الفهرس 
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Abstract
The rapid growth of the internet and it’s applications which hold our data requires creativity in developing a secure system. The security of information is a vital issue which researches do their best to develop and improve methods that secure data from unauthorized users. These methods fall into two basic categories data encryption and data hiding. Data encryption is the way of transforming the data from its original form into another unreadable form. The trusted users allowed holding a secret key that decrypts the encrypted data to its original data. Data encryption has been widely used, but it has some strength and weakness points. The main weak point is the appearance of the encrypted data which attracts an unauthorized user to crack it.