Applying open networks communication authentication

Information exchanged over open networks in many cases contain sensitive data, accordingly, security became an important issue to many people. Authentication has proven to be a deterrent to intruders and ensures that information is transmitted from trusted senders to a trusted receiver. This work is an extension of previous authentication work. It presents a scrambling and encrypting mechanism to authenticate information in packet headers of the data link layer, HDLC - PPP protocol. HDLC was selected for many reasons one of which is being secured by nature.