Configure GPG Passphrase

Verify Your Primary "Certify" Key Is Available

For advanced users who deleted their "certify" capability secret key, you need to restore it back for key creations. You can verify it by using the following command:

$ gpg --list-secret-keys

Example:

$ gpg --list-secret-keys

...

---------------------------

sec   rsa4096 2020-01-10 [C]

      AC51A10307C10B2A4BB1C89AF5EF57A0FB4EF0EF

uid           [ultimate] "Shotgun" John, Smith (Main ID) <john.smith@email.com>

You want to observe the key with [C] capability and the sec label does not have a hash ("sec#"). If it does, you need to restore the key by loading the backup copy and use the following command to restore it:

$ gpg --import /path/to/you/key.asc

Update/Change Passphrase

Now that you're done, it's time to update/change the passphrase.

Obtain Your Primary Key ID

We start off by obtaining your primary key ID. This is by using the following command and find your key:

$ gpg --list-secret-keys

Example:

$ gpg --list-secret-keys

...

---------------------------

sec   rsa4096 2020-01-10 [C]

      AC51A10307C10B2A4BB1C89AF5EF57A0FB4EF0EF

uid           [ultimate] "Shotgun" John, Smith (Main ID) <john.smith@email.com>

You want the long string under the [C] key. In the example above, it is: AC51A10307C10B2A4BB1C89AF5EF57A0FB4EF0EF.

Edit Primary Key

With the key ID identified, it's time to edit the key. Use the following command pattern to edit the key:

$ gpg --expert --edit-key <key-id>

From the example above, it is:

$ gpg --expert --edit-key AC51A10307C10B2A4BB1C89AF5EF57A0FB4EF0EF

You will be presented with the gpg key editor's main menu. It looks something like:

gpg (GnuPG) 2.2.12; Copyright (C) 2018 Free Software Foundation, Inc.

This is free software: you are free to change and redistribute it.

There is NO WARRANTY, to the extent permitted by law.

Secret key is available.

sec  rsa4096/F5EF57A0FB4EF0EF

     created: 2020-01-10  expires: never       usage: C   

     trust: ultimate      validity: ultimate

[ultimate] (1). "Shotgun" John, Smith (Main ID) <john.smith@email.com>

gpg>

Change Password

Now that everything is done, you may proceed to change the passphrase using passwd command. Here's an example:

gpg> passwd 

You'll be asked for passphrases for numerous cases, such as:

1. Your original passphrase for verification
2. Entering new passphrase twice
3. Re-confirm with new passphrase

Save and Quit

Once everything is done, you may quit and save. Type quit and remember to confirm the save.

gpg> quit

Save changes? (y/N) y

That's all about configuring passphrase for GnuPG.