摘要： 针对空间时延容忍网络高延时、连接易中断等特点,提出一种非交互式的密钥交换协议,并在随机预言模型下对其进行安全性证明。该协议无需用户交互即生成一个共享的对称密钥,可消除对传统公钥基础设施中证书的依赖,减少通信与存储开销,同时避免基于身份的公钥加密体制中存在的密钥托管问题。分析结果表明,该协议未使用耗时的双线性对运算,具有较高的计算效率,更适用于计算能力受限、能量资源宝贵的空间环境。

关键词: 时延容忍网络, 非交互式密钥交换, 无证书密码, 可证明安全, 随机预言模型

Abstract: The space Delay Tolerant Network(DTN) has characteristic such as high delay and frequent disconnectivity.Aiming at this problem,this paper designs a non-interactive key exchange protocol,and it is proven secure in the random oracle model.The proposed protocol enables two parties to agree on a symmetric shared key without requiring any interaction.The protocol eliminates the dependency on certificate used in Public Key Infrastructure(PKI) and avoids the key escrow problem in ID-based Public Key Cryptography(ID-PKC).Analysis result shows that the proposed protocol does not utilize the expensive pairing computation and achieves higher efficiency compared with other Non-interactive Key Exchange(NIKE) protocols, and thus proves to be suitable for the space environment with restricted computing and few power resource.

Key words: Delay Tolerant Network(DTN), non-interactive key exchange, certificateless cryptography, provable security, random oracle model

中图分类号: 

• TP309