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Paper 2011/592

Generic Constructions for Verifiable Signcryption

Laila El Aimani

Abstract

Signcryption is a primitive which simultaneously performs the functions of both signature and encryption in a way that is more efficient than signing and encrypting separately. We study in this paper constructions of signcryption schemes from basic cryptographic mechanisms; our study concludes that the known constructions require expensive encryption in order to attain confidentiality, however some adjustments make them rest on cheap encryption without compromising their security. Our constructions further enjoy verifiability which entitles the sender or the receiver to prove the validity of a signcryption with/out revealing the \emph{signcrypted} message. They also allow the receiver to release some information which allows anyone to publicly verify a signcryption on a given message. Finally, our constructions accept efficient instantiations if the building blocks belong to a wide class of signature/encryption schemes.

Metadata
Available format(s)
PDF PS
Category
Cryptographic protocols
Publication info
Published elsewhere. ICISC'11
Keywords
signcryptionsign-then-encrypt paradigmcommit-then-encrypt-and sign paradigmencrypt-then-sign paradigm(public) verifiabilityhomomorphic encryption.
Contact author(s)
laila elaimani @ yahoo fr
History
2011-11-03: received
Short URL
https://ia.cr/2011/592
License
Creative Commons Attribution
CC BY
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