ITS Security Using Area Perception Requests for CPM Verification
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Solution Overview
Problem
Existing cooperative intelligent transport systems (C-ITS) face challenges in detecting and verifying misbehavior of ITS stations, particularly when there are no additional data to cross-check suspicious data received, leading to potential safety hazards due to perception blind-spots and malicious information transmission.
Innovation Solution
Implementing a security-related logical module (CPS_SEC) within the ITS communication stack to strategically send Area Perception Requests (APRs) to verify the position and object claims of other ITS stations, using trusted third-party feedback to confirm or refute the information received, and combining verification results with trustworthiness levels and detection margins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If ITS stations exchange perception information through CPMs without verification, then information sharing efficiency is improved, but reliability of the information deteriorates due to potential misbehavior and perception blind-spots
Solution Approach 1:
The system performs preliminary verification actions by sending Area Perception Requests (APRs) before fully trusting the received perception information. This allows the requesting ITS station to proactively verify the accuracy of position and object claims from other stations, preventing reliance on potentially false information while maintaining efficient information sharing through the established CPM mechanism
Solution Approach 2:
The verification mechanism implements a feedback loop where ITS stations send APRs to request verification of specific areas, receive perception information in response, and use this feedback to confirm or refute the authenticity of received CPM data. This feedback mechanism enhances reliability by allowing stations to cross-check suspicious information while preserving the overall efficiency of the CPM-based information sharing system
2Reliability
If additional verification mechanisms are implemented to detect misbehavior, then information reliability is improved, but device complexity deteriorates
Solution Approach 1:
The verification mechanism leverages the existing CPM infrastructure and message formats, making the verification function universal across all ITS stations without requiring separate dedicated verification systems. The same CPM messages used for information sharing also carry verification data, and the security layer integrates verification functions into the existing communication stack, avoiding additional complex hardware or protocols
Solution Approach 2:
The security layer acts as an intermediary that coordinates verification requests and responses between ITS stations. Rather than requiring complex peer-to-peer verification protocols between all stations, the security layer mediates the verification process by managing APR sending, receiving verification responses, and determining trustworthiness levels, thereby simplifying the overall system architecture while maintaining high reliability
Data Source
AI summary
A method for exchanging of information in an intelligent transport system between a plurality of intelligent transport system stations (ITS-Ss) in said intelligent transport system (ITS) uses a wireless communication channel. The exchanging of information comprises composing, transmitting, receiving and/or decoding at least part of ITS messages at and/or between said plurality of ITS-Ss, wherein each of ITS-Ss comprises at least one sensor arranged to perceive, for example in the form of objects and/or free-space, in at least one geographical area within said traffic environment, is arranged to act both as a sender ITS-S and a receiver ITS-S, and is arranged to use, as said ITS messages, collective perception messages (CPMs) containing at least information about the perception within a traffic environment.