基于ECC的三叉树群组密钥协商方案

TERNARY TREE GROUP KEY AGREEMENT SCHEME BASED ON ECC

随着互联网的飞速发展,通信工具以及通信方式越来越多。从以前的单点传播发展到现在的组播,例如群组聊天、视频会议等。随着通信工具的普及,通信的安全越来越受到重视。对于安全的群组通信,必须在组成员之间提供消息的完整性、成员身份验证和机密性。为了提供消息的完整性,必须保证群组成员在公共会话密钥协商达成一致,以便对群组通信的数据进行加解密。提出一种高效的群组密钥协商协议。通过基于Diffie Hellman密钥交换协议的椭圆曲线算法(ECC)来支持群组成员加入、离开等操作。采用三叉树来实现群组密钥的生成,并与现有方案进行比较,结果表明,该方案在通信和计算方面具有优势。

With the rapid development of the Internet, there are more and more communication tools and communication methods. They propagate from single point to current multicast, such as group communication, video conference and so on. With the popularization of communication tools, more and more attention has been paid to the security of communication. For secure group communication, message integrity, membership authentication, and confidentiality must be provided between group members. To provide the integrity of the message, the group members must be ensured to agree on a public session key negotiation in order to encrypt and decrypt the data of the group communication. In this paper, we proposed an efficient group key agreement protocol. It supported group members to join and leave by using elliptic curve cryptography（ECC） on the basis of the Diffie Hellman exchange protocol. This protocol employed ternary tree structure in the process of group key generation. Compared with the existing schemes, the protocol has advantages in communication and calculation.