SECURE DATA TRANSMISSION USING VIRTUAL PRIVATE NETWORKS
B. Ramasubba Reddy, A Saritha, B.Balakonda Reddy · 2017
A Virtual Private Network (VPN) is a general network mechanism to offer a secure end-to-end network connection.The design is to first negotiate and setup a network tunnel among the two communication nodes.Generally a VPN server also connects to a RADIUS server to permit only authorized users have the privilege to establish such tunnels.The data will then be encrypted before it is transmitted over the network and will then be decrypted on the receiver side.Compared to dedicated private leased lines, VPNs are much cheaper and are ideal to many companies.VPN is the network which offers security to the sensitive traffic while traversing networks like Internet.A VPN is a communications environment in which access is controlled to permit peer connections only within a defined community of interest, and is constructed through some form of partitioning of a common underlying communications medium, where this underlying communication medium provides services to the network on a non-exclusive basis.The main objective of VPN is to prevent outsiders (hackers) from interfering with messages sent among hosts in the network, and to protect the privacy and integrity of messages going through untrusted networks.From the user's perspective, a VPN connection is a point-to-point connection between the user's computer and the company's server.The nature of the intermediate inter network is irrelevant to the user because it appears as if the data is being sent over a dedicated private link.VPN has been adopted by many organizations looking to expand their networking capabilities while reducing their costs.The key feature of a VPN is its ability to use public networks like the Internet rather than private leased lines in order to allow remote users to access the corporate network.