Proxy signatures for delegating signing operation
CCS '96 Proceedings of the 3rd ACM conference on Computer and communications security
New nonrepudiable threshold proxy signature scheme with known signers
Journal of Systems and Software
Secure Mobile Agent Using Strong Non-designated Proxy Signature
ACISP '01 Proceedings of the 6th Australasian Conference on Information Security and Privacy
ICICS '97 Proceedings of the First International Conference on Information and Communication Security
A Digital Nominative Proxy Signature Scheme for Mobile Communication
ICICS '01 Proceedings of the Third International Conference on Information and Communications Security
A Strong Proxy Signature Scheme with Proxy Signer Privacy Protection
WETICE '02 Proceedings of the 11th IEEE International Workshops on Enabling Technologies: nfrastructure for Collaborative Enterprises
Threshold Proxy Signature Schemes
ISW '97 Proceedings of the First International Workshop on Information Security
Nonrepudiable proxy multi-signature scheme
Journal of Computer Science and Technology
Efficient ID-based blind signature and proxy signature from bilinear pairings
ACISP'03 Proceedings of the 8th Australasian conference on Information security and privacy
An efficient nonrepudiable threshold proxy signature scheme with known signers
Computer Communications
Cryptanalysis of Li et al.'s proxy signature scheme
CONTROL'05 Proceedings of the 2005 WSEAS international conference on Dynamical systems and control
Improvement of a nominative proxy signature scheme for mobile communication
CONTROL'05 Proceedings of the 2005 WSEAS international conference on Dynamical systems and control
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In 1996, Mambo et al introduced the concept of proxy signature. Proxy signature can be applied to mobile agent, e-vote etc. Recently, Sun and Hsieh showed that Lee et al's strong proxy signature scheme and its application to multi-proxy signature scheme, Shum and Wei's privacy-protected strong proxy signature scheme, and Park and Lee's nominative proxy signature scheme were all insecure against the original signer's forgery attack. In this paper, we show those proxy signature schemes don't withstand public key substitution attack and give some slight but important modifications for those proxy signature schemes such that the resulting schemes are secure against the original signer's forgery attack and public key substitution attack. In addition, we show that Park and Lee's nominative proxy signature scheme don't satisfy strong nonrepudiation and strong identifiability. Improved schemes satisfy all properties of strong proxy signature scheme, and doesn't use secure channel between the original signer and the proxy signer.