Cryptography – Video cryptography – Video electric signal modification
Reexamination Certificate
2006-05-19
2011-12-20
Colin, Carl (Department: 2493)
Cryptography
Video cryptography
Video electric signal modification
C380S037000, C380S200000, C380S239000, C380S261000, C713S160000, C713S184000
Reexamination Certificate
active
08081755
ABSTRACT:
A method and system is provided for encrypting an image compressed with a JPEG2000-based compression with minimal overhead so that the encrypted codestream is compliant with the syntax of the JPEG2000-based compression and can be scaled without decrypting. The encryption system generates, for each independent encryption segment of a codestream for an image, a unique initialization vector from a global initialization vector in such a way that the initialization vectors can be generated during decryption from the global initialization vector, even after truncation. The encryption system encrypts each independent encryption segment using its unique initialization vector. The encryption system ensures that the encrypted codestream is compliant with the syntax of the JPEG2000-based compression both as originally generated and as truncated by an encryption-unaware device.
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Li Shipeng
Yang Yang
Zhu Bin
Colin Carl
Microsoft Corporation
Perkins Coie LLP
Thiaw Catherine
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