ITPEC IP April 2020 Question 39
ITPEC IP April 2020 — Question 39 of 100
A message encrypted for Mr. B with his public key is decrypted with Mr. B's private key. Anyone may use the recipient's public key to protect a confidential message, but only the holder of the paired private key can recover it.
Answer (d)
Why not others:
- Mr. A's keys are not the matching pair for encryption addressed to B
- Mr. B's public key performs the encryption side and cannot replace the secret private key for decryption
Key rule: For confidentiality in public-key cryptography, encrypt with the recipient's public key and decrypt with the recipient's private key.
AI-generated — may contain errors
The original exam layout is preserved in the image so diagrams, formulas, tables, and code remain accurate.
This question comes from an official ITPEC past paper. ITPEC Practice is an independent study tool and is not affiliated with ITPEC. See the official IP past-paper collection or Report an issue.