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A comment on Be careful what you copy: Invisibly inserting usernames into text. Parent comment

Re:Be careful what you copy: Invisibly inserting usernames i... by amelius on Wednesday April 04, 2018 @07:32AM (#16753753)
See e.g. Spread Spectrum Image Steganography for embedding messages under the noise level.

http://www.lia.deis.unibo.it/Courses/RetiDiCalcolatori/Proge...

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