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Title:
A Combinatorial Analysis of HC-128
Authors: Goutam Paul, Subhamoy Maitra, Shashwat Raizada
Abstract: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^{42} 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. We also suggest a modification to HC-128 that takes care of the recently known cryptanalytic results with little reduction in speed.
ePrint: https://eprint.iacr.org/2010/387
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