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Steganography has been widely used for centuries. Some examples include: Hidden messages on a paper written in secret inks. Hidden messages distributed, ing to a certain rule or key, as smaller parts (e.g. words or letters) among other words of a less suspicious cover text.

The major characteristics of steganography is the fact that data is hidden in the redundant bits of an object and because redundant bits are left out when utilizing JPEG it was feared that the hidden message can be lost. In JPEG, it can be used to create the changes to the image invisible to the human eye.

Depending on the nature of the cover object(actual object in which secret data is embedded), steganography can be divided into five types: Text Steganography. Image Steganography. Video Steganography. Audio Steganography. Network Steganography.

Technical steganography uses scientific methods to hide a message, such as the use of invisible ink or microdots and other size reduction methods.

Steganography Examples Include Backward masking a message in an audio file (remember those stories of evil messages recorded backward on rock and roll records?) Concealing information in either metadata or within a file header. Hiding an image in a video, viewable only if the video is played at a particular frame rate.

A steganography technique involves hiding sensitive information within an ordinary, non-secret file or message, so that it will not be detected. The sensitive information will then be extracted from the ordinary file or message at its destination, thus avoiding detection.

Depending on the nature of the cover object(actual object in which secret data is embedded), steganography can be divided into five types: Text Steganography. Image Steganography. Video Steganography. Audio Steganography. Network Steganography.