Secure video decoder system

Details Secure video decoder system Secure video decoder system

1990-07-30

1991-05-21

Wallace, Linda J.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 21, H04N 7167

Patent

active

050181971

ABSTRACT:
A video decoder includes an application specific integrated circuit (ASIC) that has the decoder address and a secure decryption key stored in a one-time-programmable memory. Encrypted messages are received and selectively supplied to a packet decrypter and to a video decrypter based upon the location of bits in the message string. The packet decrypter is responsive to a flag in the packet data for utilizing a secure key or a unsecure key for decryption of the packet data. The information derived from the secure decryption and the secure key itself are never available (or ascertainable) outside of the ASIC. Only information concerning the unsecure key is available outside of the integrated circuit.

REFERENCES:
patent: 4613901 (1986-09-01), Gilhousen et al.
patent: 4751732 (1988-06-01), Kamitake

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