Hiding Encrypted Data in Audio Wave File

Abstract

at a time of globalization in which the whole planet become look like a small village and transport information through it with a push button in keyboard and at a time of huge evaluation in the digital world and for the millions of users to international net and some application importance, let us to use both cryptography and steganography as a means to protect the information from hacking and interlopers. Combinations of steganography and cryptography have been made in this paper to increase the level of security and to make the system more complex to be defeated by attackers. This paper presents a method of ciphering and hiding information into a cover of audio wave file. In the first step, the text is converted to its equivalent ASCII code. Text is scrambled using DES (Data Encryption Standard) technique according to secret key then the cipher text is embedded inside a cover audio wave file using time and frequency domain. The modeled system builds of a secret key steganographic system, which embeds certain text after scrambling into random positions inside audio wave file and the other technique used in this paper to analyze the cover audio into its frequency components is wavelet transform using Haar filter as a basis function. Tests were carried out to evaluate the performance of the modeled algorithm and results in successful hiding. From the simulation results on the time domain, it is noticed that value of Signal to Noise Ratio (SNR) will decrease as the number of bits in the audio wave file to be replaced by the message increase and noticed that the value of SNR in frequency domain is higher than in time domain, so hiding in frequency domain is better than hiding in time domain.