ITPEC IP April 2023 Question 39
ITPEC IP April 2023 — Question 39 of 100
A and C describe digital-signature benefits: sender verification and detection of message tampering. The sender signs a digest with the private key, and the recipient verifies it with the corresponding public key and certificate. Successful verification supports authenticity and integrity.
Answer (b)
Why not others:
- A is appropriate because the signature can be linked to the certified signer's key
- B is not a signature property; preventing others from reading e-mail requires encryption
- C is appropriate because a changed message produces a digest that fails verification
- (a), (c), and (d) include B or omit A or C
Key rule: Digital signatures protect authenticity and integrity; encryption protects confidentiality.
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