Steganography Using Computer Images

William Barratt

Abstract:

This project investigates a method for encoding text messages in computer image files, a process called steganography. Steganography is not well-known to the public but has existed in different forms for thousands of years. The usefulness of steganography is not confined to sending secret messages; it is also possible to use hidden data to efficiently store an accompanying caption with an image. Through judicious choice of file type and algorithm, it is possible to hide data in an image with no effect detectable by methods other than pixel-by-pixel comparison with a known original. Because of the vast number of image files (including both photographs and design elements that are frequently used in Web pages) available on the Internet, steganography can go undetected if carefully created and placed.