Configuring my device(atmel embedded board) only logging permission to me : deny all other users trying to log in

First I will explain my needs. I want to configure my device (Atmel Embedded Board), for log in without password through SSH. I Googled it and found out the solution for that. Now I can log in to the device without password.

But here my device is connected to a big network and anyone can log in to the device if they know the password. So I want to configure it so that I'm the only person who can log in to that device without password (Already configured for that) and anyone who I share my key configuration with. Anyone else who tries to log in should fail. It's for security purposes and part of my project.

Please give some threads soon. It will be very helpful for me

Disable password based logins. Do not share your key with anyone, everybody should have their own key.

Originally Posted by Emerson Disable password based logins. Do not share your key with anyone, everybody should have their own key.

That one is not working . actually i want to do setting in the target device or my pc?? in my pc i did the configuration for without password(i mean keys) . i am editing the file in my pc "/etc/ssh/sshd_config" for configuring what i want to do with target device..that means i m the only person to log in to target device . but whatever edited on "/etc/ssh/sshd_config" not giving any effect . even if the other users can log in to the target device . i dont want that . i need one to one connetion even if i place the target device put in big network . thats what i need . please give some threads