1. Firstly, generate your public/private keys using ssh-keygen
% ssh-keygen -t rsa
You must use the -t option to specify that you are producing keys for SSHv2 using RSA. This will generate your id_rsa and id_rsa.pub in the .ssh directory in your home directory. I strongly suggest using a passphrase.
2. Now copy the id_rsa.pub to the .ssh directory of the remote host you want to logon to as authorized_keys2 .
[Note: If you have more than one host from which you want to connect to the remote host, you need to add the local host’s id_rsa.pub as one line in the authorized_keys2 file of the remote host, i.e., you can have more than one entry. Thanks to Jinn Koriech for pointing this out. Also, you need to ‘chmod 644 authorized_keys2’ to make it unwritable to everybody apart from the user. Thanks to Matthew Lohbihler for this info.]
You are basically telling the sshd daemon on the remote machine to encrypt the connection with this public key and that this key is authorized for version 2 of the ssh protocol. Try using something secure like scp for this copying.
% scp ~foo/.ssh/id_rsa.pub [email protected]:~foo/.ssh/authorized_keys2
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Convert OpenSSH? to IETF SECSH key file
Usage: ssh-keygen [options]
-b bits Number of bits in the key to create.
-c Change comment in private and public key files.
-e Convert OpenSSH to IETF SECSH key file.
-f filename Filename of the key file.
-g Use generic DNS resource record format.
-i Convert IETF SECSH to OpenSSH key file.
-l Show fingerprint of key file.
-p Change passphrase of private key file.
-y Read private key file and print public key.
-t type Specify type of key to create.
-B Show bubblebabble digest of key file.
-C comment Provide new comment.
-N phrase Provide new passphrase.
-P phrase Provide old passphrase.
-r hostname Print DNS resource record.
-G file Generate candidates for DH-GEX moduli
-T file Screen candidates for DH-GEX moduli
ssh-keygen -e -f id_dsa.pub >id_dsa.pub.ssh