针对大数据安全的动态群密钥传输协议

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，本文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需在线的可信中心，且无需安全的通信信道。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，群通信发起者与其它群成员间共享的两方秘密无需更新，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。

Dynamic group key transfer protocol for big data security

In order to meet the requirements of secure, efficient and practical group communication based on big data, this paper proposes a dynamic group key transfer protocol. The protocol allows any group member to be an initiator to distribute a random number as a group key in the protocol. It can efficiently distributes group keys for group members without an online KGC. The Diffie-Hellman key agreement and a linear secret sharing scheme provide the security bases for our protocol. When the group members are changing, the protocol does 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.