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.
