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Additional info for New Encryption Technologies for Communications Designers
Example text
The public key is distributed widely, so anyone can use it to encipher a message which presumably can only be deciphered by the hidden private key on the other end. Note that the enciphering end normally does not possess a key which will decipher a message which was just enciphered. The whole scheme of course depends upon the idea that the private key cannot be developed from knowledge of the public key. The cipher also must resist both known-plaintext and defined-plaintext attack (since anyone can generate any amount of plaintext and encipher it).
Later, typically a list of transformations from names, polygraphic syllables, and monographic letters, to numbers. Usually the monographic transformations had multiple or homophonic alternatives for frequently-used letters. Generally smaller than a codebook, due to the use of the syllables instead of a comprehensive list of phrases. A sort of early manual cipher with some characteristics of a code, that operated like a codebook. " Also see: ordinal, and interval. Nonlinearity The extent to which a function is not linear.
The Realized One Time Pad: a really random source produces values which are combined with data to produce ciphertext. But because we can neither assume nor prove perfect, theoretical-class randomness in any real generator, this cipher does not have the mathematical proof of the theoretical system. Thus, a realized one time pad is NOT proven unbreakable, although it may in fact be unbreakable in practice. In this sense, it is much like other realized ciphers. A realized one time pad (OTP) is essentially a stream cipher with a really random confusion sequence used exactly once.
