| Summary: | Aiming at the demand for large-scale data storage,how to securely realize remote access to user data using cloud sto-rage technologies while retaining data portability and security is a research hotspot at present.In USENIX Security 2022,Chen et al.proposed an efficient and portable blind cloud storage scheme for the case where users just hold one low-entropy password.However,the scheme inevitably inherits the weakness of passwords unresistant to online dictionary attack.To compensate the security shortage of password-only authentication,this paper designs a two-factor authentication scheme for blind cloud storage system based on password and smart card.Experimental results show that the proposed scheme not only realizes portability,deployability and blind cloud storage,but also achieves a higher level of security over password-only authentication schemes with equivalently computation and communication efficiency.
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