Title

Multi-party stand-alone and setup-free verifiably committed signatures

RIS ID

22490

Publication Details

Zhu, H., Susilo, W. & Mu, Y. (2007). Multi-party stand-alone and setup-free verifiably committed signatures. In T. Okamoto & X. Wang (Eds.), International Conference/Workshop on Practice and Theory in Public Key Cryptography (pp. 134-149). Berlin: Springer-Verlag.

Abstract

In this paper, we first demonstrate a gap between the security of verifiably committed signatures in the two-party setting and the security of verifiably committed signatures in the multi-party setting. We then extend the state-of-the-art security model of verifiably committed signatures in the two-party setting to that of multi-party setting. Since there exists trivial setup-driven solutions to multi-party verifiably committed signatures (e.g., two-signature based solutions, we propose solutions to the multi-party stand-alone verifiably committed signatures in the setup-free model, and show that our implementation is provably secure under the joint assumption that the underlying Zhu’s signature scheme is secure against adaptive chosen-message attack, Fujisaki-Okamoto’s commitment scheme is statistically hiding and computationally binding and Paillier’s encryption is semantically secure and one-way as well as the existence of collision-free one-way hash functions.

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Link to publisher version (DOI)

http://dx.doi.org/10.1007/978-3-540-71677-8_10