Controller Pre-calculates Encryption for Passive Entry
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Solution Overview
Problem
Existing passive entry and start systems experience delays due to the time required for cryptographic calculations in authenticating remote identification devices, leading to perceived hesitation in system response.
Innovation Solution
A controller calculates and saves encryption for each remote identification device during idle transmission time, allowing for immediate encryption generation upon receipt of a response transmission, eliminating the need for real-time calculation and reducing overall system response time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cryptographic calculations are performed in real-time upon receipt of response transmission, then authentication security is maintained, but system response time increases
Solution Approach 1:
The controller performs cryptographic calculations for all authorized remote devices in advance and stores the encrypted messages in memory. When a response transmission is received, the pre-calculated encryption is immediately retrieved and applied, eliminating real-time calculation delays while maintaining security.
Solution Approach 2:
The system creates copies of encrypted authentication messages for each authorized remote device and stores them in the controller's memory. These copied encryption values can be rapidly deployed without performing new cryptographic operations, significantly reducing authentication time.
2Ease of operation
If multiple authentication devices are authorized for a single vehicle, then user convenience is improved, but authentication processing complexity increases
Solution Approach 1:
The controller consolidates authentication data for multiple remote devices into a single memory structure. By maintaining a centralized list of pre-calculated encryptions for all authorized devices, the system simplifies the authentication process despite supporting multiple key fobs, reducing processing complexity compared to handling each device separately.
Data Source
AI summary
A passive entry and start system includes a controller that calculates the cryptology required for each remote identification device during idle transmission time to reduce overall system actuation time.