Security arrangement for downloadable cable television converter

Details Security arrangement for downloadable cable television converter Security arrangement for downloadable cable television converter

1986-06-16

1987-12-08

Buczinski, Stephen C.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

358349, 380 13, 380 49, 455 4, H04N 7167, H04L 900

Patent

active

047122390

ABSTRACT:
A method and apparatus prevent unauthorized programming viewing via a downloadable cable television converter. A booter checksum is computed from data contained in a downloaded booter image. A valid checksum is extracted from tag data associated with a scrambled program signal transmitted on the cable system. The booter checksum is compared to the extracted valid checksum. If the booter checksum and valid checksums match, a descrambler is enabled to descramble the scrambled program signal. If the checksums do not match, the descrambler is not enabled. In this manner, a pirate is prevented from downloading a false booter image to defeat the integrity of the converter.

REFERENCES:
patent: 4054911 (1977-10-01), Fletcher et al.
patent: 4542407 (1985-09-01), Cooper et al.
patent: 4558464 (1985-12-01), O'Brien

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