Improved Key Exchange Protocol for Space Networks

Aiming at the characteristics of space networks and their special requirements for key exchange, this paper proposes a key exchange protocol for space networks.It is based on the Internet Key Exchange(IKE) protocol, and robust to Denial of Service(DoS) attacks by adding circular DH queue and increasing the calculate intensity of Cookie.Some improved methods are presented in defending man-in-middle attack, option attack and reflect attack.Theoretical analysis shows that the protocol has more security, less exchange messages and it adapts to the space networks.