车联网中支持动态操作的密钥协商协议

Key Agreement Protocol with Dynamic Property for VANETs

车载自组网(VANETs)对开放的网络和资源受限的环境在安全性和效率方面提出了更高的需求.目前大多数密码方案由于效率较低、计算开销较大等原因无法直接应用于VANETs.针对传统密钥协商协议通信轮数偏高、密钥更新效率较低等问题,本文设计了一种支持高效密钥更新和动态特性的VANETs密钥协商协议.提出了一种基于移位寄存器的SBIBD(对称平衡不完全区组设计)构造方案,提升了构造效率.采用不可区分混淆技术从而支持用户的动态操作,提升了密钥更新效率.给出了密钥生成和密钥更新阶段的威胁模型并给出了相应的安全性分析,表明基于现有的安全密码学方案,本文协议能够保证密钥协商和密钥更新的安全.基于PBC密码学库对本文协议进行模拟并与同类型的协议进行对比,表明本文协议在性能上优于现有同类协议.

Vehicular ad hoc networks(VANETs)have higher demands on security and efficiency in open networks and resource-constrained environments.Currently,most existing cryptographic schemes cannot be directly applied to VANETs due to reasons such as low efficiency and high computational overhead.Aiming at the problems of high communication rounds and low efficiency of the key update in traditional key agreement protocols,this paper proposes a key agreement protocol with dynamic property for VANETs.The symmetric balanced incomplete block design(SBIBD)and the indistinguishable obfuscation technology are employed to support efficient key update and dynamic property of the proposed key agreement protocol.In order to improve the construction efficiency of the SBIBD structure,an SBIBD construction scheme is proposed based on shift registers.In addition,the indistinguishable obfuscation technology is utilized to support the dynamic change of users.A threat model is given in this paper,and the corresponding security analysis shows that the proposed protocol can guarantee the security of the key agreement and the key update based on existing secure cryptographic schemes.The proposed protocol is simulated based on the PBC cryptography library and compared with the same type of protocols.The experimental results show that the proposed protocol is superior to many existing protocols.