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use letters to represent digits "a captured German revealed under interrogation that Enigma operators had been instructed to encode numbers by spelling them out ... Alan Turing reviewed decrypted messages and determined that the number "eins" ("one") was the most common string in the plaintext." -- Wikipedia: known-plaintext_attack "The Enigma machine ...


What is meant by vectors here? Just the inputs and outputs of the function. The function $f$ takes, as input, a sequence of bits (for example, 1010), and returns a sequence of bits (for example, 1100); the text refers to such a sequence of bits as a vector Can someone explain this? Consider a function f that is made up of two operations: Take ...

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