Group Key Management Scheme Based on Proxy Re-cryptography for Near-Space Network

The Near-Space Network has gotten more and more attentions and become a new research focus with the rapidly development of space information system recently. It is a large network with characteristics of high exposure, dynamic topology, heterogeneous network, etc. The requirement of security for group communications system is much stronger. A group key management scheme based on the hierarchical and domain structure of Near-Space Network is proposed. The proxy re-cryptography algorithm is used in the rekeying process, which solves the problem of a single point of failure thoroughly. Rekeying algorithm for group members´ switching between domains is designed and can efficaciously reduce the rekeying overhead caused by switch actions of high speed nodes. The performance analysis shows that the proposed scheme is a secure and reliable group key management scheme for near-space network.