IGCSE Computer Science Paper 1 Word Scramble: 2.3 Encryption and 3.1 Computer Architecture (Modules 204–217)
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Word scramble
Unscramble the letters and write each key term on the line.
1
AIPETVR YKE
The secret half of a key pair. Only the owner keeps it, never sends it, and uses it to decrypt data that was encrypted with their public key.
2
TPIVEAR YKE EIRONTDPYC
Only the recipient's private key can decrypt a message encrypted with their public key. The private key stays secret on the recipient's device, so interceptors cannot read it.
3
SROSCORIRECPOM
A CPU built as an integrated circuit on a single chip. It is only the processor, not the whole computer, and is found in PCs, phones and embedded devices.
4
LAU
Arithmetic logic unit: the part of the CPU that does calculations (add, subtract) and logic decisions (AND, OR, NOT, comparisons). Results are held in the accumulator.
5
ONCRTOL TINU (UC)
The part of the CPU that decodes instructions and sends control signals to coordinate the ALU, registers, memory and other parts during the fetch-decode-execute cycle.
Answer Key
IGCSE Computer Science Paper 1 · Modules 204–217
1AIPETVR YKE → private key — The secret half of a key pair. Only the owner keeps it, never sends it, and uses it to decrypt data that was encrypted with their public key.
2TPIVEAR YKE EIRONTDPYC → private key decryption — Only the recipient's private key can decrypt a message encrypted with their public key. The private key stays secret on the recipient's device, so interceptors cannot read it.
3SROSCORIRECPOM → microprocessor — A CPU built as an integrated circuit on a single chip. It is only the processor, not the whole computer, and is found in PCs, phones and embedded devices.
4LAU → ALU — Arithmetic logic unit: the part of the CPU that does calculations (add, subtract) and logic decisions (AND, OR, NOT, comparisons). Results are held in the accumulator.
5ONCRTOL TINU (UC) → Control Unit (CU) — The part of the CPU that decodes instructions and sends control signals to coordinate the ALU, registers, memory and other parts during the fetch-decode-execute cycle.