Data Encryption Algorithm for Local Area Network (LAN)

Data Encryption Algorithm for Local Area Network (LAN)

The volume of traffic moving over the Internet is expanding exponentially every day due to increase in communication through Emails, branch offices remotely connect to their corporate network and commercial transactions. Hence protection of networks and their services from unauthorized modification and destruction is very much needed. TCPIP is the most commonly used communication protocol in the Internet domain. IP packets are exchanged between the end hosts as plain text (without any encryption). As Internet uses PSDN (Packet Switching Data Network) anybody who has access to PSDN can access/modify the data. Hence securing data over the network is difficult. The goal of network security is to provide, authenticity, confidentiality and integrity. Confidentiality is making sure that no body other than the receiver will be able to read the data. Integrity is making sure that the data didnt get modified by intruder or by some other means while it is getting transmitted. Authenticity is making sure that the data is coming from the right sender. In this paper we propose a new data encryption algorithm based on private key (symmetric key) cryptography method. Keys are shared between two end hosts using simple algorithm. Cyber block chaining method is used while encrypting/decrypting the data. Large prime numbers are generated well in advance and kept for further key refreshments. The keys were refreshed periodically, so it gives very minimal time for the hackers to attack the system. As simple operations are used, we will be able to achieve fast and secure data encryption/decryption using this method. The behavior of the proposed approach is verified through various tests.

Christila S.Annie

Computer Science