Secure authenticated distance measurement

  • US 9,590,977 B2
  • Filed: 08/05/2016
  • Issued: 03/07/2017
  • Est. Priority Date: 07/26/2002
  • Status: Active Grant
First Claim
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1. A receiving device comprising:

  • means for providing a certificate identifying said receiving device;

    means for receiving a first signal from a first device after the first device determines, based on information obtained from the certificate, that the receiving device is compliant with a set of compliance rules;

    means for generating a second signal after receiving the first signal, wherein said second signal is derived using a secret known by the first device;

    means for transmitting said second signal;

    means for generating a secure authenticated channel using the secret; and

    means for receiving over the secure authenticated channel a protected content after the first device determines that the second signal is derived using the secret and a time between a transmission of the first signal and receipt of the second signal by the first device is less than a predetermined time.

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