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Erschienen in:
2011 | OriginalPaper | Buchkapitel
A Theoretical Analysis of the Structure of HC-128
verfasst von : Goutam Paul, Subhamoy Maitra, Shashwat Raizada
Erschienen in: Advances in Information and Computer Security
Verlag: Springer Berlin Heidelberg
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HC-128 is an eSTREAM finalist and no practical attack on this cipher is known. We show that the knowledge of any one of the two internal state arrays of HC-128 along with the knowledge of 2048 keystream words is sufficient to construct the other state array completely in 2
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time complexity. Though our analysis does not lead to any attack on HC-128, it reveals a structural insight into the cipher. In the process, we theoretically establish certain combinatorial properties of HC-128 keystream generation algorithm. Our work may be considered as the first step towards a possible state recovery of HC-128. We also suggest a modification to HC-128 that takes care of the recently known cryptanalytic results with little reduction in speed.