中文摘要：

为了确保基于大数据的群通信的安全性,并提高通信效率和实用性,提出了一种新的动态密钥传输协议。该协议允许任何一位群成员作为发起者分发群密钥,整个密钥传输过程无须在线的可信中心,且无须安全的通信信道。该协议的安全性基于Diffie-Hellman密钥协商协议以及线性秘密共享方案。当群成员发生变更时,群通信发起者与其他群成员间共享的两方秘密无须更新,能够很好地适应群成员的动态变化。该协议适用于许多基于大数据的面向群的应用。

英文摘要：

In order to meet the requirements of secure,efficient and practical group communication based on big data,this paper proposed a dynamic group key transfer protocol.The protocol allowed any group member to be an initiator to distribute a random number as a group key in the protocol.It could efficiently distributed group keys for group members without an online KGC.The Diffie-Hellman key agreement and a linear secret sharing scheme provided the security bases for this protocol.When the group members were changing,the protocol did not need to update the existing secret shared between the initiator and the other group members.Thus,it is very efficient and is desirable for many group-oriented applications over big data.