Which command encrypts a tar.gz archive using the public key associated with Evan?

• A. gpg -d -R Evan file.tar.gz
• B. gpg --list-keys
• C. gpg -e -R Evan file.tar.gz
• D. tar -zcvf file.tar.gz

Answer: (C)

Encrypting for a specific recipient requires two things: you perform encryption, and you specify the recipient’s public key. The command uses the encryption flag to perform the operation and designates Evan’s key as the recipient, so the resulting data is encrypted with Evan’s public key. Only Evan, who holds the corresponding private key, can decrypt it. The file being encrypted is the input archive (file.tar.gz), and the output will be a new encrypted file (typically file.tar.gz.gpg). The other options shown would either decrypt data, list available keys, or create an unencrypted tarball, which doesn’t meet the requirement of encrypting for Evan.