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Cyber Security

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Catatan pelajaran

Cyber Security Threats

  • Brute-force attack: repeatedly tries password/PIN combinations; dictionary attack tries common words/phrases.
  • Data interception & theft: uses a packet sniffer to capture network data and steal usernames/passwords.
  • DDoS attack: floods a server with requests from many bots (compromised computers), making it unusable.
  • Hacking: exploits weaknesses (unpatched software, outdated anti-malware) to gain unauthorised access.
  • Malware: malicious software including virus (replicates, corrupts files), worm (spreads across network), Trojan (disguised as legitimate), spyware (records activity), adware (displays ads), ransomware (encrypts files, demands ransom).
  • Pharming: redirects user to a fake website by altering DNS settings or browser settings; protect with anti-malware, check URLs, look for padlock icon.
  • Phishing: sends fraudulent emails/SMS claiming to be from a reputable company to trick users into revealing details.
  • Social engineering: exploits human weaknesses (e.g., fraudulent phone calls, pretexting) to gain confidential data.

Keeping Data Safe – Access Control & Authentication

  • Access levels: set based on role – full access (create/edit/delete), read-only, no access.
  • Authentication: verifies user identity via usernames/passwords, multi-factor authentication, CAPTCHA, or biometrics (fingerprint, facial recognition, iris scan).
  • Biometrics are more secure than passwords: cannot be guessed, faked, recorded by spyware, or shoulder-surfed.

Keeping Data Safe – Software & Network Defences

  • Anti-malware: scans files/emails/websites for known malware signatures; includes anti-virus, anti-spam, anti-spyware; updates automatically.
  • Firewall: monitors incoming/outgoing traffic, filters based on rules; can be hardware (protects whole network) or software (protects individual devices).
  • Proxy server: hides user's IP address/location, filters web traffic, blocks malicious content.
  • SSL (Secure Socket Layer): encrypts data transmitted over the internet; uses digital certificate with public key for authentication.
  • Automatic software updates: ensure vulnerabilities are patched quickly without user intervention.

Keeping Data Safe – User Practices & Communication

  • Privacy settings: control personal information shared online; review regularly to prevent identity theft.
  • Check URLs: verify links before clicking (e.g., `amaz.on.co.uk` vs `amazon.co.uk`) to avoid phishing.
  • Monitor communication: phishing emails often have spelling/grammar errors, urgent tone, or lack professionalism.
  • User vigilance: lock devices, log off when not in use, do not share passwords, encrypt data, keep software up to date.

DDoS attack: attacker controls botnet to flood server with requests, denying service to legitimate users.

DDoS Attack DiagramAttackerBotnetServerOverloadedUserRequest blockedMultiple bots send simultaneous requests → server fails

Slide

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Soal latihan

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  1. 1.What is the term for a type of malware that locks a user's computer and demands payment to unlock it?

    Easy
    • ARansomware
    • BSpyware
    • CAdware
    • DTrojan
  2. 2.Which of the following is a method used to prevent unauthorised access by monitoring and filtering network traffic based on a set of rules?

    Easy
    • AFirewall
    • BProxy server
    • CAnti-malware
    • DSSL
  3. 3.A company's website becomes slow and eventually crashes because a large number of requests are sent to it from multiple compromised computers. What type of attack is this?

    Medium
    • ADDoS attack
    • BBrute-force attack
    • CPhishing attack
    • DData interception
  4. 4.Which security measure uses unique physical characteristics such as fingerprints or iris scans for authentication?

    Easy
    • ABiometrics
    • BCAPTCHA
    • CMulti-factor authentication
    • DEncryption
  5. 5.A user receives an email that appears to be from their bank, asking them to click a link and enter their login details. The email contains several spelling mistakes. What type of threat is this?

    Medium
    • APhishing
    • BPharming
    • CSocial engineering
    • DSpyware
  6. 6.An attacker repeatedly tries different combinations of a user's password to gain unauthorised access. Which type of attack is this?

    Easy
    • ABrute-force attack
    • BDictionary attack
    • CDDoS attack
    • DData interception
  7. 7.Which of the following is a type of malware that can replicate itself and spread to other computers on a network without needing to attach to a host file?

    Easy
    • AWorm
    • BVirus
    • CTrojan
    • DSpyware
  8. 8.What is the purpose of a proxy server in network security?

    Medium
    • ATo hide a user's IP address and location
    • BTo encrypt data transmitted over the internet
    • CTo scan for malware in email attachments
    • DTo manage user access levels

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