Perfect forward secure identity-based authenticated key agreement protocol in the escrow mode

The majority of existing escrowable identity-based key agreement protocols only provide partial forward secrecy. Such protocols are, arguably, not suitable for many real-word applications, as the latter tends to require a stronger sense of forward secrecy—perfect forward secrecy. In this paper, we propose an efficient perfect forward-secure identity-based key agreement protocol in the escrow mode. We prove the security of our protocol in the random oracle model, assuming the intractability of the Gap Bilinear Diffie-Hellman (GBDH) problem. The views and opinions expressed in this article are those of the author and should not be taken to represent, in whole or in part, the views of the Australian Government, the Australian Institute of Criminology, and the Australian National University. Research was undertaken in the author’s personal capacity. Supported in part by the National High-Tech Research & Development Program of China (Grant No. 2006AA01Z424), the National Natural Science Foundation of China (Grant Nos. 60673079, 60773086), and the National Basic Research Program of China (Grant No. 2007CB311201)