Title: Round-optimal ID-based dynamic authenticated group key agreement

Authors: Fei Li; Dongqing Xie; Wei Gao; Jianhua Yan; Xu An Wang

Addresses: School of Mathematics and Information Science, Guangzhou University, Guangzhou 510000, China ' School of Mathematics and Information Science, Guangzhou University, Guangzhou 510000, China ' School of Mathematics and Statistics, Ludong University, Yantai 264025, China ' School of Mathematics and Statistics, Ludong University, Yantai 264025, China ' Department of Electronic Technology, Engineering University of CAPF, Xi'an 710086, China

Abstract: A group key agreement protocol provides a set of users with a shared secret key to achieve cryptographic goal. When membership changes, group session key should be updated efficiently and securely. Hence, dynamic group key agreement protocols are of practical significance. Identity-based group key agreement protocols are preferred to certificate-based ones since identity-based protocols can simplify public key management procedure. Most of previous dynamic group key agreement protocols need at least two rounds to establish or refresh group session keys. In this paper, an identity-based dynamic authenticated group key agreement (DAGKA) protocol is presented. It is round-optimal, since: 1) in setup and join algorithms, only one round of communication is required; 2) in leave algorithm, there is no message exchange among group members. Joining members cannot compute previous session keys and leaving members cannot compute subsequent session keys. The protocol is provably secure. Its AKE-security is proved under decisional bilinear Diffie-Hellman (DBDH) assumption. In addition, the protocol resists key control attack and achieves forward security.

Keywords: identity-based cryptography; dynamic authentication; group key agreement; provable security; pairing; public key management; key control attacks.

DOI: 10.1504/IJHPSA.2016.080666

International Journal of High Performance Systems Architecture, 2016 Vol.6 No.3, pp.153 - 161

Available online: 27 Nov 2016 *

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