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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.

Steganography ?Covered Writing? Some of these do it by simply appending the ?hidden? file at the tail end of a JPEG file and then add a pointer to the beginning of the file. The most common way that steganography is discovered on a machine is through the detection of the steganography software on the machine.

How is steganography used today? In modern digital steganography, data is first encrypted or obfuscated in some other way and then inserted, using a special algorithm, into data that is part of a particular file format such as a JPEG image, audio or video file.

Steganography is a means of concealing secret information within (or even on top of) an otherwise mundane, non-secret document or other media to avoid detection. It comes from the Greek words steganos, which means ?covered? or ?hidden,? and graph, which means ?to write.? Hence, ?hidden writing.?

In image steganography, pixel intensities are used to conceal the data. In digital steganography, images are broadly utilized cover source because there are multiple bits presents in computer description of an image. Cover-Image ? Original image which can be used as a carrier for hidden information.

Steganography has been widely used for centuries. Some examples include: Hidden messages on a paper written in invisible ink. 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.

Below are a few concealing techniques used in Steganography: LSB. We have already discussed this technique above. ... Palette-based technique. ... Secure cover selection. ... Masking and filtering. ... Redundant pattern encoding (RPE) ... LSB insertion. ... Encrypt and scatter. ... Algorithms and transformations.