Confidential signatures and deterministic signcryption

Authored book
(Volume of book series)

Publication Details

Author(s): Dent A, Fischlin M, Manulis M, Stam M, Schröder D
Publication year: 2010
Title of series: Public Key Cryptography - PKC 2010
Pages range: 462-479
ISBN: 9783642130120


Encrypt-and-sign, where one encrypts and signs a message in parallel, is usually not recommended for confidential message transmission as the signature may leak information about the message. This motivates our investigation of confidential signature schemes, which hide all information about (high-entropy) input messages. In this work we provide a formal treatment of confidentiality for such schemes. We give constructions meeting our notions, both in the random oracle model and the standard model. As part of this we show that full domain hash signatures achieve a weaker level of confidentiality than Fiat-Shamir signatures. We then examine the connection of confidential signatures to signcryption schemes. We give formal security models for deterministic signcryption schemes for high-entropy and low-entropy messages, and prove encrypt-and-sign to be secure for confidential signature schemes and high-entropy messages. Finally, we show that one can derandomize any signcryption scheme in our model and obtain a secure deterministic scheme. © 2010 Springer-Verlag Berlin Heidelberg.

FAU Authors / FAU Editors

Schröder, Dominique Prof. Dr.
Lehrstuhl für Informatik 13 (Angewandte Kryptographie)

How to cite

Dent, A., Fischlin, M., Manulis, M., Stam, M., & Schröder, D. (2010). Confidential signatures and deterministic signcryption.

Dent, Alexander, et al. Confidential signatures and deterministic signcryption. 2010.


Last updated on 2018-16-12 at 13:50

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