المجلة الدولية للعلوم والتقنية

With the increasing growth of the Internet, the rapid progress of cloud computing, and the development of business and e-commerce applications, the exchange of information and services between public, private, industrial, governmental and academic institutions is witnessing an unprecedented development, addition, the development of wireless networks in recent years. On the other hand, many complex security issues have emerged and increasing of cybercrime, various attacks, unauthorized access, and information theft and service deterioration have increased, Because of the advanced technical skills of the attackers. Therefore, it was necessary to have a reliable intermediary that ensures maximum security of confidential and sensitive data being put away or transmitted over public networks. In this paper, Virtual Private Network (VPN) technology was presented, which is an effective and reliable way to secure data, devices and resources from hacking and electronic attacks, because they are virtual connected networks, and it is a widely accepted technology for organizations to enhance their business operating over the Internet , In other words, a diverse security model that contains authentication, confidentiality, data integrity and provides a secure transmission of data over the Internet. This paper also discussed the advantages, types and security characteristics of this technology, In addition, the threats and security measures and the most one discuss was security protocols used. Keywords – authentication ,encryption, Hash Algorithm ,packets (IP), protocols, nodes.