Secure data transfer on a handheld communications device
AssigneeBlackBerry Limited
InventorsMarc Drader, James Robinson, Michael Purdy
Life of this patent
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Abstract
A handheld communications device and method for transmitting an encryption key are provided. The method comprises: generating an encryption key via the data processor, the encryption key comprising a bit sequence; and varying an output of the display device over a period of time to transmit the encryption key from the handheld communications device by varying at least one of a sequence at least one of colour rendered on the display device or a sequence of brightness levels output by the display device.
Claims10
A method of initiating a secure communication from a handheld communications device, the handheld communications device comprising a display device having a backlight and a data processor in communication with the display device, the method comprising:
- generating an encryption key via the data processor, the encryption key comprising a bit sequence;
- varying a predominant colour in an image over a period of time in an output generated on the display device to transmit a first part of the encryption key from the handheld communications device:
- generating either a substantially solid white or gray image on the display;
- and
- varying a sequence of brightness levels output by the backlight to transmit a second part of the encryption key.
A method of initiating a secure communication from a
- handheld communications device, the handheld communications device comprising a display device, a backlight light for the display device and a data processor in communication with the display device, the method comprising:
- generating an encryption key via the data processor, the encryption key comprising a bit sequence;
- varying a sequence of brightness levels of the backlight over a period of time to transmit a first part of the encryption key from the handheld communications device;
- generating either a substantially solid white or gray image on the display device;
- and
- varying a sequence of brightness levels output by the backlight to transmit a second part of the encryption key.
Dependencies are inferred from the claim text.