Robust and Secure Speech Based on Elliptic Curve Cryptography for WB G.722.2

Elliptic Curve Cryptographic (ECC) systems are now increasingly used in protocols using public key cryptography, as it allows to significantly reduce the size of the keys used compared to other cryptographic systems such as RSA (Ron Rivest, Adi Shamir and Leonard Adelman). ECC is based on Elliptic Curve (EC) theory, for creating faster, smaller, and more efficient cryptographic schemes. This paper presents an encryption scheme for AMR-WB ITU-T G.722.2 speech based on ECC for securing transmitted speech signals. The implementation of ECC is carried out by transforming the coded speech into an affine point on the elliptic curve, over a finite field. The proposed cryptosystem is evaluated by including waveform and spectrogram analysis, Enhanced Modified Bark Spectral Distortion (EMBSD) and Wideband Perceptual Evaluation of Speech Quality (WB-PESQ) for objective testing and Mean Opinion Score (MOS) for its subjective counterpart in order to confirm the efficiency of our proposed method in terms of security and privacy.