Locking Device Random Time Delay Policy
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Solution Overview
Problem
Conventional electronic locks with fixed anti-theft time delay mechanisms become predictable and are compromised by custodians who do not wait for the fixed time to expire, requiring reprogramming to change the delay time, which is logistically challenging.
Innovation Solution
Implementing a locking device with a random time delay policy based on threat level, custodian characteristics, geographic location, and time of day, requiring a second credential within a specified time period after the initial credential validation, ensuring physical presence and reducing predictability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed time delay mechanism is used, then the locking device provides additional time for emergency personnel to arrive, but the fixed time becomes predictable and can be compromised by custodians
Solution Approach 1:
The patent transforms the static fixed time delay into a dynamic random time delay that varies with each activation. The system selects a delay period from a predefined range (e.g., 1-5 minutes) randomly, making the unlocking time unpredictable while still providing sufficient time for emergency response. This dynamic approach resolves the contradiction by maintaining security reliability through extended delay while eliminating predictability that enables compromise.
Solution Approach 2:
The patent changes the parameter of time delay from a fixed value to a variable random value within a specified range. By implementing random selection of delay periods (e.g., choosing between 1, 2, 3, 4, or 5 minutes), the system maintains the beneficial effect of extended response time while introducing variability that prevents custodians from predicting when the lock will unlock, thus resolving the security-reliability versus predictability contradiction.
2Reliability
If the fixed time delay is changed to improve security, then security reliability improves, but reprogramming the locking device becomes logistically challenging
Solution Approach 1:
The patent implements a system where the locking device automatically selects and adjusts its own time delay parameter without requiring external reprogramming. The device contains pre-programmed random delay ranges and autonomously selects from these ranges based on random selection, eliminating the need for manual reconfiguration. This self-service approach resolves the contradiction by improving security through variable delays while avoiding the logistical burden of reprogramming.
Solution Approach 2:
The system provides dynamic adaptability through random time delay selection without requiring physical reconfiguration. The locking device can change its operational parameters (delay time) dynamically during operation rather than requiring static reprogramming, thus improving security while maintaining ease of operation and avoiding reprogramming complexity.
3Reliability
If custodians leave the locking device unattended after validation, then the fixed time delay mechanism becomes effectively compromised, but requiring constant monitoring reduces operational efficiency
Solution Approach 1:
The patent uses dynamic random time delay to prevent the compromise that occurs with fixed delays. Since the delay period varies randomly, custodians cannot predict when the lock will unlock and thus cannot leave the device unattended with confidence that it will unlock automatically. This maintains anti-theft reliability while allowing custodians to perform other tasks, as they must simply wait for the random period rather than actively monitor the device.
Solution Approach 2:
By changing the time delay parameter from fixed to random, the system eliminates the vulnerability where custodians could exploit predictable timing. The variable delay ensures that even if custodians leave the area, the unpredictable unlock time prevents automatic compromise, maintaining security while allowing greater operational freedom and efficiency.
Data Source
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AI summary
A locking device employs improved lock management techniques based on time delay polices that use a random period of time. The locking device receives a first credential of a custodian, validates the first credential and determines a random period of time based upon a time-delay policy when the first credential is validated. The locking device executes a lock release protocol upon expiration of the random period of time.