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Asked: 2026-05-17T21:20:52+00:00

I’m not clear on the difference between a CA key and a certificate. Isn’t

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I’m not clear on the difference between a CA key and a certificate. Isn’t a CA key simply a certificate? Let me try and clarify with an example.

I have a client and a server. I’m only trying to validate my connection to my server and not trying to establish trust to others so I don’t care about signing with a real CA.

Option 1: Generate a self-signed CA (ssCA) and use that to sign a certificate (C). I then install ssCA into the root keystore on my client and setup my server to use certificate C.

Option 2: Generate a self-signed certificate (SSC). Install SSC into the root keystore on my client. Setup my server to use certificate SSC.

The second option seems like a much simpler process. Should that still work?

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  1. Editorial Team

    Both options are valid, option 2 is simpler.

    Option 1 (setting up your own CA) is preferable when you need multiple certificates. In a company you might set up your own CA and install that CA’s certificate in the root keystore of all clients. Those clients will then accept all certificates signed by your CA.

    Option 2 (self-signing a certificate without a CA) is easier. If you just need a single certificate, then this is sufficient. Install it in the keystores of your clients and you are done. But when you need a second certificate, you need to install that again on all clients.

    Here is a link with further information: Creating Certificate Authorities and self-signed SSL certificates

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