A quick entry point might be found here: https://crypto.stackexchange.com/questions/42247/are-the-metadata-encrypted-by-pgp https://crypto.stackexchange.com/que

A quick entry point might be found here: https://crypto.stackexchange.com/questions/42247/are-the-metadata-encrypted-by-pgp https://crypto.stackexchange.com/questions/42247/are-the-met... Essentially, for most PGP workflows, PGP encrypts the body of the message but the entirety of the metadata (things like sender, recipient, subject line, basically anything you’d think of as “metadata”) are fully unencrypted.