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Considering the specific case of encrypting messages in English (i.e.

m = 26), there are a total of 286 non-trivial affine ciphers, not counting the 26 trivial Caesar ciphers.

Atbash is an ancient encryption system created in the Middle East. The Atbash cipher is a simple substitution cipher that relies on transposing all the letters in the alphabet such that the resulting alphabet is backwards.

The first letter is replaced with the last letter, the second with the second-last, and so on.

Hence without the restriction on a decryption might not be possible.

The transformation can be represented by aligning two alphabets, the cipher alphabet is the plain alphabet rotated left or right by some number of positions.Plaintext: The decryption function is where a - 1 is the modular multiplicative inverse of a modulo m.I.e., it satisfies the equation The multiplicative inverse of a only exists if a and m are coprime.The plaintext is then broken into segments of size E and the letters within that segment are permuted according to this key.In theory, any transposition cipher can be viewed as a permutation cipher where E is equal to the length of the plaintext; this is too cumbersome a generalisation to use in actual practice, however.

(Like domofon ) But it only generates soviet houses mostly a 5 story like in periphery where people drinks vodka. I would be very interested about opinions about that formula and pictures. While the captain and pilot are somewhat insane pilot definitely has a deeper background. Pilot is the diabolical one(reminds be a bit of golem.)And captain is zee captain. AC #2And then, a song started to flow over the wasteland...

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