International Association for Cryptologic Research

International Association
for Cryptologic Research

IACR News item: 17 March 2025

Zhengjun Cao, Lihua Liu
ePrint Report ePrint Report
We show that the aggregate signature scheme [IEEE Syst. J., 2023, 17(3), 3822-3833] is insecure against forgery attack. This flaw is due to that the ephemeral key or ephemeral value chosen in the signing phase is not indeed bound to the final signature. An adversary can sign any message while the verifier cannot find the fraud. We also suggest a revising method to frustrate this attack.
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