Introduction to Watermarking

Watermarking

Watermarking has the additional requirement over steganography of being robust in case of malicious or non-malicious attacks on the data being sent to the receiver. This is the equivalent of an active warden in the Prisoners Problem discused earlier

The watermarking process can be described[4] figuratively as follows:

Types of watermarking

Private (nonblind Watermarking)

These systems require at least the original data . Type I systems extract the watermark from the distorted data and use the original data as a hint to find where the watermark is. Type II systems require a copy of the original embedded watermark.

Semi-private watermarking (semiblind watermarking)

It does not use the original data but answers the same question posed above

Public watermarking (blind watermarking)

Watermarking is the commercial face of Steganography. Without realizing it we daily interact with a variety of watermarks fron currency to internet images. The idea of digital rights management, copyright violations and piracy complains on the internet have made watermarking an important mainstream issue.

Watermarking

Types of watermarking

Private (nonblind Watermarking)

Semi-private watermarking (semiblind watermarking)

Public watermarking (blind watermarking)