Secure and Anonymous Data Transmission System for Cluster Organised Space Information Network

Space Information Network (SIN) plays an important role in civil and national defense field, and it is highly emphasized by governments. Data transmitted and processed in SIN is massive and dynamic, which is collected by entities in the space. However, with the widely development of SIN, data security in storage and communication is facing a great challenge, and network-based attacks would leak top-secret information, which may lead to social unrest or even threatening national security. Members in SIN like the satellites, spacecrafts and aircrafts normally transmit data in clusters divided according to their function, mission and position, and each member has a superior in the upper layer. Thus we propose a secure and anonymous data transmission system for cluster organised Space Information Network in this paper to improve the security in SIN. Members in this system transmit data in clusters, and there is a cluster head managing all its cluster members. The public key is a meaningful string like the receiver's identity, which is convenient for senders to check the correctness. To reduce the burden of a single public key generator (PKG), private key can be generated from the superior in the upper layer. In addition, messages transmitted in this system are anonymous, while in consideration of non-repudiation, a cluster head can trace the message sender if there are disputes occurring, thus the malicious cluster member will be eliminated by the cluster head. Finally, zero-knowledge proof systems are used to ensure that the ciphertext is generated legally. This system is proved in a full version paper, which is semantic secure, anonymous and traceable, with a perfectly zero-knowledge proof, and its efficient performance shows that it can be applied in SIN.