Secure Ranging Key Verification for URSK Synchronization
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Solution Overview
Problem
The Car Connectivity Consortium (CCC) Specification lacks clarity on triggers for secure ranging secret key refresh and recovery, leading to potential synchronization issues and corruption of pre-derived URSKs, affecting the reliability of secure ranging protocols.
Innovation Solution
Implement proactive verification and synchronization mechanisms for URSKs, including active and pre-derived URSK management, time-to-live (TTL) management, and secure element (SE) corruption checks to ensure timely detection and correction of URSK status and timers across devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If proactive verification and synchronization mechanisms are implemented for URSKs, then reliability of secure ranging operations is improved, but device complexity increases
Solution Approach 1:
The patent implements proactive verification mechanisms that check URSK status and synchronization before security issues arise. The system performs preliminary checks on URSK validity, TTL status, and synchronization state between devices, preventing corruption and failures before they occur rather than reacting after problems manifest.
Solution Approach 2:
The patent establishes feedback loops where devices continuously verify URSK synchronization status and exchange verification results. The system monitors URSK state, detects discrepancies between devices, and triggers re-synchronization actions based on the verification outcomes, creating a closed-loop control system that maintains reliability.
2Reliability
If URSK refresh and re-derivation processes are implemented, then security integrity is improved, but loss of time occurs due to key management operations
Solution Approach 1:
The patent performs preliminary verification of URSK status and TTL expiration before security breaches occur. By checking key validity and synchronization state in advance, the system can proactively refresh URSKs before they become compromised or expired, avoiding emergency re-derivation and reducing overall time loss.
Solution Approach 2:
The patent implements periodic verification and refresh of URSKs based on TTL management. Instead of continuous operations, the system checks URSK status at scheduled intervals and performs refresh operations periodically when needed, balancing security maintenance with minimizing disruption to normal operations.
3Reliability
If synchronization mechanisms for URSK status and timers are implemented, then reliability is improved, but use of energy increases due to additional communication and verification
Solution Approach 1:
The patent implements periodic synchronization of URSK status and TTL timers between devices rather than continuous communication. The system verifies synchronization at defined intervals and only exchanges data when necessary, reducing energy consumption compared to constant verification while maintaining reliable synchronization state.
Data Source
AI summary
A responder device, including: a wireless module operable for short-range communication; and processor circuitry coupled to the wireless module and operable to: generate a first query for an initiator device in a ranging area of the responder device to initiate a verification of whether an active secure-ranging secret key as stored within the initiator device complies with an active secure-ranging secret key as stored within the responder device; and receive a first query response including an indication of whether the active secure-ranging secret key as stored within the initiator device complies with the active secure-ranging secret key as stored within the responder device.