Circuit Cipher text-policy Attribute-based Hybrid Encryption with Verifiable Delegation in Cloud Computing
- The generic KEM/DEM construction for hybrid encryption which can encrypt messages of arbitrary length.
- They seek to guarantee the correctness of the original ciphertext by using a commitment.
- We give the anti-collusion circuit CP-ABE construction in this paper for the reason that CPABE is conceptually closer to the traditional access control methods.
- The cloud server might tamper or replace the data owner’s original ciphertext for malicious attacks, and then respond a false transformed ciphertext.
- The cloud server might cheat the authorized user for cost saving. Though the servers could not respond a correct transformed ciphertext to an unauthorized user, he could cheat an authorized one that he/she is not eligible.
Platform : cloud computing
To the best of our knowledge, we present a circuit ciphertext-policy attribute-based hybrid encryption with a verifiable delegation scheme. General circuits are used to express the strongest form of policy on access control. Combined verifiable computation and encryption-then-mac mechanism with our ciphertextpolicy attribute-based hybrid encryption, we could delegate the verifiable partial decryption paradigm to the cloud server. In addition, the proposed scheme is proven to be secure based on the assumption of k-multilinear Decisional Diffie-Hellman.