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Published in:
2008 | OriginalPaper | Chapter
Analysis of RC4 and Proposal of Additional Layers for Better Security Margin
Authors : Subhamoy Maitra, Goutam Paul
Published in: Progress in Cryptology - INDOCRYPT 2008
Publisher: Springer Berlin Heidelberg
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In this paper, the RC4 Key Scheduling Algorithm (KSA) is theoretically studied to reveal non-uniformity in the expected number of times each value of the permutation is touched by the indices
i
,
j
. Based on our analysis and the results available in the literature regarding the existing weaknesses of RC4, few additional layers over the RC4 KSA and RC4 Pseudo-Random Generation Algorithm (PRGA) are proposed. Analysis of the modified cipher (we call it RC4
+
) shows that this new strategy avoids existing weaknesses of RC4.