Efficient ID-Based One Round Authenticated Group Key Agreement Protocol

Identity-based authenticated group key agreement has been increasingly researched because of the simplicity of a public key management. Basically, these protocols provide authentication by signatures. Hence they are less efficient for the verification of signatures creates additional computational overhead. In the paper, we propose an efficient authenticated group key agreement protocol by introducing a modified identity-based public key infrastructure with new system setup and key extraction algorithms. Our proposed protocol can be instantiated to a key agreement protocol between domains without additional overhead. Moreover, our protocol requires only one round and is more efficient than all previously known ones since it provides authentication without using signatures.