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Hiding messages in the Noise of a Picture

Platform : C# .Net

Data hiding is a characteristic of object-oriented programming. Because an object can only be associated with data in predefined classes or templates, the object can only "know" about the data it needs to know about. There is no possibility that someone maintaining the code may inadvertently point to or otherwise access the wrong data unintentionally. Thus, all data not required by an object can be said to be "hidden". Data hiding in media, in images, video and audio, is of interest for the protection of copyrighted digital media, and to the government for information systems security and for covert (steganographic) communications. It can also be used in forensic applications for inserting hidden data into Image files for the authentication of spoken words and other sounds, and in the music business for the monitoring of the songs over broadcast radio. The technology enables the insertion and recovery of hidden data in Image files through manipulation of the relative phase of harmonically related components.       Steganography is the art and science of writing hidden messages in such a way that no one apart from the intended recipient knows of the existence of the message. The word "Steganography" is of Greek origin and means "covered, or hidden writing".An encrypted file may still hide information using Steganography, so even if the encrypted file is deciphered, the hidden message is not seen. Steganography used in electronic communication include steganographic coding inside of a transport layer, such as an Image file. The advantage of steganography over cryptography alone is that messages do not attract attention to themselves, to messengers, or to recipients. A steganographic message (the plaintext) is often first encrypted by some traditional means, and then a hidden text is modified in some way to contain the encrypted message (cipher text), resulting in stegotext

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