An Efficient Proxy-Protected Signature Scheme Based on Factoring

Proxy signature is an active cryptographic research area, and a wide range of literature can be found nowadays suggesting improvement and generalization of existing protocols in various direction. However, most of previously proposed schemes in these literatures are based on discrete logarithm problems. To our best knowledge, there still doesn’t exist an indeed proxy signature scheme based on factoring. The paper present a new proxy signature scheme based on factoring, along with a complete proof of security in the Random Oracle model. The proposed scheme does not need a secure channel to transmit proxy private key.