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System and Method of Secure Data Exchange through Liquid Crystal Display

IP.com Disclosure Number: IPCOM000131859D
Publication Date: 2005-Nov-21
Document File: 1 page(s) / 114K

Publishing Venue

The IP.com Prior Art Database

Abstract

To make Bluetooth over-the-air communication between mobile devices and accessory units more secure, we need to choose very long P2P messaging codes (Bluetooth pairing P2P messaging code and any other encryption keys). These P2P messaging codes need to be the same on the mobile device and the accessory device. In addition, the P2P messaging code needs to be changed often (once a day or more) for security reasons. This requires the accessory unit to have a keypad and the user to type in new, long P2P messaging codes on the accessory device every time the P2P messaging codes are changed. This may be cumbersome and inconvenient. The proposed solution attempts to address these problems. The proposed solution utilizes a blinking dot on the mobile device display (i.e., LCD). By blinking a dot on the LCD and reading the LCD data with a photo sensor on the accessory unit that is held in proximity to the LCD, we can transfer a long P2P messaging code securely. This type of P2P messaging exchange does not require a keypad on the accessory unit and opens up for choosing a long P2P messaging code very often. Furthermore, for a secure transaction, the accessory unit needs to be designed in a way that it covers the mobile device. A proposed circuit diagram to facilitate this is as follows:

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SECURE DATA EXCHANGE THROUGH LCD

System and Method of Secure Data Exchange through Liquid Crystal Display

Disclosed Anonymously

To make Bluetooth over-the-air communication between mobile devices and accessory units more secure, we need to choose very long P2P messaging codes (Bluetooth pairing P2P messaging code and any other encryption keys). These P2P messaging codes need to be the same on the mobile device and the accessory device.

In addition, the P2P messaging code needs to be changed often (once a day or more) for security reasons. This requires the accessory unit to have a keypad and the user to type in new, long P2P messaging codes on the accessory device every time the P2P messaging codes are changed. This may be cumbersome and inconvenient.

The proposed solution attempts to address these problems. The proposed solution utilizes a blinking dot on the mobile device display (i.e., LCD). By blinking a dot on the LCD and reading the LCD data with a photo sensor on the accessory unit that is held in proximity to the LCD, we can transfer a long P2P messaging code securely.

This type of P2P messaging exchange does not require a keypad on the accessory unit and opens up for choosing a long P2P messaging code very often. Furthermore, for a secure transaction, the accessory unit needs to be designed in a way that it covers the mobile device.

A proposed circuit diagramĀ  to facilitate this is as follows: