ISSN: 2229-371X

All submissions of the EM system will be redirected to Online Manuscript Submission System. Authors are requested to submit articles directly to Online Manuscript Submission System of respective journal.

Research Article Open Access

ENHANCEMENT OF RC6 (RC6_EN) BLOCK CIPHER ALGORITHM AND COMPARISON WITH RC5 & RC6

Abstract

In this paper, we present an enhanced version of RC6 Block Cipher Algorithm (RC6_En – RC6 enhanced version), which is a symmetric encryption algorithm [1] designed for 256-bit plain text block. RC6 uses four (w-bit) registers for storing plain text and for data-dependent rotations [2, 3], but this enhanced version (RC6_En) uses eight (w-bit) register that helps to increase the performance as well as improve security. Its salient feature includes two-variable algebraic expression modulo 2w and 2 Box-Type operations, Box-Type I & Box-Type II. Each Box-Type operation uses two (w-bit) registers. Box-Type I works much like two registers (A & B or C & D) operation in RC6 but in Box-Type II bitwise exclusive-or is swapped by integer addition modulo 2w used in Box-Type I and vice-versa, it improves Diffusion in each round. This enhanced version needs 2r+4 additive round-keys and uses every round-key twice for encrypting the file. This enhanced version performs better with respect to RC5[4, 5] and RC6[2, 3] when file size is larger.

Vikas Tyagi, Shrinivas Singh

To read the full article Download Full Article