Scientists develop FontCode, that hides information by imperceptibly changing the shapes of fonts in text.

Wikipedia defines Steganography is the practice of concealing a file, message, image, or video within another file, message, image, or video. The word steganography combines the Greek words steganos (στεγανός), meaning “covered, concealed, or protected,” and graphein (γράφειν) meaning “writing”. For example, the hidden message may be in invisible ink between the visible lines of a private letter.