![]() Private key – kept secret and used to decrypt own mail.They also have a public key, which they freely so that other people can use it to send them encrypted emails. The important thing to remember, however, is that PGP uses public-key cryptography.Įach user has a private key which they keep secret and use to decrypt emails sent to them using their public key. The details of how PGP works are, to be honest, rather complicated. It can also be used for signing and encrypting all sorts of other stuff but is mainly used to secure emails. PGP does have a number of issues (discussed below), but it is still the most widely used email encryption system, and therefore the most interoperable with others no matter which platform or email service they use.
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