O-LevelComputer ScienceData Transmission2210/12 · May/June 2020 · Q91 Mark

In symmetric encryption, what is characteristic about the key used for encryption and decryption?

AThe same key is used for both encryption and decryption

Bpublic key encrypts, a private key decrypts

CTwo different keys are used but they are mathematically linked

DThe key changes for each block of data encrypted

✓ Correct answer

A: The same key is used for both encryption and decryption

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Topic: Data Transmission, O-Level Computer Science (syllabus 2210). Multiple choice, 1 mark.
Source: O-Level Computer Science, May/June 2020 Paper 1 Variant 2, question 9.

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