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 best ps4 headset under 100 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] 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. -q Quiet. -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