Section 2 9 The Hill Cipher
{"Image DocumentName": "The Hill System The Hill Cipher was developed by Lester Hill of Hunter College. It requires the use of a matrix mod 26 that has an inverse.", "Image ImageDescription": "The procedure requires breaking the code up into small segments. If the matrix is nxn, then each segment consists of n letters. If A is the matrix and x is the n letter segment code, then the ciphertext is found by calculating Ax = y. Y is the ciphertext segment. To decipher the text we use the inverse of the matrix A. If we call this inverse B, then By deciphers the code returning x. Note: It is required that the plaintext message have n letters. If it does not have some multiple of n letters, we pad the message with extra characters until it does. Example 22: Encrypt a Message. Example 23: Decrypt a Message\u2026", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}