Digital Vehicle Key Hashing With Nonce-Based Collision Prevention
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Solution Overview
Problem
Existing digital vehicle key systems face collisions in key requests due to the lack of unique identification methods, leading to unauthorized access and security vulnerabilities.
Innovation Solution
Implementing a cryptographic hash method that includes a nonce (random value) on the key request to generate unique identifications, ensuring secure transmission of key requests and PINs through separate channels, and using a key management system to verify matching identifications for creating a new digital vehicle key.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a key request is transmitted from owner device to friend device without a nonce, then the key request can be processed, but collisions in key requests may occur leading to security vulnerabilities
Solution Approach 1:
A nonce is generated and transmitted to the friend device before the key request is processed. This preliminary action ensures that each key request is uniquely identifiable and prevents collisions, thereby improving security without significantly increasing complexity
Solution Approach 2:
The nonce acts as an intermediary element between the owner device and friend device. It is transmitted separately and used by the friend device to create a unique identification for the key request, preventing collisions while maintaining a relatively simple key request structure
2Reliability
If the same key request is transmitted from multiple devices, then key management can process the request, but unauthorized access may occur due to collision of key requests
Solution Approach 1:
Each device receives a unique nonce before transmitting a key request. This preliminary assignment of unique identifiers prevents unauthorized access through collision while maintaining ease of operation, as the nonce transmission is integrated into the existing key management flow
Solution Approach 2:
The nonce provides local uniqueness to each key request transmission. By assigning a unique identifier to each device's key request, the system prevents collisions and unauthorized access without requiring complex changes to the overall key management operation
3Measurement precision
If cryptographic hash function is applied only to key request without nonce, then identification can be generated, but unique identification cannot be ensured leading to collision
Solution Approach 1:
A nonce is generated and transmitted to the friend device before the key request is processed. This preliminary action ensures that each key request is uniquely identifiable and prevents collisions, thereby improving security without significantly increasing complexity
Solution Approach 2:
The nonce acts as an intermediary element between the owner device and friend device. It is transmitted separately and used by the friend device to create a unique identification for the key request, preventing collisions while maintaining a relatively simple key request structure
Data Source
AI summary
A method for creating a new digital vehicle key for a motor vehicle includes independently determining an identification of a key request for the new digital vehicle key on the part of an owner device and on the part of a friend device. The identification is determined in each case by a cryptographic hash function with respect to the key request. It is proposed to determine the hash function additionally with respect to the nonce selected by the owner device and to transmit the nonce separately from the key request to the friend device. The identifications are transmitted to a key management, which provides the new vehicle key if the identifications match each other.