Traceable multi-authority attribute-based encryption scheme for cloud computing

Based on linear secret sharing and digital signature, a new multi-authority attribute-based encryption scheme is proposed. In our scheme, a signature on a user's identity is embedded in the user's private key. The third party can directly trace the identity of the owner of the private key according to the leaked private key, and can verify the correctness of the user's identity publicly. Moreover, multiple authority centers jointly generate the private key of the user, which effectively solves the security problem existing in an authority center. The storage performance analysis results show that our scheme is very suitable for cloud computing environment.