Secure voice cryptography based on Diffie-Hellman algorithm

This article introduces a new technique for voice signals encryption & decryption to ameliorate the information security during transferring over unsecure network. The presented mechanism is based on a particular type of asymmetric key cryptography called Diffie-Hellman Algorithm. The main reason of using this algorithm is enabling users to encrypt and decrypt their messages via a shared session key that is known only for them. Firstly, the input voice signal in this scheme is enciphered by utilizing the shared secret key at the dispatcher. Secondly, the scrambled voice signal is delivered to the destination through open telecommunication network. Eventually, the cipher text signal is deciphered at the receptor by exploiting the same key to retrieve the plaintext signal. The performance of the presented voice cryptosystem is assessed via different known ciphering/deciphering voice measures for different voice signals. The computed and visual results in addition to comparison outcomes confirm that the presented cryptosystem can fulfill good enciphering and deciphering results and it is capable of tolerating various cryptographic analyses.