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INTRODUCTION

Steganography is derived from the Greek and literally means clustering, "Covered writing". This is one of the time hiding various techniques aimed at Passing a message over a channel, where some other kind of information already given. This distinguishes steganography of underhanded methods channel that instead of passing in between two objects that were previously not connected.
The goal of steganography is hiding messages inside other innocuous messages in a way that does not allow any enemy of ADI, to discover that there is a second secret of the present communication. The only missing information is reduced from the enemy easily Exchangeable sequence of random numbers, the secret key, secret key without the enemy should not have the slightest chance of further Becoming suspicious on noticed that channel of communication, there may be a hidden message.
Steganography is closely related to covert channels in a safe operating system design, this term refers to all communication channels Which are not limited access control can easily be mechanisms. In an ideal world we would have the whole year to be able to send encrypted mail or files open with each other without fear of reprisal. However, there are Often cases where possible, or to work because the company does not allow encrypted e-mail or local Government does not approve the encryption connection (in fact in some parts of the world). This is where steganography come into play.

Data hiding Techniques can also be classified according to the extraction process:

Cover methods of Escrow as an original part of the encoded information and one to retrieve the embedded data.
Blind or not noticing the schema can restore the hidden message by using clustering only the encoded data.

Steganography has developed a lot in recent years, as digital methods enable new ways of hiding information within another, and this can be valuable in many situations. The first hire a hidden radio-with series combining electronic methods were the army, due to the strategic importance of secure communication, and the need to hide the source as much as possible.
Currently, new restrictions on the use of strong encryption for messages added to international laws, so that if two peers are willing to use it, they resort to hiding the CAN communication in looking casual date. This problem is becoming more and more important these days, after Wassenaar, with international treaty about thirty-One of the main-towards technology-countries in the world have decided to Apply cryptography export restrictions, these United States "¢ S ones.
Another use of steganography is to protect sensitive data. The file system CAN BE hidden in random, seeking files on the hard drive, requiring a key to retrieve the source files. This can protect against physical attacks on people to get their passwords, because maybe the attacker kana "¢ t even know that some files have the disk.
Serious concern of steganography is stealth, because if an attacker year, either passive or active, you can detect the presence of a message, to this point, he can try to retrieve it and, if it is encrypted, to decipher it. Opposition attempting to destroy or noise is not required, as we believe the sender and recipient are equally interested in the message exchange, so they will try to pass the STEGO-environment in the best case, they can. If the STEGO time can be transmitted on the selected channel, and this is usually the case with all media that used, for example, images or sounds, THEN the built-in data will be saved along with them. Amaranth, concealment Methods of steganography must focus on maximum strength against detection and extraction.