Abstract: In a proxy signature scheme, a potential signer delegates his signing power to a proxy, who signs a message on behalf of the original signer. The ring signature allows a user from a set of possible signers to convince the verifier that the author of the signature belongs to the set but the identity of the author is not disclosed. A new efficient IDbased proxy ring signature scheme was proposed based on the advantages of proxy signature and ring signature. Its security and efficiency was also discussed. Compared with Zhang’s scheme and Amit’s scheme, the new scheme has better computational efficiency.

Key words: proxy signature, ring signature, proxy ring signature, bilinear pairings