Method for subscribing service and distributing encryption...

Details Method for subscribing service and distributing encryption... Method for subscribing service and distributing encryption...

2004-06-14

2009-08-04

Truong, Thanhnga B (Department: 2435)

Cryptography

Video cryptography

Video electric signal modification

C380S231000, C380S277000, C705S030000, C705S040000

Reexamination Certificate

active

07570763

ABSTRACT:
A method for subscribing a service and distributing encryption key based on public-key encryption algorithm in a digital CATV system are disclosed. In accordance with an aspect of the present invention, there is provided a method including the steps of: a) generating a charged service application message; b) generating a session connection request message, signing based on a digital signature scheme with appendix on the session connection request message and transmitting to the head-end; c) generating a symmetric-based session key, signing a digital signature on the key, encrypting based on a public-key of the subscriber, transmitting the session key to the subscriber; decrypting the session key message, verifying the digital signature, extracting the session key from the session key message and storing at a Condition Access Module; and d) signing a digital signature on the charged service request message, encrypting using the extracted session key and transmitting to the head-end.

REFERENCES:
patent: 5862299 (1999-01-01), Lee et al.
patent: 6330670 (2001-12-01), England et al.
patent: 6577734 (2003-06-01), Etzel et al.
patent: 2004/0139012 (2004-07-01), Koskinen et al.
patent: 1997-64233 (1997-09-01), None
patent: 2003-0068395 (2003-08-01), None

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