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Steganography 2

What is Steganography ?
 It is the art and science of writing hidden messages in such a way that no one, apart from the sender and intended recipient, suspects the existence of the message. The word steganography is of greek origin and means "concealed writing" from the Greek words steganos meaning "covered or protected" and graphy meaning "writing". Anyone else viewing the message will fail to know it contains hidden/encrypted data. This can be achieved by concealing the existence of information within seemingly harmless carriers or cover.Carriers areText, Image, Audio, Video, etc
History Of Steganography: Steganography has a long history. The first recorded uses of steganography can be traced back to 440 BC when Herodotus mentions two examples in his Histories. Demaratus sent a warning about a forthcoming attack to Greece by writing it directly on the wooden backing. Histiaeus shaved the head of his most trusted slave and tattooed a message on it. After his hair had grown the message was hidden. The purpose was to instigate a revolt against the Persians
Techniques Of Steganography?
Process of Steganography can be done in the following ways:
 1) Masking and Filtering: Information is hidden inside of a image using digital watermarks that include information such as copyright, ownership, or licenses.
 2) Algorithms and Transformations: This technique hides data in mathematical functions that are often used in compression algorithms.
3) Least Significant Bit Insertion: The most common and popular method of modern day steganography is to make use of the Least Significant Bit of a picture’s pixel information. Here , the Size of Image should be large to embed any text in it..
What is Steganalysis?
 Steganalysis is the art and science of detecting messages hidden using steganography. The goal of steganalysis is to identify suspected packages, determine whether or not they have a payload encoded into them, and, if possible, recover that payload. It can be done in 2 ways:
 1) Visual Analysis : Tries to reveal the presence of secret communication through inspection, either with the naked eye or with the assistance of a computer. It does make use of any special technique or any algorithm. Hence , it is easy to use or implement.
2) Statistical (Algorithmic) Analysis : It reveals tiny alterations in an image's statistical behavior caused by steganographic embedding. Makes use of Algorithm or any Encoding method for finding the Alteration. Hence we make use of some kind of technique or software or algorithm to identify the stegnographic content.

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