ITPEC IP April 2022 Question 43
ITPEC IP April 2022 — Question 43 of 100
A digital signature can confirm that an e-mail's content has not been falsified or altered. The sender signs a hash of the message with a private key. The recipient verifies it using the corresponding public key; if the message changes, the newly calculated hash no longer matches the signed value.
Answer (d)
Why not others:
- IMAP retrieves and manages e-mail stored on a server
- SMTP transfers outgoing e-mail between clients and servers
- an information security policy defines organizational rules but does not cryptographically verify one message
Key rule: Digital signatures provide integrity and sender authentication; encryption separately provides confidentiality.
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