This deep dive covers Deep Dive: Encryption within Prevention Methods for GCSE Computer Science. Revise Prevention Methods in Network Security for GCSE Computer Science with 15 exam-style questions and 18 flashcards. This topic appears less often, but it can still be a useful differentiator on mixed-topic papers. It is section 5 of 10 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 10
Practice
15 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)