支持虚拟车辆辅助假名更新的混合区位置隐私保护方案

在车载通信系统中，车辆的位置信息泄露会危及驾驶员的隐私安全，而基于混合区中车辆的假名更新是实现位置隐私保护的一种有效方法。然而，现有的一些混合区方案忽略了车辆密度变化对位置隐私保护效果的影响。针对此问题，本文提出了一种支持虚拟车辆辅助假名更新的混合区位置隐私保护方案。该方案旨在根据周围合作车辆的密度不同来动态调整生成所需的虚拟车辆，并广播它们的踪迹，使攻击者无法区分虚拟车辆和真实车辆，从而实现车辆的位置隐私保护。仿真实验结果表明，该方案通过引入虚拟车辆信息，使攻击者无法区分虚拟车辆和真实车辆，有效降低了车辆真实位置或轨迹泄露的可能性，同时提高了交通密度较低情况下的位置隐私保护效果。

Mix zone location privacy protection scheme supporting virtual vehicle assisted pseudonym changes

In the vehicle communication system, location information leakage of vehicles can endanger the privacy and security of drivers, and pseudonym changes based on vehicles in the mixed zones are an effective way to achieve location privacy protection. However, some existing mixed zone schemes ignore the impact of vehicle density changes on location privacy protection. To solve this problem, this paper proposed a mix zone location privacy protection scheme that supported virtual vehicle-assisted pseudonym changes. The scheme aimed to dynamically adjust the generation of required virtual vehicles according to the density of surrounding cooperative vehicles and broadcast their tracks, so that attackers couldn''t distinguish between virtual vehicles and real vehicles, thereby achieving location privacy protection of vehicles. The simulation results show that the scheme introduces virtual vehicle information to make it impossible for attackers to distinguish between virtual vehicles and real vehicles, effectively reducing the possibility of leakage of the real location or trajectory of vehicles, and enhancing the location privacy protection effect under low traffic density.