Secure Lattice-Based Ciphertext-Policy Attribute-Based Encryption from Module-LWE for Cloud Storage

Ciphertext-Policy Attribute-Based Encryption (CPABE) is the most promising scheme to achieve fine-grained access control and data privacy in a cloud environment by offering oneto-many encryption. However, most existing CP-ABE schemes are fragile to quantum attacks because they are constructed using bilinear pairing assumptions. This paper proposes a Secure Lattice-Based CP-ABE scheme (SL-CP-ABE) from the Module Learning With Errors (M-LWE) to defend against quantum attacks and to realize fine-grained access control and data privacy in the cloud storage. The security of SL-CP-ABE proved against the Indistinguishable Selective Chosen Plaintext Attack (INDsCPA) under the hardness of the M-LWE. The performance analysis demonstrates that the SL-CP-ABE scheme is efficient and practical.