Introduction
In a conventional security thinking, IT Security at most of the enterprises follow old ‘Industrial Security Model’ where its considered that assets are held within a perimeter and users must enter the perimeter physically or logically (LAN/VPN) to access the assets and the perimeter is guarded by a gatehouse / guard. In other words, this model is called perimeterised computer network where data and applications is attached to the network and is protected by firewalls with access lis