A proxy-protected twin signature scheme

In the past few years, proxy signature has become an important research area and many excellent proxy signature schemes have been proposed. However, to our best knowledge, most of the previously proposed schemes are all requiring hash functions for the security consideration, and there still doesn't exist a secure proxy signature scheme without hash function. Therefore, in this paper, based on twin-version generic DSA signature, we attempt to propose a new proxy-protected twin signature scheme. As it inherits the twin generic DSA signature's merits, our scheme doesn't require any hash function and is provably secure in generic model.