Tag generation method in broadcast encryption system

Details Tag generation method in broadcast encryption system Tag generation method in broadcast encryption system

2006-04-19

2011-11-08

Popham, Jeffrey D (Department: 2491)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Central trusted authority provides computer authentication

Reexamination Certificate

active

08055896

ABSTRACT:
A tag generation method for generating tags used in data packets in a broadcast encryption system is provided. The method includes detecting at least one revoked leaf node; setting a node identification (node ID) assigned to at least one node among nodes assigned node IDs at a layer0and to which the at least one revoked leaf node is subordinate, to a node path identification (NPID) of the at least one revoked leaf node at the layer0; generating a tag list in the layer0by combining the NPID of each of the at least one revoked leaf nodes at the layer0in order of increment of node IDs of the corresponding at least one revoked leaf nodes; and generating a tag list in a lowest layer by repeatedly performing the setting and generation operation down to the lowest layer.

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