newbie needs helps to configure ssh2

[Minh Dang-Recalt]

Hello,

I installed ssh-2.4.0-1.i386.rpm on two linux machine.
I want the machine A where is running sshd2 could be accessed only by
machine B with host based authentification and with machine B's public key !
I don't want to type the password each time i want to connect to the machine
A.
However i want any other machines to be authentified with hostbased,
publickey and password !
How can i do it ?
Any help will be appreciated !

Minh