V Rajaraman is with the Jawaharlal Nehru Centre for Advanced Scientific Research and the Indian Institute of Science, Bangalore. Several generations of scientists and engineers in India have learnt computer science using his lucidly written textbooks on programming and computer fundamentals.

In this part we will describe some of the security issues which arise in e-commerce. In particular we will describe firewalls, encryption techniques and digital signature

Encoding or scrambling data to make it difficult to decode is called encryption.

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Address for Correspondence
V Rajaraman
IBM Professor of
Information Technology JNCASR
Bangalore 560 064, India. Email:rajaram@serc.iisc.ernet.in