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Great question. I'll answer it in several parts. Which Keys does Alice send? There are two cryptographic operations that Alice may want to do: encryption/decryption, and signing/validation. You can either use the same keypair for both, or have two separate pairs of keys. 1 keypair method: Here Alice would sign outgoing messages, and decrypt incoming ...


Alice sends a CSR (certificate signing request) to the CA, which contains her public key, her name and usually her location. This CSR is then signed to prove ownership of the associated private key. The CA uses the data in the CSR to derive a certificate which will be handed to the user afterwards. The user can then prove his identity. The CA needs to ...

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