Group subordinate terminal, group managing terminal, server,...

Details Group subordinate terminal, group managing terminal, server,... Group subordinate terminal, group managing terminal, server,...

2011-08-09

2011-08-09

Barron, Jr., Gilberto (Department: 2432)

Cryptography

Key management

Key distribution

C713S163000

Reexamination Certificate

active

07995766

ABSTRACT:
Provided is a group subordinate terminal in a key updating system that includes a server and a group of terminals including: a group managing terminal; and group subordinate terminals including the group subordinate terminal, the group subordinate terminal comprising: a group withdrawal request processing unit which transmits a group withdrawal request to the group managing terminal in response to an instruction to update its apparatus-unique key, the group withdrawal request requesting for withdrawal of the group subordinate terminal from the group; an update apparatus-unique key requesting unit which requests for another apparatus-unique key by transmitting to the server a group withdrawal certificate indicating that the withdrawal of the group subordinate terminal from the group of terminals is completed through invalidation of its group key; and an update processing unit which updates the apparatus-unique key held in an apparatus-unique key holding unit to the another apparatus-unique key obtained from the server.

REFERENCES:
patent: 2003/0126464 (2003-07-01), McDaniel et al.
patent: 2004/0096063 (2004-05-01), Carroni et al.
patent: 2007/0263983 (2007-11-01), Ando et al.
patent: 2000-101566 (2000-04-01), None
patent: 2003-273857 (2003-09-01), None

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