Method for conditional access in a DMTS/DOCSIS enabled set top box environment
OwnerGordon Thompsoninventor
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Abstract
The DOCSIS portion of a composite subscriber device is coupled to a video device. The DOCSIS portion ranges and obtain a symmetric session key generated and encrypted using the DOCSIS portion's private key, and broadcast from a central network device over a data channel. The session key is decrypted using the device's DOCSIS private key. The DOCSIS portion forwards the session key to a video control processor, which uses the session key to decrypt encrypted video control messages received by the video portion of the composite device over a video channle. The decrypted video control messages are used to process video content signals received at the composite subscriber device over the video channel.
Claims3
A method for delivering video control messages to a composite subscriber device having a video device coupled to a DOCSIS device, comprising:
- ranging the DOCSIS device with a central network device, wherein authentication protocols are used to ensure secure transmission of information;
- generating a symmetric session key at the central network device;
- encrypting the session key with a public key of the DOCSIS device;
- broadcasting the encrypted session key to the DOCSIS device over a first channel at a first frequency;
- decrypting the session key at the DOCSIS device using the DOCSIS device's private key;
- using the session key to decrypt encrypted video control messages;
- and
- using the decrypted video control messages to process video content signals received at the composite subscriber device over the second channel at the second frequency.
Dependencies are inferred from the claim text.