[Resource Topic] 2009/527: An Efficient Adaptive-Deniable-Concurrent Non-malleable Commitment Scheme

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Title:
An Efficient Adaptive-Deniable-Concurrent Non-malleable Commitment Scheme

Authors: Seiko Arita

Abstract:

It is known that composable secure commitments, that is, concurrent non-malleable commitments exist in the plain model, based only on standard assumptions such as the existence of claw-free permutations or even one-way functions. Since being based on the plain model, the deniability of them is trivially satisfied, and especially the latter scheme satisfies also adaptivity, hence it is adaptive-deniable-concurrent non-malleable. However, those schemes cannot be said to be practically efficient. We show a practically efficient (string) adaptive-deniable-concurrent commitment scheme is possible under a global setup model, called global CRS-KR model.

ePrint: https://eprint.iacr.org/2009/527

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