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secure shell (ssh)

Two machines running a server and a client running respectively can be connected securely via ssh.
 ssh user@serverIP
example:
ssh tom@203.159.11.42
Every time a user logs in to the server user have to provide password for getting into the server.Whereas passwordless authentication using the public key is considered more secure while loggin to a remote server. For that the following steps should be followed:

1. Generate public/private rsa key pair:
ssh-keygen -t rsa
When password is asked just hit a "ENTER" to leave it empty

2.Now use ssh to create a directory ~/.ssh as user (e.g. "tom") on server(e.g. 203.159.11.42).
ssh tom@203.159.11.42 -p .ssh

3.Copy key to remote server
cat .ssh/id_rsa.pub | ssh tom@203.159.11.42 'cat >> .ssh/authorized_keys'

After finishing these three steps, login to the remote server with ssh will not require password.
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