Proxy signatures for delegating signing operation
CCS '96 Proceedings of the 3rd ACM conference on Computer and communications security
ICICS '97 Proceedings of the First International Conference on Information and Communication Security
Threshold Proxy Signature Schemes
ISW '97 Proceedings of the First International Workshop on Information Security
EUROCRYPT'91 Proceedings of the 10th annual international conference on Theory and application of cryptographic techniques
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
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A proxy signature scheme allows an entity to delegate its signing power to another entity. Since the notion of proxy signatures was first introduced, many proxy signature schemes and various extensions have been considered. As an example, the notion of threshold proxy signature or proxy multi-signature was introduced as a group-oriented variant. In this paper, we show that the threshold proxy signature scheme proposed by Hsu and Wu, and the proxy multi-signature schemes independently proposed by Chen et al. and Hsu et al. are all insecure against the malicious original singer(s). Our result provides a simple example that the way to put the secret parts together should be carefully considered.