Deniable CP-ABE scheme towards an Audit free cloud storage service

Abstract

Cloud storage services have become increasingly popular. Because of the importance of privacy, many cloud storage encryption schemes have been proposed to protect data from those who do not have access. All such schemes assumed that cloud storage providers are safe and cannot be hacked; however, in practice, some authorities (i.e., coercers) may force cloud storage providers to reveal user secrets or confidential data on the cloud, thus altogether circumventing storage encryption schemes. In this paper a new cloud storage encryption schema is proposed which allows cloud storage providers to protect user privacy. Since authorities cannot tell the obtained secrets are true or false, the cloud storage providers ensure that the user privacy is still securely provided. The proposed schemes believe cloud storage service providers or trusted third parties handling key management are trusted and cannot be hacked. Sometimes may intercept, the communication between users and cloud storage providers and then compel storage providers to release user secrets by using government power or other means. In this case the encrypted data are assumed to be known and storage providers are requested to release user secrets. The proposed Deniable CP-ABE scheme is to build an Audit free cloud storage service. The deniability feature makes coercion invalid , and the ABE property ensures secure cloud data sharing with a fine grained access controlled mechanism.