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I would like to understand how e-mail encryption works.

If I want to store my already sent encrypted e-mails, are they encrypted by my public key or private key? And which key is used to sign those messages?

BB-8
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  • This is broad. There is probably no standard for email-encryption. If you are talking about GPG/PGP; your encrypted e-mails are not encrypted by any of your keys, but with the public key of the receiver. This also means, that you can't decrypt the already encrypted e-mail ever (only the receiver, as he holds the corresponding private-key). – sascha Dec 01 '17 at 12:34
  • @sascha OO, I will trust U. – BB-8 Dec 01 '17 at 13:29

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You are talking about Public-key cryptography, it does not depend on where you use it: email or files and etc.

Public key is used for encrypt messages. Private for decrypt and sign messages.

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