Association using USB video adapter
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.
1. An method of performing a manual association on a Certified Wireless Universal Serial Bus (CWUSB) device over a wireless communication channel comprising the steps of:
booting up the CWUSB device;
scanning for a host;
creating a Connection Device ID (CDID) and a Connection Key (CK);
enumerating a USB Display adaptor;
sending an image based on the CDID and CK to the USB Display adaptor;
manually entering the CDID and CK into the host by a user;
waiting for the user to notify the CWUSB device; and
continuing to perform further action;
thereby performing the manual association over the wireless communication channel.
2. The method of claim 1 , further comprising the steps of: forming a more secure communication channel by sending a newly created connection context across the wireless communication channel.
3. The method of claim 1 , wherein a host database located on the host stores values of the CHID, CDID and CK; and a device database located on the device stores values of the CHID, CDID and CK.
4. The method of claim 1 , whereby the wireless communication channel uses UWB modulation.
5. The method of claim 1 , wherein the host is a personal computer, PDA, cell phone, or intelligent TV.