Limited broadcast system

Details Limited broadcast system Limited broadcast system

1993-03-23

1994-09-27

Cain, David C.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 25, 380 4, H04K 100

Patent

active

053512944

ABSTRACT:
A method and apparatus for carrying out limited encipherment broadcast by generating a cipher key obtained from destination information added to service information are provided. An information service station transmits to each receiving station a random number, destination information for designating a destination station, and enciphered data obtained by enciphering service information by a common key generating by using the random number and destination information. An IC card at each receiving station which is provided in advance with a key generating function from the information service station, generates the common key by using the received random number and destination information only when it is confirmed from the destination information that the receiving station has a data redeption right, and deciphers the enciphered data by using the common key to obtain the original service information. The processing time required for generating the common key can be reduced because of a small amount of data to be used.

REFERENCES:
patent: 5218638 (1993-06-01), Matsumoto et al.

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