动态协作对等组中一种新的组密钥协商协议

动态协作对等组自身的特征使其安全机制面临着严峻的挑战。密钥协商机制则是构建安全的动态协作对等组的核心技术。提出了一种两方Weil对密钥协商协议(A-WGKA2)，可以通过较少的步骤同时实现节点之间的密钥协商和认证。该协议具备如下性质：前向安全性；抵抗未知密钥共享；部分密钥泄露的安全性；抵抗密钥控制；抵抗使用泄露的密钥进行假冒攻击。在A-WGKA2协议的基础上，进一步提出了一个新的适用于动态协作对等组的组密钥协商协议(A-WGKAn)。该协议在具有较低的计算和通信开销的同时，实现了节点之间的相互认证，适用于动态协作对等组。

Novel group key agreement protocol for dynamic collaborative peer groups

To achieve security in a dynamic collaborative peer group, group key agreement protocol should be provided. Two-party key agreement protocol based on the weil pairing protocol (A-WGKA2) was proposed in this paper. It may establish a secret key between two nodes and authenticate each other by fewer messages. The proposed protocol has the security properties such as forward secrecy, no unknown key-share, known session key security, no key control and no key-compromise impersonation. Further, we proposed a group key agreement protocol using weil pairing referred as A-WGKAn that was adapted to the dynamic collaborative peer groups. In the A-WGKAn protocol, the A-WGKA2 protocol was employed on key tree to establish and allocate group key. Therefore, it not only has low computational overhead and communication costs but also provides the node authentication.