Cryptography – Video cryptography – Video electric signal modification
Reexamination Certificate
2006-12-19
2006-12-19
Louis-Jacques, Jacques (Department: 2134)
Cryptography
Video cryptography
Video electric signal modification
C380S260000, C725S031000
Reexamination Certificate
active
07151832
ABSTRACT:
Dynamic varying of encrypting of a stream of data at an encryption unit based on data content is disclosed. The dynamic varying of the encrypting, which can be responsive to passage of a predefined number of units of physical data or passage of a predefined number of conceptual units of data, is accomplished by changing at least one encryption parameter over different portions of the data. The at least one encryption parameter can comprise one or more of an encryption key, an encryption granularity, an encryption density scale, an encryption density, an encryption delay, an encryption key update variable, and an encryption key update data trigger. The change in encryption parameter is signaled to a receiver's decryption unit and used by the decryption unit in decrypting the dynamically varied encrypted stream of data. The stream of data may comprise, e.g., MPEG compressed video or audio.
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Fetkovich John Edward
Lam Wai Man
Wilhelm, Jr. George William
Heneghan Matthew
Heslin Rothenberg Farley & & Mesiti P.C.
International Business Machines - Corporation
Louis-Jacques Jacques
Radigan, Esq. Kevin P.
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