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Method for exchanging strong encryption keys between devices using alternate input methods in wireless personal area networks (WPAN)

  • US 9,401,902 B2
  • Filed: 01/16/2014
  • Issued: 07/26/2016
  • Est. Priority Date: 12/27/2006
  • Status: Expired due to Fees
First Claim
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1. One or more non-transitory, machine-readable media comprising a plurality of instructions stored thereon that, when executed by a computing device, causes the computing device to:

  • communicate, in a key exchange mode, with another computing device via an in-band transmission channel;

    negotiate, via the in-band transmission channel, with the another computing device to determine which computing device will generate an encryption key;

    generate the encryption key using audible background noise as a random seed to a random number generator in response to a determination that the computing device is to generate the encryption key;

    generate a cryptographic picture based on the encryption key, wherein the cryptographic picture includes the encryption key embedded in the cryptographic picture;

    transmit the encryption key to the another computing device, wherein to transmit the encryption key to the another computing device comprises to display the cryptographic picture on a display of the computing device such that the cryptographic picture is visible to the another computing device;

    determine whether the encryption key has been successfully validated by the another computing device based on the cryptographic picture; and

    enable the computing device to automatically accept communications from the another computing device over the in-band transmission channel in response to a determination that the encryption key has been successfully validated.

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