Wireless Power Transfer Authentication With Certificate Revocation Handling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless power transfer systems lack effective authentication mechanisms to establish trust between devices before power transfer, which can lead to security vulnerabilities and inefficient power transfer.
Innovation Solution
Implementing a certificate-based authentication process using public-key cryptography, where devices verify each other's certificates and respond to challenge messages to establish trust, with mechanisms for certificate revocation and replacement lists to manage compromised keys.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If certificate-based authentication is implemented, then security and trust between devices is improved, but device complexity and authentication overhead increase
Solution Approach 1:
Authentication certificates and trust relationships are established before power transfer begins. The initiator device obtains and verifies the responder device's certificate in advance, ensuring security is built into the system beforehand rather than added during operation.
Solution Approach 2:
A certificate authority acts as an intermediary that issues and manages digital certificates for devices. This mediator enables trust between devices without requiring them to directly verify each other's security credentials, simplifying the authentication process.
2Reliability
If challenge-response authentication is performed, then device identity verification is improved, but power transfer time and efficiency are reduced
Solution Approach 1:
The challenge-response authentication is performed during the initial connection phase before power transfer begins. This ensures identity verification is completed in advance, allowing power transfer to start immediately without repeated authentication delays.
Solution Approach 2:
Authentication is performed periodically at key stages: initial connection, and optionally at power level transitions. This periodic verification maintains security while minimizing overall time loss by concentrating authentication at necessary intervals rather than continuously.
3Reliability
If certificate revocation lists are maintained, then security against compromised certificates is improved, but system complexity and memory requirements increase
Solution Approach 1:
The certificate authority serves as an intermediary that maintains and distributes revocation lists. Initiator devices obtain these lists from the CA, eliminating the need for each device to independently track and manage revocation information, thus reducing individual device complexity.
Solution Approach 2:
The certificate authority performs multiple functions: issuing certificates, revoking certificates, and providing revocation lists. This universal approach to certificate management centralizes complexity in a single entity rather than distributing it across all devices in the system.
4Object-affected harmful factors
If authentication is performed before power transfer, then unauthorized access prevention is improved, but power transfer efficiency is reduced
Solution Approach 1:
Authentication is performed as a preliminary step before power transfer begins. By completing verification beforehand, the system ensures unauthorized devices cannot access power while allowing authenticated devices to transfer power immediately without repeated checks.
Solution Approach 2:
Authentication occurs periodically at defined stages rather than continuously during power transfer. The initiator verifies the responder's certificate initially, and may verify again at power level transitions, maintaining security while minimizing interruptions to the power transfer process.
Data Source
AI summary
A method for authentication for wireless power transfer which comprises: receiving an initial certificate signed using a private key associated with an intermediate certificate authority (CA) certificate; determining that the intermediate CA certificate is revoked; determining if a replacement certificate for the initial certificate exists; and if a replacement certificate for the initial certificate exists, trusting a wireless power transfer device associated with the initial certificate.