TRANSPOLY HILL CIPHER — AN IMPROVEMENT OVER TRADITIONAL HILL CIPHER
Ashish Pandey · International Journal of Advanced Research in Computer Science · 2018
Every encryption technique is based on any one of two facts- substitution or transposition. Sometimes the combination of both techniques is used. A substitution technique is one in which the letters of plaintext are replaced by other letters or by numbers or symbols. The basic concept behind this paper is to improve the strength of Hill cipher, ‘a multiple-letter substitution cipher’ against known plaintext attack. This paper presents a modified approach which is an enhancement over traditional Hill cipher by using symmetric matrix of plaintext letters.