Cryptography – Communication system using cryptography – Symmetric key cryptography
Reexamination Certificate
2006-07-25
2010-10-26
Barron, Jr., Gilberto (Department: 2432)
Cryptography
Communication system using cryptography
Symmetric key cryptography
C380S278000, C380S042000
Reexamination Certificate
active
07822203
ABSTRACT:
An information processing apparatus decrypts, using meta data, encrypted data obtained by encrypting stream data including successive frames according to an encryption method in which, when the stream data is sequentially encrypted on a frame-by-frame basis, a key used for encrypting each frame is updated according to a predetermined rule. The meta data includes the plurality of keys used for encrypting the stream data and update information for identifying update timings of the keys. The apparatus includes a decrypter for acquiring the encrypted data and decrypting each frame using the key used for encrypting the frame and a meta data acquirer for acquiring the meta data and delivering one of the keys corresponding to the frame to the decrypter in accordance with the update information. The meta data acquirer includes a corrector for detecting an error in the update information and correcting the update information if an error has occurred.
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U.S. Appl. No. 11/495,568, filed Jul. 31, 2006, Soda.
Barron Jr. Gilberto
Gregory Shaun
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
Sony Corporation
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