Patent ID: 8687807
Filing Date: 2014-04-01
Classification: H04L,H04N

Abstract:
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.