Steganography is one of the most used encryption methods. Stegano- means “concealed”, “protected”, “covered”, and -grapy means “writing”. Steganography tries to conceal a message needed to be encrypted using unrelated text, picture, or file.
Ancient forms of steganography included wax-covered wood tablets with message on it, or message written with invisible ink between the lines of a conventional, ordinary letter.
After the development of computer technology, it has been able to hide massive amount of messages behind an image file or audio file.
This image is an example of steganography. The first image is the original one, and second one is the one containing a message.
By decoding this picture using a steganography decryption tool,
we can get the hidden message from an innocent-looking image file!
The Wonderful World of Algorithms 