To extrack hash from private.asc file

To see available keys in your system

$ gpg --list-secret-keys

If you have a backup.gpg keys with encrypted format.

Then you need a key to decode it. If you found the key in some file. Then simple import that file in your syste

$ gpg --import private.asc

If the private.asc file is in encrypted format then they ask password to decrypt and import to our system. we can also crack private.asc key by extracting hash from it by using john

$ gpg2john private.asc > private.john

To crack the hash file private.john

john --wordlist=/usr/share/dict/rockyou.txt private.john

Now, we have a password of private.asc file. Now, it’s time to import in your system.

$ gpg --import private.asc

Now, we can decode our backup.pgp file because we have a keys in your system.

$ gpg -d backup.pgp