Proceedings of the 4th international conference on knowledge and innovation in Engineering, Science and Technology
Security Enhancement of Hill Cipher by Using Non-Square Matrix Approach
M. Attique ur Rehman, Hasan Raza and Israr Akhter
The conventional Hill cipher provides less information security due to fixed N N key matrix dimensions. In this paper, a new modified Hill cipher is introduced which provides enhanced security performance than the conventional hill cipher scheme. This enhanced security of the modified Hill cipher is dependent on the non-square N M matrix approach. The N M Hill cipher matrix defuses N plaintext information letters into M cipher text messages.Therefore, the varying M redundant cipher text bestowed more confusion than the conventional Hill cipher. Moreover, the modified technique provides always non-singular matrix while finding its inverse which makes free from the complication of singular matrixes in the conventional Hill cipher scheme.
Keywords: Modified Hill cipher, non-square matrix, enhanced security performance.