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基于椭圆曲线公钥密码体制(ECC),建立了一个有中心节点的可认证的动态组密钥协商方案。方案仅需要两轮交互即可以实现各参与方的组密钥协商,无需使用密钥共享技术,减轻了各参与方的计算量与通信负担。方案还利用了组密钥服务中心(GKSC)机制,使组成员能够动态地加入或退出,并具有前向/后向保密性,而且协商的组密钥还能够对组密钥服务中心保密。
Based on elliptic curve public-key cryptosystem (ECC), a verifiable dynamic group key agreement scheme with central node is established. The scheme only needs two rounds of interaction to realize the group key agreement of each participant without using the key sharing technology, thus reducing the computational burden and communication burden of each participant. The scheme also utilizes a group key service center (GKSC) mechanism to enable group members to join or leave dynamically with forward / backward confidentiality, and the negotiated group key can also be kept confidential to the group key service center.