Cryptography – Key management – Key distribution
Reexamination Certificate
2005-11-23
2011-11-08
Orgad, Edan (Department: 2439)
Cryptography
Key management
Key distribution
C380S277000, C705S071000, C713S171000, C726S001000, C726S022000, C726S026000
Reexamination Certificate
active
08054973
ABSTRACT:
A broadcast encryption (BE) for acquiring an encryption key which is used to decrypt a session key by a node receiving services, with less computation overhead. A plurality of subgroups, each consisting of at least one of a plurality of nodes, are generated, and layers are formed according to a number of nodes which form the subgroup. Prime numbers are assigned to the subgroups not to overlap one another, and a subgroup at an upper layer is connected with a subgroup, which includes nodes forming the subgroup of the upper layer, at a lower layer. A prime number assigned to a subgroup at an upper layer, a prime number assigned to an unconnected subgroup at the same layer, and a prime number assigned to a subgroup at a lower layer, are re-assigned to each subgroup, and an encryption key which is generated from the re-assigned prime numbers is assigned to the each group.
REFERENCES:
patent: 5712800 (1998-01-01), Aucsmith
patent: 5850444 (1998-12-01), Rune
patent: 2003/0120931 (2003-06-01), Hopkins et al.
patent: 2005/0097317 (2005-05-01), Trostle et al.
Chmora Andrey L.
Urivskiy Alexei V.
Orgad Edan
Samsung Electronics Co,. Ltd.
Sughrue & Mion, PLLC
Tolentino Roderick
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