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trying to get my head around openssl and keys etc and I can't really work out what the (basic) difference is between keygen (ssh-keygen -t rsa) and genrsa?
I notice that genrsa is used more with certificates, but don't both of them just generate key pairs?
ssh-keygen seems the easiest tool to use to help set up ssh, because it not only generates the keys, but puts them in the right place as well.
Here's a guide to setting up ssh: http://kimmo.suominen.com/docs/ssh/
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