If your daily activity requires loging in a lot of Linux systems through SSH, you will be happy to know (if you don't already) that there's a way to allow secure, authenticated remote access, file transfer, and command execution without having to remember passwords for each individual host you connect.
The $HOME/.ssh/authorized_keys file contains the RSA keys allowed for RSA authentication. Each line contains one key, which consists of the following fields: options, bits, exponent, modulus and comment. The first field is optional, bits, exponent and modulus fields give the RSA key and the last field isn't used at all in the authentication process, but it will be somewhat convenient to the user, for instance to know which key is for which machine.
Before we start, make sure your computer has a ssh client installed and the remote Linux system has ssh installed and sshd running, with RSA authentication enabled (RSAAuthentication yes in /etc/ssh/sshd_config).
First, you will need to generate the local RSA key