pgp two-factor authentication

https://remote-wiki.win/index.php/How_to_Find_Verified_Darknet_Links_for_Safer_Marketplace_Access

PGP two-factor authentication combines the encryption power of Pretty Good Privacy with a second verification step, like a hardware token or app code, adding an extra layer of security to your keys and messages so that even if your passphrase is compromised, attackers can't access your private data.