> For the complete documentation index, see [llms.txt](https://linux.microcisco.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://linux.microcisco.com/linux-how-to-do/sysadmin/security/ssh-open-format.md).

# SSH Open Format

## How To?

### The Problem: SSH2-formatted keys

You receive an open-ssh-formatted public key looking like this:

```
---- BEGIN SSH2 PUBLIC KEY ----
Comment: "rsa-key-20160402"
AAAAB3NzaC1yc2EAAAABJQAAAgEAiL0jjDdFqK/kYThqKt7THrjABTPWvXmB3URI
pGKCP/jZlSuCUP3Oc+IxuFeXSIMvVIYeW2PZAjXQGTn60XzPHr+M0NoGcPAvzZf2
u57aX3YKaL93cZSBHR97H+XhcYdrm7ATwfjMDgfgj7+VTvW4nI46Z+qjxmYifc8u
VELolg1TDHWY789ggcdvy92oGjB0VUgMEywrOP+LS0DgG4dmkoUBWGP9dvYcPZDU
F4q0XY9ZHhvyPWEZ3o2vETTrEJr9QHYwgjmFfJn2VFNnD/4qeDDHOmSlDgEOfQcZ
Im+XUOn9eVsv//dAPSY/yMJXf8d0ZSm+VS29QShMjA4R+7yh5WhsIhouBRno2PpE
VVb37Xwe3V6U3o9UnQ3ADtL75DbrZ5beNWcmKzlJ7jVX5QzHSBAnePbBx/fyeP/f
144xPtJWB3jW/kXjtPyWjpzGndaPQ0WgXkbf8fvIuB3NJTTcZ7PeIKnLaMIzT5XN
CR+xobvdC8J9d6k84/q/laJKF3G8KbRGPNwnoVg1cwWFez+dzqo2ypcTtv/20yAm
z86EvuohZoWrtoWvkZLCoyxdqO93ymEjgHAn2bsIWyOODtXovxAJqPgk3dxM1f9P
AEQwc1bG+Z/Gc1Fd8DncgxyhKSQzLsfWroTnIn8wsnmhPJtaZWNuT5BJa8GhnzX0
9g6nhbk=
---- END SSH2 PUBLIC KEY ----
```

And want to convert it to an ssh key format like this:

```
ssh-rsa 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
```

### Solution: Convert the SSH2-formatted key to Open-SSH

You can do this with a very simple command:

```
ssh-keygen -i -f ssh2.pub > openssh.pub
```

The command above will take the key from the file ssh2.pub and write it to openssh.pub.

If you just want to look at the open-ssh key material, or have it ready for copy and paste, then you don’t have to worry about piping stdout into a file (same command as above, without the last part):

```
ssh-keygen -i -f ssh2.pub
```

This will simply display the public key in the Open-SSH format.

A more practical example of this might be converting and appending a coworker’s key to a server’s authorized keys file. This can be achieved using the following command:

```
ssh-keygen -i -f coworker.pub >> ~/.ssh/authorized_keys
```

After this a coworker, using the according private key will be able to log into the system as the user who runs this command.

#### The Other Direction: Converting SSH2 keys to the Open-SSH Format

The opposite — converting **Open-SSH to SSH2 keys** — is also possible, of course. Simply use the **-e** (for *export*) flag, instead of **-i** (for import).

```
ssh-keygen -e -f openssh.pub > ssh2.pub
```


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