Cheat sheet · Class 12 · CBSE · Science Computer Science
Security Aspects cheat sheet
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CBSE Class 12 · Computer Science
Cheat sheet
Chapter 13Security Aspects
Malware family: Virus, Worm, Trojan, Ransomware, Spyware, Adware.
1. Threats
| Threat | Behaviour |
|---|---|
| Virus | attaches to files; needs a host |
| Worm | self-replicates across networks |
| Trojan | looks useful, hides harm |
| Ransomware | encrypts data, demands payment |
| Spyware / keylogger | steals information / keystrokes |
| Adware | unwanted ads |
| Phishing | fake messages/sites to steal data |
| DoS / DDoS | floods a server to deny service |
2. Protection
- Antivirus and updates.
- Firewall (hardware/software).
- Strong passwords, 2-factor authentication.
- HTTPS and encryption.
- Back up data.
3. Cookies & Hackers
- Cookies: small files storing site data; third-party cookies track users.
- White-hat (ethical) vs black-hat hackers.
4. Key Points
- Eavesdropping: snooping on data.
- Never open unknown attachments.
- Firewalls filter traffic.
- Social engineering exploits people.
Remember: Malware types | phishing & DoS | defences
Security Aspects: questions and notes
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