Create a key:
To export a public key:
gpg --armor --export firstname.lastname@example.org > public_key.asc
Export a public key into file public.key:
gpg --export -a "User Name" > public.key
Create a file called 'public.key' with the public key for User Name:
gpg --export -a "User Name"
Export a private key:
gpg --export-secret-key -a "User Name" > private.key
Import a public key:
gpg --import public.key/.asc
Decrypt the file:
gpg --decrypt file.pgp
Decrypt a GPG-encrypted file:
gpg --output original_message.txt --decrypt message.txt.gpg
Import a private key (not work everywhere):
gpg --allow-secret-key-import --import private.key
Delete a public key (from your public key ring):
gpg --delete-key "User Name"
NOTE! If there is a private key on your private key ring associated with this public key, you will get an error! You must delete your private key for this key pair from your private key ring first.
Delete an private key (a key on your private key ring):
gpg --delete-secret-key "User Name"
List the keys in your public key ring:
List the keys in your secret key ring:
To generate a new key pair:
Sign a file using your private key:
gpg --sign message.txt
Verify a digital signature of a GPG-signed file:
gpg --verify message.txt.gpg
Generate a short list of numbers that you can use via an alternative method to verify a public key:
(This creates the file fingerprint with your fingerprint info.)
gpg --fingerprint > fingerprint
gpg -e -u "Sender User Name" -r "Receiver User Name" somefile
Encrypt a file using a recipient's public key:
gpg --encrypt --recipient email@example.com message.txt
gpg -d mydata.tar.gpg
–gen-revoke creates a revocation certificate, which when distributed to people and keyservers tells them that your key is no longer valid, see http://www.gnupg.org/gph/en/manual/r721.html
–edit-key allows you do do an assortment of key tasks, see http://www.gnupg.org/gph/en/manual/r899.html
Use Case *.1: Mentioned above were the commands for exporting and importing secret keys, and I want to explain one reason of why maybe you'd want to do this. Basically if you want one key-pair for all of your computers (assuming you have multiple computers), then this allows you export that key-pair from the original computer and import it to your other computers.
Use Case *.2: Mentioned above were the commands for exporting and importing secret keys, and I want to explain one reason of why maybe you'd want to do this. Basically, if you belonged to a group, and wanted to create a single key-pair for that group, one person would create the key-pair, then export the public and private keys, give them to the other members of the group, and they would all import that key-pair. Then a member of the group or someone outside could use the group public key, encrypt the message and/or data, and send it to members of the group, and all of them would be able to access the message and/or data. Basically you could create a simplified system where only one public key was needed to send encrypted stuffs to muliple recipients.