Scrambled broadcast system

Details Scrambled broadcast system Scrambled broadcast system

1996-06-06

2000-05-23

Flynn, Nathan

Television

Format

Including additional information

348730, 348460, 348461, H04N 563, H04N 700, H04N 1100

Patent

active

060671211

ABSTRACT:
A scrambled broadcast system including a scrambler having a first generator for generating a first redundancy added data by adding a first redundancy data which changes over time to a message data, a second generator for generating a second redundancy added data by adding a second redundancy data which is obtained by executing a predetermined operation to the first redundancy added data generated in tho first generator, and an encryptor for executing a predetermined encrypting processing to the second redundancy added data generated in the second generator, a descrambler having a restoring unit for restoring the second redundancy added data by decrypting the encrypted data output from the decryptor, a discriminator for discriminating whether the operation operated in the second generator is realized to the second redundancy added data restored in the restoring unit or not and discriminating the rightness of the message data which is made by removing the first and the second redundancy data from the second redundancy added data.

REFERENCES:
patent: 4787085 (1988-11-01), Suto et al.
patent: 5005013 (1991-04-01), Tsukamoto et al.
patent: 5523794 (1996-06-01), Mankovitz et al.
patent: 5552833 (1996-09-01), Henmi et al.
patent: 5600573 (1997-02-01), Hendricks et al.
patent: 5635979 (1997-06-01), Kostreski et al.
patent: 5659366 (1997-08-01), Kerman
patent: 5661526 (1997-08-01), Hamamoto et al.

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