Steganography is the practice of embedding hidden messages within a carrier medium. Mathematicians, military personnel, and scientists have used it for centuries. The use of steganography dates back to ancient Egypt. Today steganography, in its digital form, is widely used on the Internet and in a variety of multimedia forms. Modern steganography works by replacing bits of useless or unused data in regular computer files with bits of different, invisible information. When a file cannot be encrypted, the next best option for safe transfer is steganography. Steganography can also be used to supplement encryption. When used in this manner, steganography provides a double measure of protection, as the encrypted file, once deciphered, will not allow a message hidden by steganography to be seen. The receiver of the file has to use special software to decipher a message hidden by steganography. [download]
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