Cryptography – Communication system using cryptography – Data stream/substitution enciphering
Reexamination Certificate
2007-07-23
2009-11-24
Zand, Kambiz (Department: 2434)
Cryptography
Communication system using cryptography
Data stream/substitution enciphering
C380S260000, C380S280000, C380S217000
Reexamination Certificate
active
07623657
ABSTRACT:
Techniques for securely and adaptively delivering multimedia content. It is assumed that a set of alternate access units for each time slot is obtained. Then, the encryption stream index of each access unit from the set of alternate access units of the previous time slot are obtained. An encryption stream index is then assigned to each access unit in the set of alternate access units in the current time slot, such that the encryption index increases over time. Thus, the invention overcomes the problem of encrypting a multimedia stream that may have multiple access units for each time slot by selecting the encryption index for each access unit such that the encryption index increases, regardless of which access unit the delivery system (e.g., server) selects for transmission.
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Amini Lisa D.
Frossard Pascal
Venkatramani Chitra
Verscheure Olivier
Westerink Peter
Dougherty Anne V.
International Business Machines - Corporation
Ryan & Mason & Lewis, LLP
Zand Kambiz
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