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This is basically a substitution cipher where words are converted to numbers and then those numbers are substituted for new numbers as the encryption step. You'd need to assume the language of plaintext, let's assume it's English. Every time the word "the" occurs in the original text, it will cause the same number to be output to replace it. Using some ...


As CodesInChaos notes in the comments, having more ciphertext–plaintext pairs doesn't help with brute force guessing attacks. Well, that is, except for the minor issue of unicity. Basically, to narrow the results of your brute force attack down to a single key, you do need to have enough ciphertext–plaintext pairs that the length of the known plaintext ...

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