GNU/Linux OpenSSH Key QuickRef

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Generate a SSH Key Pair:

>ssh-keygen -m PEM -t rsa
>ssh-keygen -m PEM -t rsa -C "tim" -f /home/dir/id_rsa

Convert SSH2 Public Key to OpenSSH Public Key

>ssh-keygen -i -f id_ssh2.pub > id_openssh.pub

Convert OpenSSH Public Key to SSH2 Public Key

>ssh-keygen -e -f id_openssh.pub > id_ssh2.pub

Get Key Fingerprint MD5

ssh-keyscan -p [port] [hostname] > [hostkeyfpfile]
ssh-keygen -l -f [hostkeyfpfile] -E md5

Start session with alternate key

sftp -o IdentityFile=/home/tim/.ssh/id_rsa_2 tim@server1