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Cascading dynamic crypto periods

  • US 8,687,807 B2
  • Filed: 01/26/2011
  • Issued: 04/01/2014
  • Est. Priority Date: 01/26/2011
  • Status: Active Grant
First Claim
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1. A computer-implemented method for encrypting a data transmission stream using cascading dynamic crypto periods, the method comprising:

  • sending a first set of functions to a recipient device for use during a first crypto period, the first crypto period comprising a number of sub-crypto periods correlated to a number of functions included in the first set of functions, wherein the plurality of sub-crypto periods comprises at least a first sub-crypto period and a second sub-crypto period, and wherein the first sub-crypto period is a discrete portion of the first crypto period and the second sub-crypto period is a second discrete portion of the first crypto period;

    sending a first control word to the recipient device;

    encrypting the first sub-crypto period of the data transmission stream using the first control word;

    sending the first sub-crypto period of the encrypted data transmission stream to the recipient device;

    generating a first derived control word, wherein the first derived control word is generated by applying a first function from the first set of functions to retrieved data;

    encrypting the second sub-crypto period of the data transmission stream using the first derived control word; and

    sending the second sub-crypto period of the encrypted data transmission stream to the recipient device.

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