An Improved Identity-based Fault-tolerant Conference Key Distribution Scheme

Fault-tolerance is an important property of conference key distribution protocol. Recently, Yang et al. proposed an identity-based fault-tolerant conference key distribution scheme which is much different to the traditional ones. But their scheme can not withstand passive attack and modification attack, moreover, it also can not provide forward security. An improved identity-based fault-tolerant conference key distribution scheme is proposed in this paper. Compared with the Yang et al. ´s scheme, Tzeng´s (2002) scheme and Xun´s scheme, the new scheme has illustrated the highest security and its communication cost is intervenient Yang et al. ´s scheme and Tzeng´s (2002) scheme. As security is the first-line property in conference key establishment protocol, our scheme is the most practical one in the mass.