An Efficient Traceable and Anonymous Authentication Scheme for Permissioned Blockchain

Blockchain has become a hot topic in recent years. Many applications apply permissioned blockchain to achieve secure data sharing across organizations such as healthcare blockchain. In the permissioned blockchain, on the one hand, the blockchain system is required to support efficient and dynamic authentication for adding and deleting users in a distributed environment. On the other hand, in some particular applications such as healthcare domain, users prefer to keep anonymity in the process of authentication. Although many solutions for anonymous authentication have been proposed, they often require the participation of a central trusted party in the process of authentication and are not efficient enough. In this paper, we focus on designing an efficient traceable and anonymous authentication scheme, which supports efficient authentication while without revealing user’s identity information and does not requires the participation of a central trusted party. While, in case of dispute, the identity of users can be revealed. Moreover, the proposed scheme is able to support dynamic adding and deleting users. Finally, we analyze the security and privacy properties of the proposed scheme and evaluate its performance in terms of computational cost. The experimental results show that the proposed scheme is more efficient than exist schemes and can be easily deployed in the permissioned blockchain.