A Secure Proxy Signature Scheme Based on the Hardness of the Decisional Diffie-Hellman Problem

摘要

In this paper we present a secure proxy signature scheme, which allows an original signer to delegate his/her signing capability to a proxy signer. Then the proxy signer can sign a message on behalf of the original signer. The proposed proxy signature scheme is based on the hardness of the decisional Diffie-Hellman problem. We give the formal definition and security model of a proxy signature scheme and prove its security in our security model. Our proxy signature scheme does not use bilinear pairings, which results in greater efficiency and ease of implementation.