Verifying a GnuPG signature | LinuC Level 1 102 Exam original practice question

1.10.3Basic

Check whether a received file's digital signature can be verified with the corresponding public key.

Which command is appropriate?

Hint 1: Focus on the requirement

Identify what must change and what must remain unchanged. Then choose the command whose scope matches that requirement.

Hint 2: Check each command's role

Separate commands that display information, change state, remove data, or affect a child process.

gpg --verify file.sig file.txt: Correct. --verify checks the signature and the signed data.
gpg --symmetric file.sig: Incorrect. --symmetric performs symmetric encryption.
gpg --decrypt file.sig: Incorrect. Decryption is different from verifying authenticity.
gpg --export file.sig: Incorrect. --export writes keys and does not verify signatures.

Detailed explanation

Correctgpg --verify file.sig file.txt

Correct. --verify checks the signature and the signed data.

Incorrectgpg --symmetric file.sig

Incorrect. --symmetric performs symmetric encryption.

Incorrectgpg --decrypt file.sig

Incorrect. Decryption is different from verifying authenticity.

Incorrectgpg --export file.sig

Incorrect. --export writes keys and does not verify signatures.

An example you can run in a temporary verification environment.

printf '%s\n' 'gpg --verify file.sig file.txt'

gpg --verify file.sig file.txt

Foundation review

Check whether the command acts on the current shell, a new process, an existing process, or a file.

Use the supplied command and compare the output with the expected result.

Question IDKL-102-1164

EnvironmentGnuPGのコマンド役割確認

Last technical review2026-08-20