EFT Server imports the PEM format, also called the SECSH Public Key File Format. For example:
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---- BEGIN SSH2 PUBLIC KEY ---- Comment: "4096-bit RSA, converted from OpenSSH by dhopson@VMUbuntu-DSH" AAAAB3NzaC1yc2EAAAABIwAAAgEAwrr66r8n6B8Y0zMF3dOpXEapIQD9DiYQ6D6/zwor9o 39jSkHNiMMER/GETBbzP83LOcekm02aRjo55ArO7gPPVvCXbrirJu9pkm4AC4BBre5xSLS 7soyzwbigFruM8G63jSXqpHqJ/ooi168sKMC2b0Ncsi+JlTfNYlDXJVLKEeZgZOInQyMmt isaDTUQWTIv1snAizf4iIYENuAkGYGNCL77u5Y5VOu5eQipvFajTnps9QvUx/zdSFYn9e2 sulWM3Bxc/S4IJ67JWHVRpfJxGi3hinRBH8WQdXuUwdJJTiJHKPyYrrM7Q6Xq4TOMFtcRu LDC6u3BXM1L0gBvHPNOnD5l2Lp5EjUkQ9CBf2j4A4gfH+iWQZyk08esAG/iwArAVxkl368 +dkbMWOXL8BN4x5zYgdzoeypQZZ2RKH780MCTSo4WQ19DP8pw+9q3bSFC9H3xYAxrKAJNW jeTUJOTrTe+mWXXU770gYyQTxa2ycnYrlZucn1S3vsvn6eq7NZZ8NRbyv1n15Ocg+nHK4f uKOrwPhU3NbKQwtjb0Wsxx1gAmQqIOLTpAdsrAauPxC7TPYA5qQVCphvimKuhQM/1gMV22 5JrnjspVlthCzuFYUjXOKC3wxz6FFEtwnXu3uC5bVVkmkNadJmD21gD23yk4BraGXVYpRM IB+X+OTUUI8= ---- END SSH2 PUBLIC KEY ---- |
EFT Server looks for the BEGIN and END tags when importing.
The other and very common format is the OpenSSH format. If you generated your key on a *nix box, it is most likely in this format. Here is the same public key in OpenSSH format:
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ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAgEAwrr66r8n6B8Y0zMF3dOpXEapIQD9DiYQ6D6/zwor9o 39jSkHNiMMER/GETBbzP83LOcekm02aRjo55ArO7gPPVvCXbrirJu9pkm4AC4BBre5xSLS 7soyzwbigFruM8G63jSXqpHqJ/ooi168sKMC2b0Ncsi+JlTfNYlDXJVLKEeZgZOInQyMmt isaDTUQWTIv1snAizf4iIYENuAkGYGNCL77u5Y5VOu5eQipvFajTnps9QvUx/zdSFYn9e2 sulWM3Bxc/S4IJ67JWHVRpfJxGi3hinRBH8WQdXuUwdJJTiJHKPyYrrM7Q6Xq4TOMFtcRu LDC6u3BXM1L0gBvHPNOnD5l2Lp5EjUkQ9CBf2j4A4gfH+iWQZyk08esAG/iwArAVxkl368 +dkbMWOXL8BN4x5zYgdzoeypQZZ2RKH780MCTSo4WQ19DP8pw+9q3bSFC9H3xYAxrKAJNW jeTUJOTrTe+mWXXU770gYyQTxa2ycnYrlZucn1S3vsvn6eq7NZZ8NRbyv1n15Ocg+nHK4f uKOrwPhU3NbKQwtjb0Wsxx1gAmQqIOLTpAdsrAauPxC7TPYA5qQVCphvimKuhQM/1gMV22 5JrnjspVlthCzuFYUjXOKC3wxz6FFEtwnXu3uC5bVVkmkNadJmD21gD23yk4BraGXVYpRM IB+X+OTUUI8= dhopson@VMUbuntu-DSH |
To make a key
To generate the key, on a Linux computer, type:
ssh-keygen -t rsa
To convert to PEM format, on a linux box, type (assuming your public key is id_rsa.pub):
ssh-keygen
-e -f id_rsa.pub > yourfilename.pub
-i is the inverse of the -e switch
I see the fingerprint in EFT Server. How do I see the fingerprint in Linux?
Assuming your public key is id_rsa.pub, on a Linux computer, type:
ssh-keygen -l -f id_rsa.pub
This will return three things:
the bit strength (4096 )
the fingerprint (18:9f:7d:8f:e0:ab:13:56:b7:49:89:b3:07:93:9f:da )
the filename (id_rsa.pub )
The string returned from this example public key is:
4096 18:9f:7d:8f:e0:ab:13:56:b7:49:89:b3:07:93:9f:da id_rsa.pub
Linux has standard folders/files for SSH:
The SSH files are stored in "~/.ssh"
The tilde ~ is
an alias for the user home folder, e.g., /home/<your username>
The public key filename is the private key filename with .pub as the extension.
Stored (known) server fingerprints are written to known_hosts
This is used to detect "man in the middle" attacks. If the
host fingerprint changes, SSH will report an error.
The file authorized_keys
is used to store public keys
This is used to allow the user to maintain a collection of identity
keys in one place (easier to backup and restore). The authorized_keys
file is a collection of public keys, created by simply echoing
out (cat) the contents of a public key, appending it to the bottom of
the existing authorized_keys
file.
SSH keys must have 600 or more restrictive permissions
in place
If permissions are too open, SSH will report an error and refuse to
run until you correct the security problem.