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Paper 2007/372

On the Authentication of One Popular Signcryption Scheme

Zhengjun Cao

Abstract

Whether a recipient \textit{can prove} a signature to others is of great importance. The function is just one reason that we call a signature ``signature" rather than others. In this paper, we point out that one popular signcryption signature convinces \textit{only} the designated document's recipient that the signer deliberately signed the document. The \textit{designated recipient} can \textit{check} the validity of a given signcryptext but \textit{cannot prove} it to others. We also improve it using the efficient technique developed in Schnorr's signature instead of a zero-knowledge proof such that the receiver can \textit{check} the validity of a given signcryptext and \textit{can prove} it to a third party.

Metadata
Available format(s)
PDF
Category
Cryptographic protocols
Publication info
Published elsewhere. Unknown where it was published
Keywords
signcryptionuniversal authenticationrestrictive authenticationdesignated authentication
Contact author(s)
caozhj @ shu edu cn
History
2007-09-19: received
Short URL
https://ia.cr/2007/372
License
Creative Commons Attribution
CC BY
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