Encryption communications system

Details Encryption communications system Encryption communications system

2008-06-19

2011-11-01

Reza, Mohammad (Department: 2436)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

C713S158000, C380S202000, C380S232000, C380S241000, C380S262000

Reexamination Certificate

active

08051284

ABSTRACT:
A system structured from a management device, a content key distribution device and a plurality of terminals suppresses the data volume of a terminal revocation list (TRL). The management device generates and transmits a TRL formed from data that expresses terminal IDs of all terminals to be invalidated, by only a value and a position of a common bit string in the IDs, to the content key distribution device. Each terminal holds a terminal ID that includes a manufacturer ID and a serial number, and requests the distribution of a content key by sending the terminal ID to the content key distribution device. The content key distribution device refers to the TRL, judges whether the terminal ID transmitted from the terminal is that of an invalidated terminal, and if negative, encrypts and transmits the content key to the terminal.

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