audio signal encryption based on permutation relations and residue number system

this paper presents a new audio encryption algorithm based on permutation and residue number system. in the current approach, signal samples are combined with residue number system through permutation; therefore, a specific noise is generated. then, the audio signal is combined with the noise, generated by the algorithm, to produce a silence signal. for this purpose, the algorithm uses a predefined permutation format and a modular set in the form of {2n-1, 2n, 2n+1} to encrypt the main signal. consequently, the proposed algorithm converts the input signal into a silence signal and increases its security. the signal-to-noise ratio (snr) was used to evaluate the algorithm. the results indicated very low values of snr pertaining to audio signals in the proposed method.