OpenPGP subkeys have many benefits (well summarized on this Debian wiki page), one of them being that if you have both an encryption subkey and a signing subkey (at least), you donât need your master private key for your daily usage of OpenPGPâyou will only need it for signing someone elseâs key or to modify your own key (adding or revoking User IDs, adding or revoking subkeys, updating the prefer
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