Method and apparatus for updating a group key
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United States of America Patent
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Feb 12, 2013
Grant Date -
Mar 27, 2008
app pub date -
Jun 28, 2007
filing date -
Sep 27, 2006
priority date (Note) -
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status (Latency Note)
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Abstract
A method and apparatus for updating a group key of a group corresponding to a binary tree are provided. The method includes updating keys of leaf nodes that correspond to new members, in response to a join of at least two new members joining the group; determining whether both of two child nodes of a single ancestor node are updated when updating a key of the single ancestor node of the leaf nodes; establishing one of the two child nodes as an update use node when both the two child nodes are updated; and updating a key of the ancestor node using the updating node. Thus, the group key may be effectively updated with respect to multi-join.
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