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PKC
2010
Springer

Confidential Signatures and Deterministic Signcryption

9 years 4 months ago
Confidential Signatures and Deterministic Signcryption
Encrypt-and-sign, where one encrypts and signs a message in parallel, is usually not recommended for confidential message transmission. The reason is that the signature typically leaks 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 and a comprehensive discussion of the relationship of different notions we propose. 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 revisit 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...
Alexander W. Dent, Marc Fischlin, Mark Manulis, Ma
Added 14 Oct 2010
Updated 14 Oct 2010
Type Conference
Year 2010
Where PKC
Authors Alexander W. Dent, Marc Fischlin, Mark Manulis, Martijn Stam, Dominique Schröder
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