Learning Outcomes: 1. Explain security mechanisms and security services, encryption techniques, network intrusion detection systems (NIDS) and firewalls, network security 2. Appraise security problems and threats to data and IT systems. 3. Analyze information security risks across diverse settings including the internet and WWW based commerce systems, clouds, funds transfer systems etc. 4. Formulate information security mechanism for a given business environment. 5. Distinguish between ethical and unethical practices in relation to information systems