Generating a random sequence based on PWLCM map applicated to RC4 algorithm

Abstract

Cryptography came into picture as a tool to secure data in storage as well as under transmission. Stream cipher has been very famous for providing data confidentiality for vital communication such that found during the military operation. Various algorithms in existence, the two most important trade-off considered would be security and efficiency. The RC4 is a symmetric stream cipher which has been widely implemented in various applications such that of Mozilla and Microsoft. Recently, the algorithm is known for having a weak key schedule which gives rise to related key attacks and thus drove the algorithm to sideline. In this work, an attempt was made to propose an improved method based on the PWLCM map to generate a random sequence in key scheduling algorithm and to use it in the RC4. The novelty in this approach is the transformation of the RC4 algorithm, into a secret key encryption, with the increase of keyspace and thus improves the secu-rity of the key scheduling and in turn the RC4 algorithm.