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The rapid development of multimedia and internet allows for wide distribution of digital media data. It becomes much easier to edit, modify and duplicate digital information. In additional, digital document is also easy to copy and distribute, therefore it may face many threats. It became necessary to find an appropriate protection due to the significance, accuracy and sensitivity of the information. Nowadays, protection system can be classified into more specific as hiding information and encryption information or a combination between them. The strength of the combination between hiding and encryption science is due to the non-existence of standard algorithms to be used in (Hiding and encryption) secret messages.
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