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《Journal of Taiyuan Normal University(Natural Science Edition)》 2013-01
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The Security of Some Nominative Proxy Signature Schemes

Guo Yinfang(Education Institute of Taiyuan University,Taiyuan 030001,China))  
In a nominative proxy signature,an original signer delegates the signing right to a proxy signer.At this time,the proxy signer plays the role of the nominator.The proxy signer(nominator) generates a nominative signature on behalf of the original signer.Then,he transmits the proxy nominative signature to the nominee to verify it.In a nominative signature,besides requiring the property of proxy signature,the nominative signature also has nominative property.That is,only the nominee can verify the nominative proxy signature valid or not,if necessary,only the nominee can confirm that signature valid or not to the third party.According to satisfying the conditions for nominative signature,this paper analyzes Zhang et al.scheme.We point out that these schemes do not satisfy nominative property.In Zhang et al.scheme,nominator also can verify a nominative signature valid or not and confirm the nominative signature valid or not.
【CateGory Index】: TP309
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