Decrypting a GnuPG ciphertext | LinuC Level 1 102 Exam original practice question

1.10.3Basic

Decrypt backup.txt.gpg and write the result to backup.txt.

Which command is appropriate?

Hint 1: Focus on the key relationship

Identify who must decrypt the data, then distinguish confidentiality, authentication, and the direction of each key operation.

Hint 2: Key terms

Review the short definitions of SSH keys, forwarding directions, encryption, and signatures involved.

--decrypt: The GnuPG operation that decrypts an encrypted input.
--output: The GnuPG setting that selects the file receiving a result.
Ciphertext: Data in an encrypted form that is not directly readable.
Plaintext: The usable content obtained after successful decryption.
--encrypt: The GnuPG operation that encrypts input and is opposite to decryption.

Detailed explanation

Incorrectgpg --encrypt backup.txt.gpg --output backup.txt

Correct. --decrypt reads the ciphertext and --output writes the plaintext to backup.txt.

Correctgpg --decrypt backup.txt.gpg --output backup.txt

Incorrect. --encrypt performs encryption, not decryption.

Incorrectgpg --sign backup.txt.gpg --output backup.txt

Incorrect. --sign creates a signature.

Incorrectgpg --list-keys backup.txt.gpg --output backup.txt

Incorrect. --list-keys lists keys and does not decrypt files.

An example you can run in a temporary verification environment.

printf '%s\n' 'gpg --decrypt backup.txt.gpg --output backup.txt'

gpg --decrypt backup.txt.gpg --output backup.txt

Foundation review

A server identity key used by SSH clients to detect a changed endpoint.

A key pair used to authenticate a user to an SSH server.

An SSH tunnel that carries traffic between a local, remote, or dynamic endpoint.

Question IDKL-102-1161

EnvironmentGnuPGのコマンド役割確認

Last technical review2026-08-20

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