A New Modal of Hill Cipher using Non – Quadratic Residues
L. Sreenivasulu Reddy

Dr. L Sreenivasulu Reddy, Department of Computer Science & Engineering, Madanapalle Institute of Technology & Science, P.B.No.14, Angallu, Madanapalle-517325, A.P, India.
Manuscript received on April 15, 2012. | Revised Manuscript received on April 20, 2012. | Manuscript published on May 05, 2012. | PP: 73-74 | Volume-2 Issue-2, May 2012 . | Retrieval Number: B0518032212/2012©BEIESP
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© The Authors. Published By: Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)

Abstract: This paper is improved the security on Hill cipher by using Non-Quadratic residues of a prime number p≥53. In Hill Cipher, a plain text is encrypted using a fixed value ‘26’ during the computation. The paper explains how using Non-Quadratic residues during encryption improves security.

Keywords: Modular arithmetic inverse, inner key, outer key, linear congruence’s, Quadratic residues, Non-Quadratic residues, GL (n, Z).