International Journal of Engineering and Technology
A proxy re-signature scheme is one which allows a semi-trusted proxy to transform a signer A's signature on a message m, into a signature of signer B on the same message. The proxy is however not allowed to sign arbitrary messages on behalf of either signer. Several proxy re-signature schemes have been proposed, including one ID-based scheme. In this paper, the authors describe the flaw in this scheme, with respect to the definitions of delegator and delegate security defined. They define a novel and secure IDBased proxy re-signature scheme, which satisfies these security definitions.