Certificateless Anonymous User Authentication Protocol for Cloud Computing

Recently, many user authentication schemes for cloud computing have been proposed. However, most of the proposed schemes have security flows and high computation costs. In this paper, a securely efficient cloud computing user authentication protocol is proposed, which is based on certificateless cryptology scheme without bilinear pairings to minimize the authentication time. Moreover, user anonymity service is achieved via a temporary identity (TID) provided by ID provider, instead of user's true identity. Additional replay protection from an attacker is included in the authentication phase to prevent a possible replay attack. Compared with the related works, the proposed scheme has higher security levels, which is more practical in cloud computing environment.