一种高效的组密钥管理算法：CKCS
An Efficient Group Key Management Using Code for Key Calculation for Simultaneous Join/Leave: CKCS
摘要：
提出了一种有效的安全组播同时加入/离开的组密钥管理协议CKCS（Code for Key Calculation in Simultaneous Join/Leave）。该协议基于逻辑密钥层次结构。在该协议中，当新成员同时加入组时，服务器只发送这些新成员的组密钥。然后，当前成员和新成员通过节点编码和单向哈希函数计算出所需的密钥。节点代码是分配给每个密钥的随机数，以帮助用户计算所需的密钥。同样，在离开时，服务器只是将新的组密钥发送给剩余的成员。结果表明，CKCS减少了计算和通信开销，同时加入/离开的消息大小。
英文摘要：
This paper presents an efficient group key management protocol, CKCS (Code for Key Calculation in Simultaneous join/leave) for simultaneous join/leave in secure multicast. This protocol is based on logical key hierarchy. In this protocol, when new members join the group simultaneously, server sends only the group key for those new members. Then, current members and new members calculate the necessary keys by node codes and one-way hash function. A node code is a random number which is assigned to each key to help users calculate the necessary keys. Again, at leave, the server just sends the new group key to remaining members. The results show that CKCS reduces computational and communication overhead, and also message size in simultaneous join/leave.
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