Pairing-Based Proxy Signature Scheme with Proxy Signer's Privacy Protection

Abstract

Based on bilinear pairings, a proxy signature scheme with proxy signer's privacy protection is proposed, in which a proxy signer signs messages on behalf of the original signer while the proxy signer is anonymous to anyone but the original signer. If necessary, the anonymity can be revoked by the original signer to identify the proxy signer. Neither this scheme needs any trusted third party nor the proxy signers need publish the extra public keys corresponding to their alias. On the other hand, both the original signer and the proxy signers can open the identities of the proxy signers from a valid proxy signature. Then, neither the original signer nor the proxy signer can deny the identity of a valid proxy signature. So, the proposed scheme can be used in e- voting, e-auction and other environment where individual privacy needs careful protection.