Password replacement, also known as transposition cipher. Replacement is just a simple transposition. Each permutation can be represented by a permutation matrix. Each exchange has a corresponding inverse permutation. Replacement of the password feature is only one sender and receiver know the encryption permutation (for encryption) and the corresponding inverse permutation (for decryption). It is a long letter of the plaintext letters in the group re-arranged location, and each letter in itself does not change.

zhihuanjiami.txt

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