Cryptography – Electric signal masking
Reexamination Certificate
2006-05-16
2006-05-16
Song, Hosuk (Department: 2135)
Cryptography
Electric signal masking
C713S176000, C726S026000
Reexamination Certificate
active
07046808
ABSTRACT:
A system for determining the amount of processing that has been applied to watermarked signal. A steganographic signal is provided that includes an original signal and an embedded fragile watermark. The fragile watermark is characterized by a low energy and a high redundancy in comparison to a robust watermark. The steganographic signal is communicated over a distribution channel to a decoder. At the decoder, a measure of a presence of the fragile watermark in the acquired steganographic signal is provided, along with an estimate of the fragility profile of the fragile watermark for this particular original signal. Based on these factors, a estimate is made of the amount of processing that the steganographic signal has undergone. This processing can include, for example, A/D and D/A conversions, resampling, band-limiting, perceptual compression/decompression, etc. Optionally, the fragility profile is derived prior to the distribution of the content and communicated by the steganographic signal for recovery by the decoder. Furthermore, a robust watermark may be provided in the steganographic signal that, e.g., designates the presence of the fragile watermark to a decoder.
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Jemili Kanaan
Metois Eric
Petrovic Rade
Lipsitz & McAllister LLC
Song Hosuk
Verance Corporation
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