Abstract: hhe notion of asymmetric group key agreement(ASGKA) was first introduced in EuroCrypt 2009，in which the group members merely negotiate a common encryption key which is accessible to attackers and corresponds to differtent decryption keys, each of which is only computable by one group member. One of the future works is to achieve asymmetric group key agreement with traitor traceability. In this paper, we proposed a provable security asymmetric group key agreement protocol ASGKAwI T in standard model,the new protocol provides traitor tractability.

Key words: Asymmetric group key agreement, Bilintar pairing, Multi-signature,hraitor tractability