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Using a PGP key with email
(piefed.ca)
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this post was submitted on 11 Jun 2025
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privacy
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Signing an email generates a string that can be used with your public key to verify the contents haven’t been tampered with and that it came from you (assuming that you haven’t leaked the private key).  Encrypting an email is a different process; you’ll need the recipients public key, and they will decrypt with their private key.
The intent of the design of public key cryptography is that the public key can be shared freely without risk.
https://en.m.wikipedia.org/wiki/Public-key_cryptography
Ah ok, so it's like a MD5 sum of the email with a signature key then.
Are you trying to use an email client for proton mail without paying for plus?
No I have a paid subscription. But I'm using their Android app, as well as Thunderbird in Linux.