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3.6 Fundamentals of Cyber SecurityDeep Dive

Deep Dive: Encryption

Part of Prevention Methods · GCSE GCSE Computer Science revision

This deep dive covers Deep Dive: Encryption within Prevention Methods for GCSE Computer Science. Revise Prevention Methods in 3.6 Fundamentals of Cyber Security for GCSE Computer Science with 19 exam-style questions and 18 flashcards. This topic shows up very often in GCSE exams, so students should be able to explain it clearly, not just recognise the term. It is section 5 of 11 in this topic. Use this deep dive to connect the idea to the wider topic before moving on to questions and flashcards.

Topic position

Section 5 of 11

Practice

19 questions

Recall

18 flashcards

Deep Dive: Encryption

Types and Uses of Encryption

Symmetric Encryption:

  • How it works: Same key used to encrypt AND decrypt
  • Advantages: Fast, efficient for large amounts of data
  • Disadvantages: Key must be shared securely between parties
  • Examples: AES (Advanced Encryption Standard), DES

Asymmetric Encryption:

  • How it works: Two keys - public key to encrypt, private key to decrypt
  • Advantages: Public key can be shared openly; private key stays secret
  • Disadvantages: Slower than symmetric encryption
  • Examples: RSA, ECC (Elliptic Curve Cryptography)

Common uses of encryption:

  • HTTPS: Encrypts web traffic (look for padlock in browser)
  • Email encryption: Protects message contents (e.g., PGP, S/MIME)
  • Full disk encryption: Protects data on stolen laptops/phones (e.g., BitLocker, FileVault)
  • VPN: Creates encrypted tunnel for all network traffic
  • Messaging apps: End-to-end encryption (e.g., WhatsApp, Signal)

Keep building this topic

Read this section alongside the surrounding pages in Prevention Methods. That gives you the full topic sequence instead of a single isolated revision point.

Deep Dive: FirewallsDeep Dive: Multi-Factor Authentication (MFA)The Security CastleNetwork Security Overview

Practice Questions for Prevention Methods

What is the primary purpose of a firewall?

  • A. To encrypt data sent over a network
  • B. To monitor and filter network traffic using rules
  • C. To scan files for viruses and malware
  • D. To create strong passwords for user accounts
1 markfoundation

Explain how penetration testing can improve the security of a network.

3 marksstandard

Quick Recall Flashcards

19 questions on Prevention Methods — practise free

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Deep Dive: Multi-Factor Authentication (MFA)