Key update method and apparatus thereof

Details Key update method and apparatus thereof Key update method and apparatus thereof

2007-05-18

2011-12-20

Moorthy, Aravind (Department: 2492)

Cryptography

Key management

Having particular key generator

C380S255000, C380S278000, C380S279000, C713S150000, C713S168000, C713S171000

Reexamination Certificate

active

08081754

ABSTRACT:
A key update method and a key update apparatus are provided. The method includes storing data in a database of an update server, the data having an encoded updated node key in response to a node key update for a group; selecting necessary data, from among the data having the encoded updated node key, to calculate a key immediately prior to when the member is switched to the online mode, and generating member update data; and performing a key update with respect to the member using the member update data in a device corresponding to the member which has switched from the offline mode to the online mode.

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Baag, et al, “The Study of Efficient Rekey Interval Allotment for Minimum Cost on Secure Multicast”Journal of Industrial Technology, No. 21 A, 2001, Kangwon National University, Korea, pp. 123-128.

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