Securing Modern IP-based Voice Communication

Abstract

Nowadays multimedia applications such as voice and video are crucial in internet communication and multimedia systems. Thus, securing such systems is very important to overcome intrusion and eavesdropper attacks. Modern voice communication systems demand a huge amount of information to be exchanged across local networks and internet every day, therefore, there is real need for encryption by improving cryptography techniques along with the development of network communication technologies. The conventional cryptographic techniques may be efficient for the text data however, they are unsuitable to the data with large capacity. Therefore, speech security requires efficient techniques like chaos-based techniques to deal with bulky data. Chaos-based techniques provide fast and highly secure encryption methods as they have features of chaotic maps that include good properties such as determinism, irregularity, nonlinearity, and sensitivity to initial conditions and control parameters. Due to these features, chaotic maps are convenient to be applied in voice encryption. We propose two approaches for securing digital voice communication. The first approach uses multilevel chaos-based block cipher, and the second approach uses non-autonomous chaotic modulation techniques.