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条目 (4+)
ProPublica: The World's Email Encryption Software Relies on One Guy, Who is Going Broke
https://www.propublica.org/article/the-worlds-email-encryption-software-relies-on-one-guy-who-is-going-broke
PGP Email Encryption Tutorial: A Basic Guide To GPG
https://thetinhat.com/tutorials/messaging/how-to-use-pgp.html