The change in the file size might be used as a feature in steganalysis. ... OutGuess 0.1, OutGuess 0.2, and complementary embedding methods increase the file size, while F5, nsF5, and PQ decrease it. The secure steganography methods J-UNIWARD and SI-UNIWARD almost do not change the file size.

Is steganography still used today?

In the centuries that followed, more modern forms of steganography were invented, such as invisible inks. Today, steganography has moved to the digital world. “Steganography by definition is the hiding of one file within another,” says Ira Winkler, lead security principal at Trustwave.

Why is steganography used?

Steganography is the art of hiding a message. The purpose of steganography is to hide a message from a someone you don't want to see it. ... Steganography works by changing bits of useless or bot used data in regular computer files (such as graphics, sound, text, HTML) with bits of different, invisible information.