Question : how to generate a rsa key on redhat - complatable with old systems

I need to create a key that is compatible as far back as Solaris 2 which we still have in production.

I am using Redhat ( centos 5 actually :)

I am assuming that I need a simple passphrase, 1028 bits and RSA.

If I just run the ssh-keygen command I get a great secure key, so secure that I have problems with it ;(

I can look in the man page but it takes me so long to try keys and use it for a while to learn I it does not work with older systems.  If someone has suggestions, I can compare the suggestion to the man page.

Answer : how to generate a rsa key on redhat - complatable with old systems

You need sshv1 key - yes?
ssh-keygen -b 1024 -t rsa1