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doi:10.1016/j.ipl.2003.10.008 
Copyright © 2003 Elsevier B.V. All rights reserved.
On the security of the verifiably-encrypted signature scheme of Boneh, Gentry, Lynn and Shacham
F. Hess
Received 18 February 2003;
revised 13 October 2003.
Communicated by R. Backhouse
Available online 3 December 2003.
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Abstract
We discuss the security of the verifiably-encrypted signature scheme of Boneh, Gentry, Lynn and Shacham. It is quite realistic to allow adversaries access to adjudication oracles for different users but the same adjudicator. This presents an extension of the security model considered by Boneh, Gentry, Lynn and Shacham and we describe an efficient attack on their scheme in that model. We then show how to obtain security in this extended model by applying a small modification to their scheme.
Author Keywords: Safety/security in digital systems; Signature schemes
