Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Particular communication authentication technique
Reexamination Certificate
2006-10-24
2006-10-24
Louis-Jacques, Jacques (Department: 2134)
Electrical computers and digital processing systems: support
Multiple computer communication using cryptography
Particular communication authentication technique
C726S026000, C726S032000, C726S033000
Reexamination Certificate
active
07127615
ABSTRACT:
This invention relates to security for data objects; more particularly, the present invention relates to improved security based on subliminal and supraliminal channels for data objects.In one embodiment, a method for protecting a data signal comprises: providing a data signal to be encoded; using a first predetermined key to encode a first set of independent data into the data signal imperceptibly; and using a second predetermined key to encode a second set of independent data into the data signal perceptibly.In another embodiment, a method of protecting a data object comprises: steganographically encoding a subset of candidate bits in a digitized sample stream; perceptibly manipulating data in the digitized sample stream; and combining the imperceptible and perceptible data changes to create a secure/unique digital sample stream.In yet another embodiment, a method for securing a data signal comprises: preanalyzing said data signal for candidate watermark/signature bits; steganographically encoding independent data into the data signal into a subset of the candidate watermark bits, at least one time; and encoding the data signal subsequently with a perceptible technique.In yet another embodiment, a method of protecting a data signal comprises: imperceptibly embedding data using a watermarking technique; perceptibly signing the data using the receiver's public key; encrypting the data signal using the receiver's public key and the private key used to watermark the signal; and enabling a receiver to authenticate/verify (separate steps) the data signal while connected to a communications channel.
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Blue Spike, Inc.
Lipman Jacob
Louis-Jacques Jacques
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