Network Lock Cryptographic Engagement Verification
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Solution Overview
Problem
Network-enabled door locks lack a reliable method to verify if the door is truly locked, leading to situations where a door may be thought locked when it is actually open, either accidentally or maliciously.
Innovation Solution
A network-enabled door lock system that uses sensors and a door status model to accurately determine its locked or unlocked status, incorporating cryptographic techniques for enhanced security and preventing hacking, with components like deadbolt and strike plate communicating securely using asymmetric or symmetric keys and nonces to confirm mechanical engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If network-enabled door locks use simple locking mechanisms, then ease of operation is improved, but reliability of lock status verification deteriorates
Solution Approach 1:
The patent implements feedback mechanisms where the door lock system continuously monitors and reports its own status through multiple sensors (magnetic sensors, contact switches, Hall effect sensors) that detect whether the deadbolt is extended, the door is closed, and the strike plate is engaged. This feedback loop provides real-time status verification to the control system, ensuring reliable lock status detection while maintaining simple operation through automated monitoring.
Solution Approach 2:
The patent employs a hierarchical verification system where multiple nested levels of status checking are performed: first checking if the deadbolt is extended, then verifying if the door is closed, and finally confirming if the strike plate is engaged. This nested approach layers multiple verification steps within each other, providing comprehensive reliability without complicating the user interface.
2Reliability
If network-enabled door locks add verification mechanisms, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent designs components with multiple functions to reduce overall system complexity. For example, the control system serves as both the locking mechanism controller and the status verification system. Sensors are integrated into existing door lock components rather than being separate additions. The strike plate serves both as a mechanical engagement point and as a reference for magnetic field detection.
Solution Approach 2:
The patent combines multiple verification functions into unified components. The control system integrates deadbolt control, status monitoring, and network communication functions. Magnetic sensors are positioned to simultaneously detect deadbolt position and door closure status. The system merges mechanical verification (physical engagement) with electronic verification (sensor detection) into a coordinated verification process.
3Object-affected harmful factors
If cryptographic techniques are implemented for security, then security against hacking is improved, but device complexity increases
Solution Approach 1:
The patent implements cryptographic key exchange and authentication protocols before any locking or status reporting operations occur. The system pre-establishes secure communication channels between the door lock, mobile devices, and remote systems using asymmetric cryptography. This preliminary security setup prevents unauthorized access and ensures that subsequent operations are protected without requiring complex real-time cryptographic processing.
Solution Approach 2:
The patent uses cryptographic protocols as intermediaries to secure communication between the door lock system and external devices. Rather than implementing complex security measures directly in the lock hardware, the system employs standardized cryptographic libraries and protocols (such as TLS, SSL, or custom cryptographic handshakes) that act as mediators, providing security through well-tested external mechanisms rather than custom-built complex security systems.
Data Source
AI summary
A method of implementing a network-enabled secure door lock, comprising determining, at a first component of the lock, a nonce; wirelessly transmitting the nonce to a second component of the door lock, the first component and second component selectively mechanically engagable with one another to prevent relative movement between the first component and second component to prevent opening of a door; receiving, at the first component, a first message; using a cryptographic key associated with the second component and the nonce to validate the first message; and as a result of determining that the message is valid, transmitting a second message indicating that the first component and second component have become mechanically engaged with one another.