An Improved DCT Based Steganography Technique

An Improved DCT Based Steganography Technique

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Steganography is the art and science of hiding the existence of the communication, i.e., it hides secret messages inside other file formats. The word was derived from the greek word steganos which means "covered" and graphia means "writing" i.e. covered writing. To human eyes, data usually contain known forms like images, email, sound and text. Most internet data naturally include unwarranted headers too. These are media exploited using steganography techniques. Many methods for hiding data in digital images have been proposed, so far: Some embed secret data in the spatial domain, and others h...