Question at position 19 What message does GPG show if the signature verification is successful?Verification successfulGood signature Signature verifiedVerification doneClear my selection单项选择题
A
Verification successful
B
Good signature
C
Signature verified
D
Verification done

Question

Question at position 19 What message does GPG show if the signature verification is successful?Verification successfulGood signature Signature verifiedVerification doneClear my selection

BlackTom AI · Accepted Answer

GPG prints the literal phrase "Good signature" when it verifies a digital signature successfully.

1. Relevant knowledge points and concepts
- GPG (GNU Privacy Guard) verifies detached or inline digital signatures using a signer's public key. The verifier computes a message digest (hash) of the data and compares it to the decrypted digest extracted from the signature using the signer's public key. A matching digest means the signature is cryptographically valid. GPG reports verification results with specific textual messages; the canonical success message is "Good signature".

2. Complete reasoning process step by step
- GPG reads the signed data and the attached/associated signature block.
- It computes the hash of the received data (e.g., SHA256) — this is the verifier’s digest.
- GPG uses the signer’s public key to decrypt the signature packet, recovering the digest the signer produced when signing.
- It compares the decrypted digest to the computed digest. If they are identical, the signature is valid (data unchanged and created by the holder of the corresponding private key).
- Upon a match, GPG emits the success message: "Good signature" (often preceded by lines like "gpg: Signature made ..." and followed by "gpg: Good signature from 'Name <email>'").

3. Intermediate steps / checks
- Hash computation (verifier): compute H(data).
- Decrypt signature with public key: obtain H'(data).
- Compare H(data) ?= H'(data). If equal → success.

4. Why the correct answer is correct
- The question asks for the exact message GPG shows on successful signature verification. The standard GPG output uses the phrase "Good signature" to denote a successful verification; that exact wording is what the program prints.

5. Why other options are incorrect
- "Verification successful", "Signature verified", and "Verification done" are reasonable synonyms but are not the exact phrases GPG uses. GPG's standard output uses "Good signature", not those alternatives.

6. Conclusion
- Therefore the correct choice is "Good signature", which matches the provided answer.

Question at position 19 What message does GPG show if the signature verification is successful?Verification successfulGood signature Signature verifiedVerification doneClear my selection单项选择题

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