Proxy signatures for delegating signing operation
CCS '96 Proceedings of the 3rd ACM conference on Computer and communications security
Secure Mobile Agent Using Strong Non-designated Proxy Signature
ACISP '01 Proceedings of the 6th Australasian Conference on Information Security and Privacy
A Digital Nominative Proxy Signature Scheme for Mobile Communication
ICICS '01 Proceedings of the Third International Conference on Information and Communications Security
A privacy-protecting proxy signature scheme and its application
ACM-SE 42 Proceedings of the 42nd annual Southeast regional conference
A threshold proxy signature scheme using self-certified public keys
ISPA'04 Proceedings of the Second international conference on Parallel and Distributed Processing and Applications
On the security of some nonrepudiable threshold proxy signature schemes
ISPEC'05 Proceedings of the First international conference on Information Security Practice and Experience
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Allowing a proxy signer to generate a signature on behalf of an original signer, a proxy signature should satisfy the property of strong unforgeability: anyone except the designated proxy signer cannot create a valid proxy signature on behalf of the original signer. Since proxy signatures, as well as their derivatives, can be used in many applications in reality, such as secure mobile agent, e-commerce systems and etc., they have been receiving extensive research recently. In this paper, we show that the proxy signature scheme [14] from ISPA'04 will suffer from the original signer's forgery attack if the original signer once gets a valid proxy signature on a message, and a similar attack arises in the proxy signature scheme [1] from AWCC'04 if the verifier does not check the originality of the proxy signer's proxy public key before verifying a proxy signature. Therefore, in some degree, neither of these two schemes meets the property of strong unforgeability.