Chinese Remainder Theorem based DTN group key management

Delay Tolerant Network (DTN) has the character of long intermittent connectivity and communication delays, which makes the existing group key management mechanism can not be effectively applied. We proposed a new Chinese Remainder Theorem based group key management mechanism for DTN. Comparing with the early scheme, the existing joined node can derive a new group key from the old group key using hash function in the new user join phase, so the server does not need to broadcast any key update message for the newly user join, and only broadcasts one message for user leave. Meanwhile, aiming at the forward security problem in the many-to-many scenarios, the time-based group key management scheme is introduced. The simulation results show that the group key update success rate, latency and message authentication success rate for our scheme is better than CRGK and LKH schemes.