Pearson Edexcel GCSE Computer Science (1CP2)Specification point 5.3.2

Edexcel 1CP2 5.3.2: Protecting digital systems

The free BugBot lessons that teach this point, a robot to try it on, and the past-paper questions that test it.

Lessons that teach it

1. F11.6 Encryption Cyber security
   Plaintext, keys and ciphertext, the Caesar cipher, symmetric and asymmetric, and a secret over the radio.
2. F11.8 Writing secure programs Cyber security
   Validating input, access levels in code, and testing for security.

Try it on a robot

The task from F11.6 Encryption, running here. Change the program and press Run.

Past paper questions on this

Real exam questions that test this, each worked through with a program you can run.

• Edexcel 1CP2 June 2024 Paper 2, Question 2: Choose the right lines to make a Caesar cipher with ord() and chr() 10 marks

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