Novel group key transfer protocol for big data security

A dynamic group key transfer protocol is presented to meet the requirements of the secure, efficient and practical group communication based on big data. Any group member is allowed to be an initiator to distribute a random number as a group key in the protocol, which can be executed without an online key generation center (KGC). The security of the protocol is based on the Diffie-Hellman key agreement and a linear secret sharing scheme. The existing secret shared between the initiator and the other group members do not need to be updated when the group members are changing, thus, it is very efficient and is desirable for many group-oriented applications over big data.