Implementation of salsa20 stream cipher algorithm as an alternative cipher suite SSL-VPN for VOIP security

Abstract

Voice over Internet Protocol (VoIP) is one of the emerging communication technologies. The use of VoIP has the threat of tapping. Therefore, it is necessary to implement security services for VoIP, one of them using SSL-VPN. SSL-VPN uses cipher suites that contain a collection of cryptographic algorithms to provide various cryptographic services, starting from authentication, key exchange, encryption and message digest. In this study, modification of cipher suites was carried out in SSL-VPN, by implementing the Salsa20 stream cipher algorithm as an alternative to TLS cipher suites. Furthermore, the results of the alternative implementation of TLS cipher suites are used and tested to secure VoIP communication. Tests carried out are vectors test, data transfer speed performance test, and measurement of QoS dan MOS of VoIP communication secured with the alternative Salsa20 TLS cipher suite.