Speech encryption using advanced encryption standard for secured communication

Abstract

Securing speech communication is a great challenging task and interesting research area in recent years. Transmission of voice data over untrusted networks leads to attack the confidential information. Various speech encryption algorithms are in progress and even though speech data have been encrypted some additional features are still getting compromised to the eavesdroppers which are a get setback for security attacks. The state-of-art of Advanced Encryption Standard (AES) algorithm when compared to other encryption algorithm it has different types of cipher key length such as 128,192 and 256 bits respectively. Advanced Encryption Standard is analyzed statistically for revealing its superiority based on confusion and diffusion properties for evaluating the robustness against statistical attacks. A novel approach is developed for encrypting speech data using Advanced Encryption Standard (AES). Encrypted and the decrypted signal are evaluated based on some quality analysis for immunity checking against frequency-domain attack, brute force attack and statistical attack etc.