Research On Key Issues Of Security In Space Information Networks

With the rapid growth of satellite communications, space information networks which are composed of spacecrafts, including satellites, with the ability of space communication and ground stations have become an important issue. Various security protocols works as a kind of the kernel technology for the security of space information networks,thus their correctness and security are very crucial to space information networks. Correctness and security of these protocols play important roles in space information networks.The authenticated key exchange protocols, group key exchange protocols, group key management schemes, identification protocols, secure key issuing in identity based encryption, and security model for routing protocols are studied in this thesis.Firstly, an identity based authenticated key exchange protocol for space information network is proposed. The protocol takes the advantage of highly security and computation efficiency according to the analysis of security and efficiency.Secondly, two group key exchange protocols are given. The first one is proven to be universally composable secure by achives the ideal functionality of attribute-based group key exchange after the ideal functionality in universally composable framework is presented. This protocol helps attribute based applications in space information networks achieve secure group communication. The second one is characterized by dividing satellites in a space information network into clusters according to their orbits. Simulations show that this protocol has the advantage of high efficiency.Thirdly, based on the analysis of features of LEO/MEO double-layer space information network, a novel identity based group key management scheme is proposed in which all nodes in a space information network are divided into clusters and MEO satellites are cluster heads. Security analysis shows that the proposed scheme achieves forward security, backward security, and security against outside attackers. Simulations show that the proposed scheme takes advantage of high communication efficiency.Fourthly, a secure key issuing scheme for Boneh-Boyen1 identity based encryption is proposed for space information networks, in which multiple key privacy authorities are set in addition to the key generation center to protect the privacy of users'private keys. A rigorous security proof in standard model of our secure key issuing protocol is also given.Fifthly, an identity based identification protocol is proposed which uses ElGamal signature of a network node's identity as the node's private key. The node proves its identity through zero-knowledge proof of its private key. Security proof of the protocol and efficiency analysis is also given which indicates that our protocol is efficient in computation and communication. Thus the protocol is suitable for space information networks.Sixthly, based on the features of satellite backbone network in space information network, common types of vulnerabilities are analysed, and a new security model for routing protocols in satellite networks is presented.