ENHANCED SECURITY IN INTRA-GROUP COMMUNICATIONS

Most of the communications in today's world are carried-out over open networks. Taking into account the openness of networks prevalent, communications amidst group members must be protected, efficient and any technique applied should support dynamism. Group key agreement (GKA) is widely employed for secure group communications in modern collaborative and group-oriented applications. This work proposes to study the problems of GKA in identity-based cryptosystems to address the issues of round-efficiency, member-dynamism, and probably securing the key escrow, that is, ensuring its freeness. The problem is resolved by proposing a one-round dynamic asymmetric GKA[1] protocol in which a set of participators are allowed to build a common encryption key for the group, in run-time, that is, dynamically, and each participator will have a different decryption key, which is a secret/known only by self and no one else, in an identity-based cryptosystem. Knowing the group encryption key, any “participator” can encrypt to the group members so that only the members can decrypt. This protocol is built with a strongly non-forgeable, non-stateless and identity-based batch-multi-signature scheme which supports communication between the protocol participants.[2]