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Codes and Ciphers

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It contains different codes where very applicable to all of you who loves mysteries. I also includes all of my learnings and studies that talks about unfamiliar ideas or codes stuffs. I make it for my own book and I want to share it to all of my co...

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FOUR-SQUARE CIPHER

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от RoseliaPoessy

от RoseliaPoessy

FOUR-SQUARE CIPHER
>> The four-square cipher is a manual symmetric encryption technique.It was invented by the French cryptographer Felix Delastelle.

>> The four-square cipher uses four 5 by 5 (5x5) matrices arranged in a square. Each of the 5 by 5 matrices contains the letters of the alphabet (usually omitting "Q" or putting both "I" and "J" in the same location to reduce the alphabet to fit). In general, the upper-left and lower-right matrices are the "plaintext squares" and each contain a standard alphabet. The upper-right and lower-left squares are the "ciphertext squares" and contain a mixed alphabetic sequence.

The upper-right and lower-left squares are the "ciphertext squares" and contain a mixed alphabetic sequence — К сожалению, это изображение не соответствует нашим правилам. Чтобы продолжить публикацию, пожалуйста, удалите изображение или загрузите другое.

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