The verifiably encrypted signature schemes proposed by Asokan solved the fairness problem in the fair exchange process. In the work, we propose an ID-based strong unforgeability verifiably encrypted signature scheme without random oracles, and show that the security of the scheme is based on the difficulty of solving the Computational Diffie-Hellman problem. Our scheme is obtained from a modification of Waters' recently proposed signature schemes. This is the first time that an ID-based verifyably encrypted signature schemes is proved in the standard model.
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