Design and implementation of a VIPSec based application

Abstract

Voice over IP (VoIP) is one of the most emerging technologies, while a respectable number of corresponding applications are being implemented or updated in daily basis. Although communications security is a constant challenge, most VoIP applications take little or no security provisions. In the present work we describe the design and implementation of a secure VoIP application that is using the security mechanisms of Voice Interactive Personalized Security protocol (VIPSec). We analyze the architectural elements and we present the implementation characteristics of the application regarding the end-to-end security. Our approach follows the client-server model for subsidiary procedures like user sign-in and the direct client connection model for key, data and voice exchange between the users. The application is developed in the Delphi/Kylix language and is compatible with all versions of MS-Windows or Linux running on an x86 compatible computer, essentially providing secure PC-to-PC voice and data communications.