Encrypted data transmission through high frequency/very high frequency links

Abstract

The end of the last decade saw an immense growth in the field of information technology, worldwide. The concept of a 'Global Village' brought people closer from all over the world by providing them instant access to information. The quest for better communication devices has resulted in the production of communication systems that have information transfer characteristics approaching the ideal. In this project, titled 'Encrypted Data Transmission Though HF/VHF Link’, we have interfaced a Windows based personal computer with an HF transceiver to establish a communication system that transmits text data in encrypted form. The encryption algorithm is the DES, Data Encryption Standard, which is a F1PS approved cryptographic algorithm. This standard is currently being used in all Federal Institutions of the United States of America. This report has been divided into three sections. Section I is an introduction to data communication. It contains the necessary background required for the study of this report. Section II is a detailed account of Cryptography whereas Section III gives the details of the DES Algorithm and the hardware implementation of the project.