Proxy blind multi-signature scheme without a secure channel

摘要

Proxy signature and blind signature are two active cryptographic research areas, and have been applied in many occasions respectively. At the same time, to cope with some particular settings, proxy blind signature, two signatures combination, also becomes a current research hotspot. To our knowledge, many proxy blind signature schemes have been put forth till now. However, most of these proposed schemes have not been provably secure and all should rely on secure channels to transmit proxy secret key, and yet a secure channel could not always be obtained in current network environment. Therefore, in this paper, we would like to present a new proxy blind multi-signature scheme, which does not need a secure channel and is provably secure under the Random Oracle model.