312-50V13 · Question #34
What is correct about digital signatures?
The correct answer is A. A digital signature cannot be moved from one signed document to another because it is the hash. This question evaluates understanding of how digital signatures are tied to the content they sign.
Question
Options
- AA digital signature cannot be moved from one signed document to another because it is the hash
- BDigital signatures may be used in different documents of the same type.
- CA digital signature cannot be moved from one signed document to another because it is a plain
- DDigital signatures are issued once for each user and can be used everywhere until they expire.
How the community answered
(47 responses)- A89% (42)
- B6% (3)
- C2% (1)
- D2% (1)
Why each option
This question evaluates understanding of how digital signatures are tied to the content they sign.
A digital signature is fundamentally a cryptographic hash of the document content, encrypted with the signer's private key. Any alteration to the document, even minor, will change its cryptographic hash, causing the original signature to become invalid for the modified document, thereby preventing its reuse or transfer.
Digital signatures are content-dependent; they are tied to a specific document's content and cannot be reused for different documents, even of the same type, without invalidating the signature.
A digital signature is not merely a 'plain hash'; it is an encrypted hash, and its immovability stems from the cryptographic binding of the hash to the document's content, not just being a plain hash.
Digital signatures are generated uniquely for each document based on its content and the signer's key, not issued once per user for universal use until expiration.
Concept tested: Digital signature integrity and non-reusability
Source: https://docs.microsoft.com/en-us/windows/win32/seccrypto/digital-signatures
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