Unauthorized Connection Detection in Battery Charging Systems
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Solution Overview
Problem
Conventional techniques fail to detect unauthorized charge/discharge devices with introduced cryptographic modules, leading to potential performance issues, safety risks, and information leakage.
Innovation Solution
An unauthorized connection detecting device that obtains time information from a first charge/discharge device and compares it with expiration date information from a second device to determine if the second device is unauthorized, using public key certificates and certificate revocation lists to validate authenticity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional authentication techniques using cryptographic modules are used, then device security is improved, but unauthorized devices with introduced cryptographic modules cannot be detected
Solution Approach 1:
The patent applies preliminary action by obtaining time information (issuing date of certificate or CRL) from a first charge/discharge device before connecting to the second device. This pre-obtained time reference enables subsequent validation of the second device's certificate expiration date, allowing detection of unauthorized devices that have introduced cryptographic modules. The preliminary acquisition of trustworthy time data from a known authentic device resolves the contradiction by providing a baseline for detecting forged or unauthorized cryptographic credentials.
2Reliability
If cryptographic module authentication is implemented, then connection security is improved, but devices with introduced cryptographic modules are incorrectly accepted as authentic
Solution Approach 1:
The patent implements feedback by comparing the time information (issuing date) obtained from a first authentic charge/discharge device with the expiration date information from a second device. This feedback mechanism reveals inconsistencies in unauthorized devices that have introduced cryptographic modules, as their certificate time information will not match the expected temporal relationship. The feedback loop validates whether the second device is truly authentic or has improperly introduced cryptographic modules, thereby maintaining connection security while improving authentication robustness.
3Measurement precision
If certificate validation based on current time is used, then authentication accuracy is improved, but time synchronization issues cause false unauthorized device detection
Solution Approach 1:
The patent uses an intermediary approach by obtaining time information from a first charge/discharge device that serves as a reference point, rather than relying on the local current time of each device. This intermediary time reference (issuing date of certificate or CRL from an authentic device) mediates the authentication process, eliminating synchronization issues between devices. By comparing the second device's certificate expiration date against this intermediary time reference, the system achieves both high authentication accuracy and detection stability, avoiding false positives from time synchronization problems.
Data Source
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Figure 3A~3B
AI summary
An unauthorized connection detecting device (100) which detects an unauthorized charge/discharge device includes: a time information obtaining unit (110) obtaining, as time information, information from a first charge/discharge device (20), the information indicating at least one of an issuing date of a first certificate which is a public key certificate and an issuing date of a certificate revocation list held by the first charge/discharge device (20); an expiration date obtaining unit (120) obtaining expiration date information from a second charge/discharge device (30), the expiration date information indicating an expiration date of a second certificate which is a public key certificate held by the second charge/discharge device (30); and an unauthorization detecting unit (130) detecting whether or not the second charge/discharge device (30) is the unauthorized charge/discharge device by comparing the time information with the expiration date information.