How to protect public and private keys

Hi there,

I've recently set up open vpn.

On my windows box (the client) I have put a ca.crt and client1.crt and client1.key into the config directory. These keys were made on a totally seperate server (different from the openVPN server).

If someone got a hold of my ca.crt, what would stop them from creating their own client keys on a server of their own, and using them to connect to my vpn?

Cheers
jonnytabpniAsked:
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rpkhareCommented:
It is recommended to keep the Private Keys on a separate disk like USB Drives etc. But why you want to protect the Public Keys?
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jonnytabpniAuthor Commented:
can't someone just create their own private keys themselves?

All I had to do was use easy-rsa and run ./build-key client1

Is ca.crt a public or private key?
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rpkhareCommented:
Even if someone creates a private key, they will not be able to decrypt. Creation of keys includes randomly generated data which is continuously refreshed. It will always be unique.
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jonnytabpniAuthor Commented:
I'm really sorry but my knowledge of PKI is very bad!

I understand that no one will be able to decrypt unless they use the correct private key.

But my question is that, if someone creates their own private key, will they be able to connect to the vpn and use my resources?
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rpkhareCommented:
I have no knowledge of VPN. But in case your VPN requires your Private Key for login then no other private key will work.
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jonnytabpniAuthor Commented:
hmm that's the thing I'm not sure about. I generated all my certs and keys on a totaly seperate server.

The openVPN server didn't have an option to specify *which* private keys are allowed..
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rpkhareCommented:
Here you can find how it works:
http://en.wikipedia.org/wiki/OpenVPN
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