Details

In order for an encrypted message to be decipherable, the encryption value must be a unit modulo 26, and in this case, the decryption value is its multiplicative inverse. Obviously, an encryption value of 1 is not used. Like the Caesar and other shift ciphers, the decimation cipher is a simple substitution cipher.

This Demonstration includes nine messages to illustrate decimation encryption. Selecting the decryption mode will give a random choice from a list of twelve messages distinct from the nine messages for encrypting. You can opt to decrypt an encrypted version of one of the nine original messages.

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