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Erschienen in:
2008 | OriginalPaper | Buchkapitel
Digital Signatures Out of Second-Preimage Resistant Hash Functions
verfasst von : Erik Dahmen, Katsuyuki Okeya, Tsuyoshi Takagi, Camille Vuillaume
Erschienen in: Post-Quantum Cryptography
Verlag: Springer Berlin Heidelberg
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We propose a new construction for Merkle authentication trees which does not require collision resistant hash functions; in contrast with previous constructions that attempted to avoid the dependency on collision resistance, our technique enjoys provable security assuming the well-understood notion of second-preimage resistance. The resulting signature scheme is existentially unforgeable when the underlying hash function is second-preimage resistant, yields shorter signatures, and is affected neither by birthday attacks nor by the recent progresses in collision-finding algorithms.