Abstract

Recently emerged interest in the transfer of information, whether speech or image or text information . To maintain the confidentiality of such information we need to encrypt it. In this paper, we used wavelet packet transform to transfer speech signal from time domain to frequency domain after that a new encryption algorithm is proposed by analyzing the principle of the chaotic encryption algorithm based on logistic map and blowfish encryption algorithm . Chaotic function is used to make the algorithm more secure and make the process of the encryption and decryption more complex. We used partial encryption technique for faster the encryption /decryption speed process. Moreover, the performance of the proposed algorithm is also estimated by used SNR,PSNR,NRMSE,RSE quantities. Experimental result of the algorithm shows that the algorithm is faster, stronger and more secure. Use the Matlab ver.8.a in the different treatments stage.

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The article was added to IASJ on 2013-05-26

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