关键词: 车载自组网, 图像加密, 混沌映射, Lyapunov指数

Abstract: Security is one of the key factors for the equipment of VANET（Vehicular Ad Hoc Network） on the military motorcade. The security, integrity and non-repudiation of VANET can be satisfied by an important technique——encryption. The traditional encryption technique, which is based on Hash function, has been proven that it can be attacked by differencing the modes. This paper presents a dynamic encryption scheme of VANET based on the compound chaotic mapping. The compound chaotic mapping is used in the image encryption transmission by constructing an experimental system of VANET. This system has the functions of multiple hop transmission and network topology display. The results indicate that the encrypted image has the feature of pseudo-randomness and initial value sensitivity. Therefore, effective encryption and higher security can be provided by this scheme.

Key words: VANET, image encryption, chaotic mapping, Lyapunov index