GCSE Computer Science
Data representation and security
revision.
Binary, images, sound, and the threats that turn data into an incident.
Data representation and security guides
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Each box is a full revision page. The smaller line is the search students type — not the name of the guide.
Students type: AND OR NOT XOR truth tables GCSE
Open guide Revision guideBinary and hexadecimal conversionStudents type: binary to hexadecimal conversion GCSE
Open guide Revision guideCyber securityStudents type: types of malware gcse computer science
Open guide Revision guideBinary and data representationStudents type: binary to denary conversion gcse
Open guideBinary and data representation
From bits and overflow to hex, characters, images, sound and why compression has to throw information away — or not.
Cyber security
How systems are actually attacked — malware, people and weak configuration — and the controls that make an attack expensive.
Binary and hexadecimal conversion
GCSE Computer Science binary and hex: group bits into nibbles, digits 0–9 and A–F, and a full conversion of 156 into hexadecimal with the binary in the middle.
Logic gates and truth tables
GCSE Computer Science logic gates: AND, OR, NOT and XOR, how to fill a truth table including a 3-input circuit, and how to turn English into gates.
Keep going
More GCSE Computer Science
in the same style.
GCSE Computer Science revision for algorithms, programming, binary, networks, cyber security, systems architecture and Boolean logic — with trace tables, not hand-waving.
All Computer Science revision