Two-Party Attribute-Based Key Agreement Protocol with Constant-Size Ciphertext and Key

Abstract EN

Based on mutual authentication, the session key is established for communication nodes on the open network.

In order to satisfy fine-grained access control for cloud storage, the two-party attribute-based key agreement protocol (TP-AB-KA) was proposed.

However, the existing TP-AB-KA protocol is high in the cost of computation and communication and is not unfit for application in a mobile cloud setting because mobile devices are generally resource constrained.

To solve the above issue, we propose a TP-AB-KA protocol with constant-size ciphertext and key.

Our TP-AB-KA protocol is provable security in the standard model.

The concrete proof is given under the augmented multisequence of exponents' decisional Diffie-Hellman (aMSE-DDH) hypothesis in the attribute-based BJM model (AB-BJM).

Compared with the existing TP-AB-KA protocols, the computation cost and communication cost of our protocol are largely reduced.