The Hill Cipher is a polygraphic substitution cipher based on linear algebra. It encrypts blocks of letters (usually 2 or 3 at a time) using matrix multiplication over modulo 26.

Each letter is represented by a number modulo 26. Often the simple scheme A = 0, B = 1... Z = 25, is used, but this is not an essential feature of the cipher. To encrypt a message, each block of n ...

Abstract: In 1926 and 1927 Lester Hill published three short papers about error detection and he got patent for a “Message Protector” constructed on an error ...

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