stegnography

Steganography is the process of hiding information within another file so that it is not visible to the naked eye. It's the art of hiding information in plain sight, and it's a particularly valuable communication secrecy tool for those who do not want others to know that they are even communicating in the first place. One of the most common steganography techniques involves hiding text within an image file. Image files are quite large and contain millions of individual pixels, each of which is shaded an individual color.