Cryptology ePrint Archive: Report 1999/008
Verifiable Encryption and Applications to Group Signatures and Signature Sharing
Jan Camenisch and Ivan Damgaard
Abstract: We generalize and improve the security and efficiency of the
verifiable encryption scheme of Asokan et al., such that it can rely
on more general assumptions, and can be proven secure without
assuming random oracles. We show a new application of verifiable
encryption to group signatures with separability, these schemes do
not need special purpose keys but can work with a wide range of
signature, identification, and encryption schemes already in use.
Finally, we extend our basic primitive to verifiable threshold and
group encryption. By encrypting digital signatures this way, one
gets new solutions to the verifiable signature sharing problem.
Category / Keywords: public-key encryption, zero-knowledge protocols, verifiable signature sharing, group signatures
Publication Info: Appeared in the THEORY OF CRYPTOGRAPHY LIBRARY and has been included in the ePrint Archive.
Date: received March 23, 1999
Contact author: camenisch at brics dk
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