gpg # Initialize GPG for this user (e.g. create ~/.gnupg). Only have to run once.
gpg --gen-key # Start key generation process. Follow prompts.
2. Viewing Keys
gpg --list-keys # View public keys
gpg --list-secret-keys # View private keys
3. Exporting Public Keys
gpg --export
gpg --export --armor
4. Importing Public Keys
gpg --import /path/to/public/key/file
5. Encrypting a Message
gpg --encrypt --armor --recipient
6. Decrypting a Message
gpg encrypted_message_file
You will be prompted for the filename to use for the output of the decryption process.
7. Encrypting with a Symmetric Key
gpg --symmetric --armor message_file
8. Signing and Encrypting a Message
gpg --sign --encrypt --armor --recipient
9. Creating a Detached Signature
gpg --detach-sign --armor message_file # Sender
gpg --verify message_file.asc message_file # Recipient
10. Signing Another's Public Key
Alice is going to sign Bob's key.
# First, user A must do:
gpg --sign-key user_B
gpg --export --armor user_B > B.key
# Then, user_b must do:
gpg --import B.key
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source:http://linuxpoison.blogspot.com/2008/04/13578175801985.html