Cryptography – Communication system using cryptography – Time segment interchange
Reexamination Certificate
2004-12-22
2010-06-08
Abrishamkar, Kaveh (Department: 2431)
Cryptography
Communication system using cryptography
Time segment interchange
C380S028000, C380S044000, C380S201000
Reexamination Certificate
active
07734042
ABSTRACT:
An initialization vector (IV) is employed to decrypt a block of a stream that has been encrypted with Cypher Block Chaining (CBC) encryption, without requiring decryption of previous blocks within the stream. For example, a listener who accesses a distribution point to retrieve encrypted content authenticates himself to an application server that regulates access to encrypted content on the distribution point, and responsively receives a key. The listener then requests access to a reference point within the encrypted content stream somewhere after its beginning (e.g., using preview clips). The distribution point relates the reference point to a corresponding block of the encrypted stream, and identifies an IV previously used for encryption of that block. The distribution point provides the associated encrypted block of content and the IV to the listener to enable mid-stream rendering of the encrypted content, without requiring the listener to decrypt previous blocks within the encrypted stream.
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Biderman David L.
Bill David S.
Brown Scott K.
Cahill Conor P.
Loomis Stephen E.
Abrishamkar Kaveh
AOL Inc.
Fish & Richardson P.C.
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