关键词: 深空DTN, 自主组密钥管理, 多解密密钥密钥协议

Abstract: Because a reliable end-to-end link is not available in deep space DTN (delay tolerant networks), the rekey process is not implemented efficiently by a key management center in key management. In order to deal with the question, this paper puts forward an autonomic group key management scheme, a key management center designs a logical key tree based on one-encryption-key multi-decryption-key key protocol, in which each leaf node corresponds to a network member having a secret decryption key, each non-leaf node corresponds to an encryption key which is computed by the secret decryption keys of leaf nodes that are in the subtree of non-leaf nodes. In proposed scheme, the capability of each member is same to the key management center on rekeying, and the forward security and backward security is guaranteed. With theory analysis, the rekeying message of the proposed scheme is half of LKH (logical key hierarchy) scheme when new node joins, and message cost is constant value when node leaves, so the proposed scheme is suitable to deep space DTN.

Key words: deep space DTN, autonomic group key management, multi-decryption-key key protocol