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Full text of "USPTO Patents Application 09870801"

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02951291 **lmage available** 
ENCIPHERMENT KEY DELIVERY SYSTEM 


Pub. No.: 01-248891 [JP 1248891 A ] 
Published: October 04, 1 989 (1 989 1 004) 
Inventor: UMEMOTO AKJTO 
WATANABE HIROSH1 
Applicant: KONDEISHIYONARU AKUSESU TECHNOL KENKYUSHO KK [000000] (A 
Japanese Company or Corporation), JP (Japan) 

NEC CORP [000423] (A Japanese Company or Corporation), JP (Japan) 

Application No.: 63-077296 [JP 8877296] 

Filed: March 30, 1988 (19880330) 

International Class: [ 4 ] H04N-007/1 67 

JAPIO Class: 44.6 (COMMUNICATION ~ Television) 

Journal: Section: E, Section No. 867, Vol. 13, No. 594, Pg. 150, December 27, 1989 (19891227) 
ABSTRACT 

PURPOSE: To instantaneously deliver work keys to all receivers and to shorten the delivery time of 
the work keys at long cycles by composing inherent keys of common keys for the all receivers and 
different keys at every receiver, giving the work keys ciphered with the common keys for the 
receivers to the all receivers, and transmitting individual information other than the work key with 
enciphering by means of the different key at every receiver. 

CONSTITUTION: In a ciphering device 1 03, common individual information KJ0 including a work 
key Kw is ciphered by a KmO, and converted into a signal eKJO. Individual information KJp 
different at every receiver is ciphered by a key KMp different at every receiver, and converted into a 
signal eKJp. On the other hand, on a receiving side, the transmitted signals eKJO and eKJp are 
decoded by the common key KmO and the key Kmp different at every receiver in a decoder 106, and 
KJp and KJ0 are taken off. Further, the individual information KJp and program information BJ are 
compared by a comparator/collator 108. As a result, only when contract conditions correspond to 
watching permitting conditions, a switch 1 09 is conducted, and a scrambler key ks is outputted. 


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