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Method for providing a secure communication between two devices and application of this method

  • US 6,385,317 B1
  • Filed: 04/02/1999
  • Issued: 05/07/2002
  • Est. Priority Date: 04/03/1996
  • Status: Expired due to Term
First Claim
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1. A method for providing a secure communication between two devices in a decoder for a pay TV system, wherein said decoder comprises a conditional access module (CAM) and a smart card (SC), wherein a first device generates a random key (Ci) and transfers said key to a second device in a first message encrypted using a public key, wherein said second device decrypts the first encrypted message by means of a corresponding secret key to obtain said random key of a corresponding secret key to obtain said random key (Ci), wherein after decrypting said encrypted message, said second device first returns said random key (Ci) in a second encrypted message with an authentication to said first device, wherein said random key (Ci) is used to encrypt and decrypt transmissions from said second to said first device.

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