SCMS Activation Codes for CRL Bandwidth Reduction
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Solution Overview
Problem
The large-scale deployment of V2X technologies faces challenges in ensuring the security and privacy of communications, particularly in authenticating legitimate messages and preserving the anonymity of honest users.
Innovation Solution
The implementation of a Security Credential Management System (SCMS) that uses pseudonym certificates with short validity periods and linkage values to ensure message authentication and user privacy, while reducing the size and complexity of Certificate Revocation Lists (CRLs) through the use of activation codes and binary hash trees.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional Certificate Revocation Lists (CRLs) are used to revoke certificates in V2X communications, then security is improved by preventing misbehaving vehicles from using revoked certificates, but the bandwidth and computational costs increase due to the large size and frequent updates of CRLs
Solution Approach 1:
The patent segments the CRL into multiple smaller CRLs, each covering a specific time period or subset of revoked certificates. This segmentation reduces the size of each individual CRL that needs to be transmitted and processed, thereby reducing bandwidth and computational costs while maintaining security through comprehensive coverage of all revoked certificates across multiple segments
Solution Approach 2:
The patent implements preliminary action by pre-computing and caching CRL data on vehicles before they need to verify certificate revocation status. This allows vehicles to have local copies of CRL segments already available, reducing the need for frequent real-time downloads and computations during actual verification processes, thus lowering bandwidth and computational costs
2Ease of operation
If pseudonym certificates with short validity periods are used to preserve user privacy, then anonymity is improved by making it difficult to track honest users, but the frequency of certificate updates increases, leading to higher system complexity
Solution Approach 1:
The patent merges the certificate update process with the existing V2X communication infrastructure by integrating pseudonym certificate issuance and renewal into regular communication protocols. This consolidation leverages existing message exchanges and infrastructure components, reducing overall system complexity despite the frequent certificate updates required for privacy preservation
Solution Approach 2:
The patent introduces an intermediary certificate authority or trust anchor that manages pseudonym certificate issuance and revocation. This intermediary handles the complexity of frequent certificate updates, validity period management, and coordination between vehicles and infrastructure, thereby simplifying the overall system architecture while maintaining user privacy through short-lived pseudonyms
3Loss of energy
If the size of Certificate Revocation Lists is reduced to lower bandwidth costs, then bandwidth efficiency is improved, but the precision of revocation verification may be compromised
Solution Approach 1:
The patent segments the CRL into multiple smaller segments, each covering specific time periods or subsets of revoked certificates. This segmentation reduces the bandwidth required to transmit each individual CRL segment while maintaining verification precision through cryptographic mechanisms that allow vehicles to verify their certificates against the appropriate segment without needing the entire CRL at once
Solution Approach 2:
The patent adds a time dimension to CRL management by organizing revoked certificates into time-based segments. This dimensional approach allows the system to transmit only the relevant time-period segments to vehicles, reducing bandwidth costs while maintaining verification precision through time-aware certificate validation that checks certificates against the appropriate historical segments
Data Source
AI summary
According to some embodiments, systems and methods are provided for revoking one or more of a plurality of entities in a vehicular public-key infrastructure. The systems and methods balance privacy and efficiency by distributing activation codes according to various approaches, including a direct request approach, a fixed-size subset approach, and a variable-size subset approach.