Steganography is a technique for hiding a message inside another message or physical object.
The most common method of hiding data in computers and electronic devices is to hide the data in a computer file, message, image, or video inside another file, message, image, or video.
The word steganography comes from the Greek word steganographia, a combination of steganós, meaning “covered, hidden”, and -graphia, meaning “to write”
The advantage of steganography over cryptography alone is that the intended secret message is not focused on the message itself as an object of scrutiny.
When an encrypted message is visible, it is intriguing, no matter how unbreakable, and in countries where encryption is illegal, it can be a crime in itself
Whereas cryptography protects only the content of the message, steganography aims to hide the fact that you are sending a secret message and its content.
Steganography includes hiding information in computer files.
Digital steganography allows for steganographic coding inside the transport layer of document files, image files, programs, and protocols in electronic communications.
Media files are suitable for steganographic transmission because of their large size. For example, a sender might start with a plain image file and adjust the color of the 100th pixel to correspond to a letter of the alphabet. This subtle change is so minute that the change is rarely noticed.
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