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Invisible ink, in a digital context, is a tool or method used to convey a message through steganography, the science and art of concealing information. The main idea is to replace some information with a concealed message through a cover object. With the introduction of the digital and electronic era, video and audio media provide a good cover for hiding messages.
Digital invisible ink is based on the same concept as the generic meaning of the term. The classic experiment is to hide a message via lemon juice on a blank sheet of paper. Now, digital methods can be used to accomplish the same thing.
There are many data-hiding programs and applications available that implement the use of steganography digitally with functions to do things such as: