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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Students type: environmental impact computing gcse
Open guide Revision guideImage representationStudents type: bitmap image file size gcse
Open guide Revision guideSound representationStudents type: sound sampling gcse computer science
Open guide Revision guideSecondary storageStudents type: secondary storage gcse computer science
Open guide Revision guidePrivacy and cyber securityStudents type: gcse cyber security privacy
Open guide Revision guideEthical and legal issues in CSStudents type: gcse computer science ethics legal
Open guide Revision guideTypes of malwareStudents type: types of malware GCSE
Open guide Revision guideLogic gates and truth tablesStudents 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.
Types of malware
GCSE Computer Science malware: virus, worm, trojan, spyware, ransomware — how each spreads, what damage it does, and basic prevention.
Ethical and legal issues in CS
GCSE Computer Science ethics and law: data protection, copyright, software licences, Computer Misuse Act, and professional responsibility.
Privacy and cyber security
GCSE Computer Science privacy and security: threats, encryption, authentication, and the human layer beyond firewalls.
Secondary storage
GCSE Computer Science secondary storage: HDD, SSD, optical, magnetic tape, cloud — capacity, speed, durability and cost trade-offs.
Sound representation
GCSE Computer Science sound: sampling rate, bit depth, file size calculation, and analogue-to-digital conversion.
Image representation
GCSE Computer Science images: pixels, resolution, colour depth, file size, metadata and compression.
Environmental impact of computing
GCSE Computer Science environmental impact: e-waste, energy use, rare earths, cloud data centres, and sustainable practice.
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