International Association for Cryptologic Research

International Association
for Cryptologic Research

CryptoDB

Tor E. Bjørstad

Publications

Year
Venue
Title
2006
PKC
2005
EPRINT
Building Better Signcryption Schemes with Tag-KEMs
Tor E. Bj{\o}rstad Alexander W. Dent
Signcryption schemes aim to provide all of the advantages of simultaneously signing and encrypting a message. Recently, Dent and Bj{\o}rstad 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.

Coauthors

Alexander W. Dent (2)