A HYBRID CRYPTOSYSTEM USING VARIABLE LENGTH SUB KEY GROUPS AND BYTE SUBSTITUTION
Adi Narayana Reddy Kaipa, Vishnu Vardhan Bulusu, Ramakrishna Reddy Koduru and Durga Prasad Kavati
DOI : 10.3844/jcssp.2014.251.254
Journal of Computer Science
Volume 10, Issue 2
Hill cipher is developed using simple linear transformation. It is vulnerable to known-plaintext attack and there exist several methods in the direction of linear transformation to overcome the problems. HCM-EE is an improved method using Eigen value but it is linear and too many mathematical operations. In this study an attempt has been made to introduce nonlinearity to the linear transformation based cryptosystem using byte substitution over GF (28) and a variable length sub key groups. The performance evaluation of the method is also studied and presented.
© 2014 Adi Narayana Reddy Kaipa, Vishnu Vardhan Bulusu, Ramakrishna Reddy Koduru and Durga Prasad Kavati. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.