![]() The number of invertible matrices modulo 26 is the product of those two numbers. ![]() computing hardware and software, and data encryption. The cipher can, of course, be adapted to an alphabet with any number of letters all arithmetic just needs to be done modulo the number of letters instead of modulo 26.Ĭonsider the message 'ACT', and the key below (or GYB /NQK /URP in letters): SENDING AND SECURING TEXT MESSAGES USING CAESAR CIPHER BY AKERELE KEHINDE OMOLADE SO4/COM/2013/071. The matrix used for encryption is the cipher key, and it should be chosen randomly from the set of invertible n × n matrices ( modulo 26). To decrypt the message, each block is multiplied by the inverse of the matrix used for encryption. To encrypt a message, each block of n letters (considered as an n-component vector) is multiplied by an invertible n × n matrix, against modulus 26. Though this is not an essential feature of the cipher, this simple scheme is often used: ![]() Each letter is represented by a number modulo 26.
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