Steganography comes from the Greek words meaning to cover tightly and writing. In today terminology it refers to the act of hiding codes or messages into different mediums. On the other hand digital image steganography refers to concealing a message in a digital format most likely using a picture. I first found out about digital steganography while watching one my shows Law and Order SVU. One of the suspects was apprehended and had child pornography encrypted into random images. Its a very interesting way of passing along messages that are very important and shouldn't be seen by many but it an also be used for several illegal acts such as child pornography.
Digital steganography makes use of the fact that in a number of file formats, data is reduplicated or some data is of little importance, and the hidden message does not cause noticeable changes to the file. It is used in graphics files, HTML, sound files, video, and text files. Digital steganography is related to hidden digital watermarking. There is special software to enable the practice of digital steganography, and it may enable hiding a message within a digital watermark, although other methods may be more common. Some digital steganography software is better than others at effectively concealing messages.
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