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Study of the Hill Cipher Encryption/Decryption Algorithm
POLYTECHNIC UNIV OF PUERTO RICO SAN JUAN
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The Hill Cypher was Invented by Lester S. Hill in 1929, it was the first polygraphic cipher in which it was practical though barely to operate on more than three symbols at once. As stated before, the Hill Cipher is an encryption algorithm that uses polygraphic substitution ciphers based on linear algebra concepts. Each letter is encoded as a number. In the case of the English alphabet, letters are usually represented by the following scheme A 0, B1, C2 Z25. The message that is to be encrypteddecrypted will be held in a block of n letters and multiplied by a square matrix using modulo of the amount of letters in the alphabet in use. In this research project, the main goal is to recreate this cipher using the values of the ASCII table. Since the Hill Cipher works by assigning a numeric value to the characters that are to be used, using the ASCII table seems like a perfect fit for this application.
APPROVED FOR PUBLIC RELEASE