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EnglandComputer ScienceQuick questions
1.3 Exchanging data
Quick questions on Compression, encryption and hashing - OCR A-Level Computer Science H446
3short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is q1?Show answer
State one type of file for which lossless compression is essential and explain why. [2 marks]
What is q2?Show answer
Explain the key distribution problem that symmetric encryption faces. [2 marks]
What is q3?Show answer
State why a website stores a hash of a password rather than the password itself. [1 mark]
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