Security Aspects
Class 12 · Computer Science
4 ideas in Class 12 Computer Science, explained in plain words, with games and quizzes to practise.
Malware Family
Part of: Malware and its fighters
Malware is software built to harm devices, steal data or trouble users. A virus hides in host files and wakes when opened by a person. A worm runs alone and spreads itself through networks. Ransomware locks or encrypts data for ransom. A trojan poses as a genuine program, opens backdoors and never self-replicates. Spy tools watch silently, ad tools push adverts, and keyloggers record keystrokes.
Why it matters. Each family enters and hurts differently, so each needs its own guard. Learners who name the family spot the attack route and the right defence.
Key words
- Malware
- : Software built to harm, steal or trouble users.
- Virus
- : Code hiding in host files, waking on opening.
- Worm
- : Standalone code spreading itself over networks.
- Ransomware
- : Malware locking data until ransom is paid.
- Trojan
- : Malware posing as a genuine program.
Try it in two minutes
- Sort five attack stories into virus, worm, ransom, trojan and spy.
- Ask which two spread by themselves.
- Name one habit blocking each entry route.
Try at home. Ask your child to list three safe download habits for the family computer.
Antivirus Spam and Safe Browsing
Part of: Malware and its fighters
Antivirus tools prevent, detect and remove malware using signature files, safe sandboxes, pattern study and live watching. Spam is unwanted bulk mail, tamed by filters and user marking. Plain page protocol sends data as it is, while the secure variant scrambles it with certificates, shown by a lock mark during payments.
Why it matters. Detection plus careful browsing stops most infections. Learners who update guards, distrust freebies and check locks keep data safe.
Key words
- Antivirus
- : Software preventing and removing malware.
- Signature
- : A code pattern identifying known malware.
- Spam
- : Unwanted bulk messages and adverts.
- Secure Protocol
- : Page rules that scramble data in transit.
Try it in two minutes
- List three infection signs like pop-ups and slowdowns.
- Mark one junk mail as spam together.
- Look for the lock mark before a fake payment page.
Try at home. Ask your child to scan one pen drive before opening its files.
Firewall Cookies and Hackers
Part of: Gates hackers and attacks
A firewall filters traffic between a trusted inside and an untrusted outside using preset rules, standing between networks or on one machine. Cookies are small files sites store on visitor machines to remember carts, logins and choices, with rogue kinds tracking users. Hackers skilled in systems split by intent: white hats fix flaws for hire, black hats break laws, and grey hats hack for challenge.
Why it matters. Gates, memory files and people skills together decide safety. Learners who set rules, manage cookies and respect intent stay on the right side.
Key words
- Firewall
- : A filter between trusted and untrusted networks.
- Cookie
- : A small file a site stores on a visitor machine.
- White Hat
- : A hacker hired to find and fix flaws.
- Black Hat
- : A hacker breaking laws for gain.
Try it in two minutes
- Write one firewall rule for a school server.
- Open browser cookie settings together.
- Sort three hacker stories by hat colour.
Try at home. Ask your child to find cookie settings and clear one unknown cookie.
Network Attacks
Part of: Gates hackers and attacks
Denial attacks flood a resource with fake requests so genuine users find it busy. Distributed floods summon zombie machines worldwide, which single-source blocks cannot stop. Intrusion is any unauthorised network activity. Snooping secretly copies traffic for later study, while eavesdropping intercepts live talks. Unscrambled data falls to both.
Why it matters. Naming each attack points to its cure: blocks, restarts, guards or scrambling. Learners who tell floods from copies from live taps respond correctly.
Key words
- Denial of Service
- : Flooding a resource so genuine users wait.
- Bot Net
- : Controlled zombie machines flooding together.
- Snooping
- : Secretly copying traffic for later study.
- Eavesdropping
- : Tapping private talks in real time.
Try it in two minutes
- Act out ten fake callers jamming one desk.
- Copy a passing note secretly versus hearing a live call.
- Name which defence fits each attack.
Try at home. Ask your child to explain why a busy site may be under flood.
What your child will practise
- Antivirus Spam and Safe Browsing: Space Quick Fire (Quick Fire)
- Firewall Cookies and Hackers: Desert Puzzle (Clue Puzzle)
- Firewall Cookies and Hackers: Ocean Quick Fire (Quick Fire)
- Malware Family: Jungle Quick Fire (Quick Fire)
- Network Attacks: Ocean Puzzle (Clue Puzzle)
- Quiz: Antivirus Spam and Safe Browsing (8 questions)
- Quiz: Firewall Cookies and Hackers (8 questions)
- Quiz: Malware Family (8 questions)
- Quiz: Network Attacks (8 questions)