Redactable Blockchain Authentication for Cross-Authority Vehicle Credentials

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Solution Overview

Problem

Existing vehicle communication systems face security risks due to reliance on single trusted authorities, which create a single point of failure and are vulnerable to tampering and forgery, and lack effective methods to manage expired or illegal data on blockchains.

Innovation Solution

A cross-trusted authority authentication and message publishing method using a redactable blockchain, incorporating elliptic curve cryptography, chameleon hash functions, and physical unclonable functions (PUFs) to ensure secure, distributed authentication and data management, allowing trusted authorities to jointly maintain and update vehicle credentials and session keys.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a single trusted authority is used for vehicle authentication, then the authentication process is simple and centralized, but the system has a single point of failure and is vulnerable to security risks

Engineering Contradiction:

Improveauthentication process simplicityVSAvoidsystem security

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent divides the single trusted authority into multiple trusted authorities that jointly maintain the blockchain network. Each authority holds a portion of the system key, and no single authority can compromise the entire system. This segmentation eliminates the single point of failure while maintaining distributed authentication capabilities.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent combines multiple trusted authorities into a unified blockchain network where they collectively perform authentication functions. The authorities work together through consensus mechanisms, merging their computational resources and security credentials to provide both simplicity and reliability in the authentication process.

Inventive Principle:

Principle #5Merging (Combining)

2Stability of the object's composition

If traditional blockchain is used to store vehicle credentials, then data integrity is maintained, but expired or illegal data cannot be effectively removed from the blockchain

Engineering Contradiction:

Improvedata integrityVSAvoiddata management flexibility

Core Design Contradiction:

Stability of the object's compositionVSAdaptability or versatility

Solution Approach 1:

The patent applies redaction technology that allows selective modification of specific data elements within blockchain blocks while preserving the overall block structure and hash chain integrity. This enables local updates to expired or illegal credentials without compromising the global data integrity of the blockchain, providing both stability and adaptability.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent changes the immutability parameter of the blockchain by introducing controlled redaction capabilities. Through cryptographic mechanisms, the system allows authorized modification of specific parameters (credential data) while maintaining other critical parameters (block structure, hash links), enabling flexible data management alongside data integrity.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If vehicle identity information is stored on blockchain for verification, then authentication security is improved, but vehicle privacy is exposed

Engineering Contradiction:

Improveauthentication securityVSAvoidvehicle privacy

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The patent extracts sensitive personal identity information from the blockchain storage and keeps it only in local vehicles' secure elements. The blockchain stores only verification credentials and public keys, separating sensitive data from public verification data. This extraction maintains authentication security while protecting vehicle privacy by preventing exposure of personal identity information.

Inventive Principle:

Principle #2Taking out (Extraction)

4Reliability

If multiple trusted authorities jointly maintain the blockchain, then system security is improved, but the complexity of key management and coordination increases

Engineering Contradiction:

Improvesystem securityVSAvoidkey management complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent creates a universal key management system where multiple trusted authorities use the same cryptographic protocols and procedures for key generation, distribution, and updates. This multi-functional approach allows different authorities to perform identical security functions through standardized processes, reducing operational complexity despite the increased number of authorities.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS20260012350A1Cross trusted authorities identity authentication and message publishing method based on redactable blockchain

Publication Date: 2026.01.08 HANGZHOU NORMAL UNIVERSITY

AI summary

The invention discloses a cross trusted authority identity authentication and message publishing method based on redactable blockchain, adopts a redactable blockchain based on chameleon hash function to replace the traditional blockchain, and the trusted authority can use the private key of the chameleon hash function to edit the block content on the blockchain, so that only legal, valid and timely information is stored on the blockchain. In addition, the trusted authority can also edit the vehicle authentication information stored on the blockchain, easily updating the vehicle information credentials or revoking the information credentials of illegal vehicles. In the process of authentication and key negotiation, cryptography tools are used to ensure the confidentiality, integrity and availability of messages, and can effectively resist various known attacks.