Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Particular node for directing data and applying cryptography
Reexamination Certificate
2005-11-08
2005-11-08
Zand, Kambiz (Department: 2132)
Electrical computers and digital processing systems: support
Multiple computer communication using cryptography
Particular node for directing data and applying cryptography
C713S167000, C713S193000, C713S152000, C380S201000, C380S217000, C705S057000
Reexamination Certificate
active
06963972
ABSTRACT:
A method and system enables network intermediaries such as proxies to transcode multimedia data without violating end-to-end security guarantees. In one embodiment, a content provider decomposes a data stream into a plurality of components, each of which are independently encrypted. In a preferred embodiment, an intermediary or proxy performs transcoding of the components by prioritizing and dropping predetermined components, in accordance with unencrypted clear-text metadata associated with each component, without the need for decrypting the components. Clear-text metadata preferably provides a semantic understanding of the absolute or relative importance/priority of the components with respect to each other, thereby facilitating the transcoding process. The destination/client device can subsequently decrypt the components transmitted by the transcoding proxy and reassemble them into a representation of the original data content.
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Chang Yuan-Chi
Han Richard Yeh-whei
Li Chung-Sheng
Smith John R.
Dougherty Anne V.
International Business Machines - Corporation
Zand Kambiz
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