Secure Wireless Controller Accessory Communication
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Solution Overview
Problem
Existing remote control systems for electronic devices lack adequate security measures to prevent unauthorized access and manipulation of accessory devices, particularly in scenarios where unauthorized devices can intercept and exploit communication between controllers and accessories.
Innovation Solution
Implementing secure wireless communication protocols that limit exposed information, using encrypted and signed data blocks for secure read and write operations, and employing timed write procedures to enhance security and prevent unauthorized operations on accessory devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the attribute database is exposed for controller access, then ease of operation is improved, but security is worsened as unauthorized devices can intercept and manipulate communications
Solution Approach 1:
The attribute database is segmented into multiple components: service identifiers, characteristic identifiers, and characteristic values. During pairing, only service and characteristic identifiers are exposed in clear text, while characteristic values remain encrypted. This segmentation allows controllers to discover and access accessory functionality without exposing sensitive operational data to unauthorized devices.
Solution Approach 2:
The patent changes the encryption parameter state dynamically. During the pairing process, encryption is temporarily relaxed to allow database exposure for discovery purposes. Once pairing is complete, encryption parameters are strengthened so that only paired controllers can decrypt and access characteristic values, while unpaired devices see only encrypted data.
2Reliability
If encryption is applied to all database transmissions, then security is improved, but device complexity increases due to key management requirements
Solution Approach 1:
The patent extracts the cryptographic key management complexity from the attribute database access process. Instead of encrypting all database transmissions, only characteristic values are encrypted using session keys established during pairing. Service and characteristic identifiers remain in clear text, allowing controllers to access the database structure without requiring complex key management for every access operation.
Data Source
AI summary
A controller and an accessory controllable by the controller can communicate using secure read and write procedures. The procedures can include encrypting identifiers of accessory characteristics targeted by a read or write operation as well as any data being read or written. The procedures can also include the accessory returning a cryptographically signed response verifying receipt and execution of the read or write instruction. In some instances, a write procedure can be implemented as a timed write in which a first instruction containing the write data is sent separately from a second instruction to execute the write operation; the accessory can disregard the write data if the second instruction is not received within a timeout period after receiving the first instruction.