Digital image steganography works by adding secret bits to an image file. This technique is not frequently used so many people do not know how to decode it. This makes the technique a favorite among hackers because it is hard to decode. This makes it a good method of transmitting business or personal information on many different outlets such as e-mail or social media. There are two different approaches to digital image steganography. One is by adding extra bit files and the other approach is using the the least significant bit (LSB).
Adding bit files is one approach that is as simple as adding extra bits to a file. Hidden messages can appear in the file header, which contains information on the file. Every file has a predefined "end of file here" mark. The secret message could be attached after the end of the file. files will not be modified, but an grow in size. Outsiders with access to the original file could easily see that there is a hidden message hidden inside of the file. Using the least significant bit is the other approach. This approach is simply the replacing of unimportant bits of the file that will not alter the image.
Source: http://www.itworld.com/article/2826840/security/crash-course--digital-steganography.html
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