The paper analyzes the security proof of an identity-based proxy signature from lattices,points out the drawbacks in the security proof,which leads to the fact that the security proof doesn't achieve signature unforgeability.Aiming at the existing problems in the security proof,this paper introduces new parameters,resets some system parameters,changes the corresponding query response modes,makes up for the defects in the security proof.Finally,signature unforgeability is proved.
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