SECURITY ENHANCEMENT OF HILL CIPHER BY USING NON-SQUARE MATRIX APPROACH
M. Attique ur Rehman, Raza Hasan, Israr Akhter · 2018
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.