The sender’s email client generates a random key which is used to encrypt the message. Private keys can also be used to decrypt messages encoded with the matching public key. Public keys are shared with anyone to whom you want to send encrypted messages, whereas private keys are never shared with anyone else. To use OpenPGP, you must have a public and private key pair. OpenPGP uses the principle of pairs of public and private (or “secret”) encryption keys. It also lets you digitally sign a message so your recipient can be confident the message hasn’t been altered in transit. Then, only the people you want to read your message will be able to do so. Thunderbird’s OpenPGP integration allows you to encrypt a message. Based on the freeware versions of Phil Zimmerman’s Pretty Good Privacy (PGP), it’s now very much its own thing. Thunderbird uses OpenPGP for encryption, which is a free, nonproprietary protocol. This integration means you no longer need add-ons like Enigmail. Version 78.2.1 of the Thunderbird email client has support for end-to-end encryption (e2ee) built right in.
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