In a certificate-based signature scheme,only the signers who possess both a certificate and a private key can generate a valid signature.The security analysis of a certificate-based proxy aggre-gate signature scheme proposed recently is presented,demonstrating that a malicious certificate au-thority can arbitrarily forge delegation and proxy signature.Based on the discrete logarithm problem on the elliptic curve,an improved certificate-based proxy aggregate signature scheme is constructed.Finally,the security and computation efficiency of the improved scheme are analyzed.
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