A public key cryptosystem and a signature scheme based on discrete logarithms
Proceedings of CRYPTO 84 on Advances in cryptology
Efficient identification and signatures for smart cards
CRYPTO '89 Proceedings on Advances in cryptology
Proxy signatures for delegating signing operation
CCS '96 Proceedings of the 3rd ACM conference on Computer and communications security
Threshold Proxy Signature Schemes
ISW '97 Proceedings of the First International Workshop on Information Security
Security proofs for signature schemes
EUROCRYPT'96 Proceedings of the 15th annual international conference on Theory and application of cryptographic techniques
Security weaknesses in two proxy signature schemes
ICCSA'06 Proceedings of the 2006 international conference on Computational Science and Its Applications - Volume Part III
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Proxy signatures are signature schemes that a signer (called original signer) delegates his signing capability to other people (called proxy signer), and the proxy signer creates signatures on behalf of the original signer. In application such as electronic voting and electronic commerce, the privacy may be concerned by the original signer. The original signer may hope that the proxy signers can sign on behalf of him without knowing the content of the signed message. Few efforts have been put on privacy protection of original signer in existed proxy signature schemes. In this paper, a privacy-protecting proxy signature scheme is proposed. In this scheme, the messages the original signer entrust to the proxy signer to sign on behalf of him are secret from the proxy signer during the generation of the proxy signature and from other people except the receiver designated by the original signer. Therefore, the privacy of the original signer is protected. The security of the proposed signature scheme is analyzed and its application to electronic voting is described.