The most efficient way to distribute a message to several people is to encrypt the message using the random key. Why not just use the recipient’s public key to encrypt the message? This would work for messages sent to a single recipient, but it would be too cumbersome for those sent to multiple people. The random key can then be used to decrypt the encoded message. The recipient’s email program uses the recipient’s private key to decrypt the random key. The random key is then encrypted with the recipient’s public key, and the encrypted message and key are then sent to the recipient. 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.
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