Selecting the optimal conversational algorithm on the Internet based on simulation

VOIP technology provides significant benefits for customers and communication service providers such as cost savings, good media services, telephone and service portability, mobility and integration with other applications. However, there are many challenges in working with VOIP technology; Such as architectural complexity, interoperability issues, service quality issues, and security challenges. Among these issues, security risks are the most important. This study provide an algorithm to improve the security of encrypted conversations based on VOIP. In this our simulation, we use the NS2 emulator with the version 2.35NS that it is under Linux. The proposed method is AES-GCM encryption, which is compared with AES-CTR in different network parameters with two factors of time and packet size. The obtained results show that the package delivery rate in AES-GCM is higher than the operating mode of AES-CTR, which is the reason for the superiority of AES-GCM in providing service quality, furthermore in this method, encryption time, decryption, power consumption, and packet loss rate in encryption are far less than operational. In another comparison, the required time to sending the package and the delay rate in transfer of package in the proposed mode of operation is far less. Therefore, in the proposed method the low rate of time and delay are required in comparison with the AES-CTR method.