CWUSB Adapter Numeric Association via Host Display
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Solution Overview
Problem
The numeric association method in Certified Wireless USB 1.0 requires devices to display numbers, which is not feasible for all types of USB devices, and lacks a defined method for manual association, making it difficult for devices without display capabilities to establish a secure connection.
Innovation Solution
The method involves using a CWUSB adapter with a frame buffer to generate and display numeric information for numeric association, and allows for manual entry of the connection key in the case of manual association, utilizing existing display capabilities and additional connection methods to facilitate secure communication between hosts and devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If numeric association method is used, then secure communication can be established, but devices without display capabilities cannot complete the association process
Solution Approach 1:
Instead of requiring the device to display numbers for user confirmation, the patent inverts the approach by having the host computer display the connection key and CDID on its own display, then allowing the user to manually enter these values on the device. This resolves the contradiction by making the association process accessible to devices without display capabilities while maintaining secure communication through the same numeric association protocol.
Solution Approach 2:
The patent introduces manual entry as an intermediary method between automatic numeric association and secure communication establishment. By allowing users to manually type in the connection key and CDID that are displayed on the host computer, the system bridges the gap between devices that can and cannot display information, enabling universal compatibility while preserving security.
2Extent of automation
If display capability is required for numeric association, then association process can be automated, but devices without displays cannot be associated
Solution Approach 1:
The patent makes the association system universal by supporting multiple association methods: automatic numeric association for devices with display capabilities, and manual association for devices without displays. The host computer's display serves multiple functions - displaying connection information for both automatic and manual association processes, thereby expanding the system's adaptability across different device types.
Solution Approach 2:
The patent inverts the traditional approach where the device must display information for association. Instead, the host computer displays the connection key and CDID, and the user manually enters them on the device. This inversion eliminates the requirement for device display capabilities while maintaining automated security key generation and exchange, resolving the contradiction between automation and compatibility.
3Adaptability or versatility
If manual association is implemented, then devices without displays can connect, but user input load increases
Solution Approach 1:
The patent applies partial automation to the manual association process. While the user must manually enter the connection key and CDID, the system automatically generates these values on the host computer and displays them for copying. This partial automation reduces the user's burden compared to completely manual processes, as the user only needs to transcribe displayed values rather than generate or remember complex keys, thereby improving ease of operation while maintaining broad device compatibility.
Data Source
AI summary
Certified Wireless USB 1.0 (CWUSB) defines two different types of association: cable association and numeric association. In the numeric association, the CWUSB host and device use a specific protocol to exchange the security information. At final stage of this information exchange, both host and device need to display a number asking user's feedback. Once this is done, both host and device will be able to generate the connection key as the shared secret for the following secured communication. One problem of this numeric association method is that device needs to be able to display the numbers. For certain class of device that has capability to display an image, there is a natural way to add this function to them. A method for this class of devices is described. Another kind of association, which is not defined in the CWUSB 1.0, is manual association. User needs only to manually type in the Connection Key coming from the CWUSB device. There are many ways to delivery the key, but it is very easy for device that can display an image.