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| A New Secure Universal Designated Verifier Signature Proof System |
| Chen Guo-min; Chen Xiao-feng |
| Department of Computer Science, Sun Yat-sen University, Guangzhou 510275, China |
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Abstract The notion of Universal Designated Verifier Signature (UDVS) allows any holder of a signature to convince any designated verifier that the signer indeed generated the signature without revealing the signature itself, while the verifier can not transfer the proof to convince anyone else of this fact. Such signature schemes can protect the privacy of signature holders and have applications to certification systems. However, they require the designated verifier to create a public key using the signer’s public key parameter and have it certified to ensure the resulting public key is compatible with the setting that the signer provided. This is unrealistic in some situations. Very recently, Baek et al introduced the concept of Universal Designated Verifier Signature Proof (UDVSP) to solve this problem in Asiacrypt 2005. In this paper, it is first showed that there exits a security flaw in this UDVSP, i.e., it does not satisfy the non-transferability. A new secure UDVSP system is proposed and the system is proved to achieve the desired security notions.
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Received: 29 September 2007
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2009, Vol. 31 
