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System and method for communicating encrypted data

  • US 7,668,314 B2
  • Filed: 02/27/2006
  • Issued: 02/23/2010
  • Est. Priority Date: 03/30/2005
  • Status: Expired due to Fees
First Claim
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1. An encrypted data communication system for communicating an encrypted stream from a device at a transmitting end to a device at a receiving end, the encrypted stream being generated by encrypting a video stream with a start code which is a unique code,wherein the device at transmitting end includes:

  • an encryption processing unit for encrypting at least one part of the video stream, without the start code, by an exclusive-OR operation of a random number and at least one part of the video stream, anda transmitter for transmitting the encrypted stream including the video stream at least one part of which is encrypted without the start code, and the start code being not encrypted, and a synchronization marker which is arranged before or after the start code; and

    wherein the device at receiving end includes;

    a receiver for receiving the encrypted stream,a detector for detecting a sequence of the start code and the synchronization marker from the received encrypted stream to determine that the detected start code is valid, anda decryptor for decrypting the received video stream at least one of which is encrypted without the start code, based on a position at which the start code is detected.

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