“.ssh” is a hidden directory which is in /root or /home/user. you’ve to look inside the directory, and you’ll find the ‘known_host’ file, it stored all the public_key for all the pc that applied ssh to our pc.

to make people can ssh to pc A without password,
pc A generate key gen –#ssh-keygen
follow the instruction and you’ll find there are 2 more file in .ssh which is ‘id_rsa’(A’s private key) and ‘id_rsa.pub’(B’s public key)
pc B also have to generate key gen and have the keys

then, B pass it’s public key(only the key, not the file) to A and stored in A’s /.ssh/id_rsa.pub
Still in pc A : #cat id_rsa.pub > authorized_keys
// copy the keys and save it into file authorized keys
#service sshd restart

or in malay, klu comp A ada file /root/.ssh/authorized_keys, comp lain boleh masuk comp A tanpa pasword (comp. lain – comp. yg ada public key dlm authorized_keys)

this is for learning method using red hat, dont do harm to people!!