ITPEC FE Subject A October 2024 Question 29
ITPEC FE Subject A October 2024 — Question 29 of 60
Asymmetric encryption — confidentiality — encrypting so only the receiver can decrypt.
Rule: encrypt with receiver's PUBLIC key → only receiver's PRIVATE key can decrypt.
Why not others:
- (a) Pre-shared secret key = symmetric encryption, not asymmetric
- (b) Sender's private key = digital signature (proves identity, not confidentiality)
- (d) Sender's public key = anyone can decrypt → zero confidentiality
Key rule: confidentiality → encrypt with receiver's public key.
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