An Efficient Proxy Signature Scheme without Random Oracle Model

摘要

Proxy signature is an important delegation technology, it allows an original signer to delegate her signing capability to a proxy signer and the proxy signer can produce a signature on behalf of the original signer. In this paper, we proposed an efficient proxy signature scheme without random oracle model based on Zhang et. al's signature scheme. Then the scheme is proven secure in the standard model and the security of the scheme is related to the k+1-Square Roots Assumption. Compared with Huang et. al scheme, our scheme has several advantages over Huang et.al's scheme in terms of the size of public key and computational costs of generation and verification of proxy signature.