The email will look like this (the email addresses have been blurred for privacy reasons): You will see a padlock icon on the subject line of their emails. ProtonMail natively supports PGP, and all you have to do to encrypt your email is to select Sign Mail. Let’s take a look at ProtonMail – as an example. In practice, sending a message encrypted with PGP is simpler than the above explanation makes it sound. So by encrypting the symmetric key using the (asymmetric) public-key system, PGP combines the efficiency of symmetric encryption with the security of public-key cryptography. Using symmetric encryption requires, though, that a sender share the encryption key with the recipient in plain text, and this would be insecure. Public key cryptography is much, much slower than symmetric encryption (where both the sender and recipient have the same key). Why would we encrypt the encryption key itself? This might seem like a strange way to do things. Using this session key, the recipient is now able to decrypt the actual message.
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