ITPEC IP April 2024 Question 39
ITPEC IP April 2024 — Question 39 of 100
A digital signature enables the receiver to detect whether signed data has been altered. The sender signs a digest of the data with a private key. The receiver uses the corresponding public key to verify the signature against a newly calculated digest. If the data was modified after signing, the digests do not agree and verification fails.
Answer (b)
Why not others:
- (a) Compression reduces representation size but does not provide authenticated integrity
- (c) Password authentication checks a user's claimed identity and does not by itself detect changes to a received document
- (d) Filtering permits or blocks items by rules but does not cryptographically prove data integrity
Key rule: Digital signatures provide integrity, signer authentication, and support for non-repudiation; encryption is the separate primary control for confidentiality.
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.