The book the National Security Agency wanted never to be published. . . . -Wired Magazine

". . .monumental . . . fascinating . . . comprehensive . . . the definitive work on cryptography for computer programmers . . ." -Dr. Dobb's Journal

". . .easily ranks as one of the most authoritative in its field." -PC Magazine

". . .the bible of code hackers." -The Millennium Whole Earth Catalog

This new edition of the cryptography classic provides you with a comprehensive survey of modern cryptography. The book details how programmers and electronic communications professionals can use cryptography-the technique of enciphering and deciphering messages-to maintain the privacy of computer data. It describes dozens of cryptography algorithms, gives practical advice on how to implement them into cryptographic software, and shows how they can be used to solve security problems. Covering the latest developments in practical cryptographic techniques, this new edition shows programmers who design computer applications, networks, and storage systems how they can build security into their software and systems.

What's new in the Second Edition?

* New information on the Clipper Chip, including ways to defeat the key escrow mechanism

* New encryption algorithms, including algorithms from the former Soviet Union and South Africa, and the RC4 stream cipher

* The latest protocols for digital signatures, authentication, secure elections, digital cash, and more

* More detailed information on key management and cryptographic implementations