Security Threats

1. Threat Sources

2. Software threats

2.1. Viruses

2.2. Worms

2.3. Spyware

2.4. Blended threats

3. Threat sources

3.1. Human error

3.2. Disgruntled employees and ex-employees

3.3. Other internal attackers

3.4. External hackers

3.5. Natural disasters

4. Types of threats

4.1. Misuse of computer systems

4.2. Theft

4.3. Computer-based fraud

4.4. Cyber-terrorism

4.5. Cyber-espionage

4.6. Phishing

4.7. Denial-of-service