Cryptography – Electric signal masking
Reexamination Certificate
2006-02-21
2010-06-15
Vu, Kimyen (Department: 2435)
Cryptography
Electric signal masking
C380S203000
Reexamination Certificate
active
07738659
ABSTRACT:
Multiple transform utilization and applications for secure digital watermarking. In one embodiment of the present invention, digital blocks in digital information to be protected are transformed into the frequency domain using a fast Fourier transform. A plurality of frequencies and associated amplitudes are identified for each of the transformed digital blocks and a subset of the identified amplitudes is selected for each of the digital blocks using a primary mask from a key. Message information is selected from a message using a transformation table generated with a convolution mask. The chosen message information is encoded into each of the transformed digital blocks by altering the selected amplitudes based on the selected message information.
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King John B
Vu Kimyen
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