Classic Ciphers in .NET

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Classic Ciphers
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You are in a maze of twisty little passages, all alike. - Adventure
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Introduction
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Most of this chapter is devoted to introducing terminology and discussing a select few classic pen and paper ciphers. Our goal here is not to cover classical cryptography in detail, since there are already many excellent sources of information on such ciphers. For example, Kahn s history [74] has a general discussion of virtually every cipher developed prior to its original publication date of 1967, Barr [7] presents a readable introduction to cryptography, Spillman [139] nicely covers the cryptanalysis of several classic cipher systems and Bauer [8]provides rigorous coverage of a large number of classical crypto topics. The ciphers we discuss in this chapter have been selected t o illustrate a few important points that arise in upcoming chapters. Even if you are familiar with classical cryptosystems, you should read the next two sections where terminology is discussed, since the terminology in cryptography is not always consistent. In addition, the material in Sections 1.4.3 and 1.4.4 is directly referenced in upcoming chapters.
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Good Guys and Bad Guys
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In cryptography, it is traditional that Alice and Bob are the good guys who are trying to communicate securely over an insecure channel. We employ Trudy (the intruder ) as our generic bad guy. Some books have a whole cast of bad guys with the name indicating the particular evil activity (Eve, the eavesdropper, for example), but we use Trudy as our all-purpose bad guy . 1
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CLASSIC CIPHERS
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Since this is a cryptanalysis book, we often play the role of Trudy. Trudy is an inherently more interesting character than boring old Alice and Bob, and this is part of what makes cryptanalysis so much more fun than cryptography. Trudy does not have to play by any preconceived set of rules. However, it is important to remember that attacks on real systems are almost certainly illegal, so do not attempt to play Trudy in the real world.
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Terminology
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Oryptology is the art and science of making and breaking secret codes. Cryptology can be subdivided irito cryptography (the art and science of making secret codes) and cryptanalysis (the breaking of secret codes). The secret codes themselves are known as ciphers or cryptosystems. In this book, we are focused on cryptanalysis, but many topics in cryptography naturally arise. It is common practice to use the term cryptography as a synonym for cryptology, and we generally follow this practice. In fact, we often use crypto as shorthand for cryptology, cryptography, cryptanalysis, or any variety of other crypto-related topics. The precise meaning should be clear from the context. The original readable message is the plaintext, while the ciphertext is the unreadable text that results from encrypting the plaintext. Decryption is the inverse process, where the ciphertext is converted into plaintext. A k e y is used to configure a cryptosystem. All classic systems are s y m m e t r i c ciphers, meaning that the same key is used to encrypt as to decrypt. In so-called public k e y cryptography the encryption and decryption keys are different, which means that the encryption key can be be made public, but the decryption key must remain private. We cover public key cryptosystems in s 6 and 7, while all of the remaining chapters--including the remaining sections of this chapter~---deal with symmetric ciphers. Note that decryption is distinct from cryptanalysis, since cryptanalysis implies an attack of some sort has been used to read the messages, while decryption implies that the plaintext has been retrieved using the key by the expectcd process. Of course, if Trudy recovers the key via cryptanalysis, then she can simply decrypt a particular ciphertext. The typical encryption and decryption process is illustrated in Figure 1.1, where Pi is the ith unit of plaintext (which may be a bit, a letter, a word, or a la.rger block, depending on the particular cipher), Ci is the corresponding unit of ciphertext, and the squiggly line represenh the transmission of the ciphertext over an insecure channel. There are several generic types of attacks on ciphers. In a ciphertext only attack, the attacker attempts to recover the key or plaintext from the ciphertext. In particular, in a ciphertext-only attack, the cryptanalyst does
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