Vehicle location privacy protection method based on group signature and reputation

Abstract

The invention discloses a vehicle position privacy protection method based on group signature and reputation, which comprises a reputation model for encouraging more vehicles to cooperate with each other to form a group, a privacy model for evaluating the position privacy strength of the vehicle, a group forming and dynamic mixed region establishing mechanism, and a pseudonym replacement mechanism. Any vehicle in the vehicle-mounted ad hoc network actively requests establishment of a group from a control server according to the reputation value of the vehicle when the pseudonym of the vehicleis soon to be expired; the control server allocates a group leader role to the requesting vehicle and dynamically forms a mixed region according to the current position of the requesting vehicle; theother vehicles in the mixed region judge whether the cooperation is participated in or not to change the pseudonym according to the reputation value, privacy strength and the remaining time of the pseudonym of the other vehicles; and the reputation value of the vehicles can be dynamically adjusted. According to the method, more vehicles can be encouraged to join the group, thereby changing the pseudonym in cooperation and ensuring the position privacy of the vehicles; meanwhile, the vehicles do not need to keep a silent state in the formed mixed region but broadcast messages as a group identity so that the running safety of the vehicles is guaranteed; furthermore, resource expenditure caused by unnecessary frequent change of the pseudonym can be effectively reduced.

Description

technical field [0001] The invention relates to the field of vehicle network communication security, in particular to a vehicle location privacy protection method based on group signature and reputation. Background technique [0002] In recent years, vehicular ad hoc networks have become a promising technical topic to improve the efficiency and safety of transportation systems and have attracted widespread public attention. In a vehicular ad hoc network, each vehicle is equipped with an on-board unit (OBU) communication device that allows them to communicate not only with each other, i.e., vehicle-to-vehicle (V2V) communication, but also with roadside infrastructure, i.e., vehicle-to-vehicle Infrastructure (V2I) communication; at the same time, the vehicle is equipped with a microprocessor unit, which has a certain computing power. The vehicle regularly broadcasts information to surrounding vehicles, including position, speed, and direction information, so as to improve the...

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Problems solved by technology

[0004] Purpose of the invention: The purpose of the present invention is to solve the defects of the vehicle location privacy protection method in the existing vehicle ad hoc network, such as the number of vehicles that cooperate to change pseudonyms is small, resulting in a decrease in location privacy security; at the same time, it reduces frequent unnecessary pseudonyms The resource overhead caused by the change encourages more vehicles to cooperate to change the pseudonym, improving the location privacy and security of the vehicle; in addition, it improves the defect that the vehicle remains silent in the mixed area, and the vehicle can broadcast messages as a group, reducing the impact on traffic. Hidden dangers caused by safety

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