The following is the Hill Cipher encryption algorithm program in C++. Hence, we will write the program of the Hill Cipher algorithm in C++, although, it’s very similar to C. We will use C++ to write this algorithm due to the standard template library support. 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. In this cipher, each letter is represented by a number (eg. In the Hill password, each letter is treated as a 26-base number: A0, B1, C2. It is now mostly used in classical cipher teaching and learning. Hill Cipher is a cryptographic algorithm to encrypt and decrypt an alphabetic text. Hill cipher is an alternative cipher that uses the principles of basic matrix theory. In this post, we will discuss the Hill Cipher. There are exceptions and some cipher systems may use slightly more, or fewer, characters when output versus the number that was input. In common parlance, “cipher” is synonymous with “ code“, as they are both a set of steps that encrypt a message however, the concepts are distinct in cryptography, especially classical cryptography.Ĭodes generally substitute different length strings of character in the output, while ciphers generally substitute the same number of characters as are input. To encipher or encode is to convert information into cipher or code. An alternative, less common term is encipherment. In cryptography, a cipher (or cypher) is an algorithm for performing encryption or decryption-a series of well-defined steps that can be followed as a procedure.
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