Cryptography – Communication system using cryptography – Wireless communication
Reexamination Certificate
2011-03-15
2011-03-15
Chen, Shin-Hon (Department: 2431)
Cryptography
Communication system using cryptography
Wireless communication
C380S264000, C380S278000
Reexamination Certificate
active
07907733
ABSTRACT:
Disclosed is a traffic encryption key (TEK) management method for automatically generating a TEK for a multicast or broadcast service by a base station to periodically update a TEK used by a subscriber station. The base station transmits the first Key Update Command message for updating a group key encryption key (GKEK) for encrypting the TEK and the second Key Update Command message for updating the TEK to the subscriber station to update the TEK. The base station establishes an M & B TEK Grace Time which is different from a TEK Grace Time established by the subscriber station, transmits the first message including a new GKEK to the subscriber station through a primary management connection before the M & B TEK Grace Time, and transmits the second message including a new TEK encrypted with the new GKEK thereto through a broadcast connection after the M & B TEK Grace Time.
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Chang Sung-Cheol
Cho Seok-Heon
Yoon Chul-Sik
Chen Shin-Hon
Electronics and Telecommunications Research Institute
Hanaro Telecom. Inc.
KT Corporation
KT-Freetel Co., Ltd.
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