Abstract
In this paper we study the GGHN stream cipher presented in CISC 2005. This cipher has been motivated from RC4 with the idea to obtain further speed-up by considering word-oriented keystream output instead of byte-oriented ones. We prove that there exist a large number of short cycles of length equal to the length of the state array used in the cipher. Then towards having a theoretical analysis of GGHN type evolution, we study a randomized model of this cipher. Using Markovian process, we show how this model evolves to all zero state much faster than what is expected in an ideal scenario.
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Banik, S., Maitra, S., Sarkar, S. (2011). On the Evolution of GGHN Cipher. In: Bernstein, D.J., Chatterjee, S. (eds) Progress in Cryptology – INDOCRYPT 2011. INDOCRYPT 2011. Lecture Notes in Computer Science, vol 7107. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-25578-6_15
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DOI: https://doi.org/10.1007/978-3-642-25578-6_15
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-25577-9
Online ISBN: 978-3-642-25578-6
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