Watermarking
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Watermarking, or data hiding, consists of embedding a typically invisible identifier into an image, video or audio file for security reasons.
Watermarking requires both embedding and extraction algorithms. Mathematical techniques can include least-significant bit encoding, transform or image-adaptive techniques and basic M-sequence.
In recent years linear algebra has provided new methods for watermarking. Specifically, the technique of Singular Value Decomposition enables more powerful and sophisticated watermarking that is resistant to attack.