Q:

How can I create my Own certificates and key files?

I have been reading the Corda docs a bit, and recently became interested in create my own certificates and key files. Is there a way to achieve that?

A:

Have a look here for usage examples: https://docs.corda.r3.com/releases/3.3/bridge-configuration-file.html?highlight=keytool. Here it’s used to create keys for bridge-float tunnel.
There’s also an experimental open PR that can help: https://github.com/corda/corda/pull/5101

