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It is known that the computer files containing unnecessary space, and therefore it can use these spaces to hide digital information where, knowing that it will be this unnecessary areas ignored by stating that he would not hang the file, with not notice any difference because the added data will not change anything image .
here , the choice of the center carrier of the message in the success of the move Bkhvah to the other party, case file , which contains a lot of unused data is ideal for transportation, and are usually determine the center 's ability to move the hidden information through the rate of information that can be hidden to the phenomenon of information .
another feature no less importance is the degree and disappearances. If the information concealed in the center difficult discovery, the center was better. It is also the most important qualities of a good center is not to change the message during transport. And examples of media that can be used: images, audio files and video, data transmitted across networks depending on the type of protocol used , for example , (TCP / IP, UDP, ICMP ).
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