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Math Help - general encryption functions / block ciphers

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    general encryption functions / block ciphers

    So I've taken a stab at this question but am not sure if I am taking the right direction...

    (1) The question is: how many possible encryption functions are there for a block cipher with block length 2 with plaintext and ciphertext consisting of sequences of elements from Z/2Z (i.e. a sequence of 1's and 0's).

    So, I'm thinking that the plaintext of block 2 can only have 4 possibilities (0, 0) (0, 1) (1, 0) and (1, 1), and these are also the same possibilities for the ciphertext. There would be 4! = 24 mapping possibilities, and therefore 24 possible encryption functions?
    Last edited by cgi101; October 14th 2008 at 09:36 PM.
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