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Paper 2005/405

Building Better Signcryption Schemes with Tag-KEMs

Tor E. Bjørstad and Alexander W. Dent

Abstract

Signcryption schemes aim to provide all of the advantages of simultaneously signing and encrypting a message. Recently, Dent and Bjørstad investigated the possibility of constructing provably secure signcryption schemes using hybrid KEM-DEM techniques. We build on this work by showing that more efficient insider secure hybrid signcryption schemes can be built using Tag-KEMs. To prove the effectiveness of this construction, we will provide several examples of secure signcryption Tag-KEMs, including a brand new construction based on the Chevallier-Mames signature scheme which has the tightest known security reductions for both confidentiality and unforgeability.

Metadata
Available format(s)
PDF PS
Category
Public-key cryptography
Publication info
Published elsewhere. Unknown where it was published
Keywords
signcryptionhybrid signcryptionhybrid cryptography.
Contact author(s)
a dent @ rhul ac uk
History
2006-04-26: revised
2005-11-14: received
See all versions
Short URL
https://ia.cr/2005/405
License
Creative Commons Attribution
CC BY
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