Cryptography – Key management – Key distribution
Reexamination Certificate
2011-04-12
2011-04-12
Arani, Taghi T. (Department: 2438)
Cryptography
Key management
Key distribution
C380S277000, C380S279000, C380S044000, C380S045000, C713S162000, C713S163000, C713S189000, C713S193000, C726S026000, C726S027000, C726S028000, C726S029000, C726S030000
Reexamination Certificate
active
07925025
ABSTRACT:
A tree is used to partition stateless receivers in a broadcast content encryption system into subsets. Two different methods of partitioning are disclosed. When a set of revoked receivers is identified, the revoked receivers define a relatively small cover of the non-revoked receivers by disjoint subsets. Subset keys associated with the subsets are then used to encrypt a session key that in turn is used to encrypt the broadcast content. Only non-revoked receivers can decrypt the session key and, hence, the content.
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Lotspiech Jeffrey Bruce
Naor Dalit
Naor Simeon
Arani Taghi T.
Herzog Madhuri
International Business Machines - Corporation
Rogitz John L.
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