I am looking to create a X.509 certificate to encrypt a payload (plaintext) (using Hybrid encryption) and send it across to a server. Can I create a SSL/TLS X.509 certificate and use that to do the encryption? Or is there a X.509 that I need to create separate for this?
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Note that for encryption only you don't need a certificate - only a key is needed. A certificate is usually part of some PKI and "encryption" is usually used in the context of some larger standard like S/MIME, so a certificate needs to adhere to what PKI and S/MIME requires. – Steffen Ullrich Jun 15 '23 at 02:58