143. AQA A Level SLR21 Symmetric & asymmetric encryption
About this video
AQA Specification Reference
A Level 4.9.3.2
In this video we take a look at the two main forms of encryption you need to know about for the exam: Symmetric and Asymmetric.
Key questions:
- How does encryption work?
- What is the difference between symmetric and asymmetric encryption?
00:00 Symmetric and asymmetric encryption
00:06 Intro
00:11 What is encryption?
00:21 Simple encryption using Caesar cipher
00:54 Symmetric encryption
01:43 Asymmetric encryption
05:33 Key questions
05:45 Going beyond the specification
05:52 How easy is it to crack an encryption key?
06:56 Outro
Last updated: 30.10.25
