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On the Security of a Certificateless Proxy Signature Scheme in the Standard Model

摘要


Certificateless cryptosystem can overcome the costly certificate management in the traditional public key cryptosystem, and meanwhile it does not have the private key escrow problem in the identity-based cryptosystem. Proxy signature can allow a proxy signer authorized by an original signer to sign messages on behalf of the latter. In this paper, we show that a recently proposed certificateless proxy signature scheme in the standard model is vulnerable to the public key replacement attack. Through this kind of attack, a malicious original signer or proxy signer can forge a valid proxy signature. We analyse the reasons for the success of the attack and point out the flaw in the proof of the original scheme.

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