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    Secure voice by using AES algorithm
    (Aksaray Üniversitesi Fen Bilimleri Enstitüsü, 2017) Hussein, Sabah Salih; Tolun, Mehmet R.
    This thesis study encryption \decryption text and voice by using AES algorithm, then comparing between them to know which one is better by using three standards. Speed, time duration and security. In this thesis we used five operation modes first ECB - Electronic Code Book. However the second one CBC - Cipher Block Chaining. The third one OFB - Output Feedback. The forth operation mode CFB - Cipher Feedback. The last operation mode is, CTR - Counter Mode. We cannot say which mode operation is the best. Because each of them have advantages and disadvantages but for encryption \decryption text counter mode is better than other mode operation. Because it is faster and simple for using more than other mode operations. After encrypted and decrypted audio by using the AES algorithm. Obtained different results however needed more time than text for encryption and decryption .in order to audio have more data than text Therefore, need more time than text for encryption and decryption (AbdelrahmanAltigani, Bazara Barry, 2013). According to speed for encrypt and decrypt text is faster than audio in order to for encryption and decryption audio have many data (AbdelrahmanAltigani, Bazara Barry, 2013).But text has less data if compared to voice. Then less data need less time. According to security audio is more secure than text and also more difficult to hack by hackers. Utilized Matlab code in this thesis in order to it has the capacity to plot graphical inclusive. use MATLAB is more appropriate than other packages like java and C#,in order to it has a large a collection of tools and libraries; moreover, for programming, it have not necessary for beginning from zero in order to MATLAB previously has functions for performing limited missions whilst some programs like C# should needs for beginning from zero.