how to block all non-public key user logon?

From: Sam (s.wun_at_thales-is.com.hk)
Date: 06/03/03 

Date: Tue, 03 Jun 2003 17:31:33 +0800

Hi,

I have implemented public key logon for the authorized remote hosts, but
don't know how to block other hosts without the authorized public key.
eg. if host A is allowed to login server S with public key P, but host B
does not have publick key P of server S. I don't want host B logon to
server S even host B got the correct password of server B.

does any one know how to implement this policy?

thanks
sam

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