openssh reading only SOME ssh1 hostkeys from ssh

Darren Tucker dtucker at
Sat Jun 7 16:04:40 EST 2003

Phil Dibowitz wrote:
> However, on a few hosts, openssh has been unable to read the old rsa1
> key and has claimed:
>    debug1: Unsupported cipher 1 used in key file /etc/ssh/ssh_host_key.
>    Could not load host key: /etc/ssh/ssh_host_key
> Does anyone know why it is that openssh has this problem only sometimes,
> and if there is a way to fix it?

I think that's because those keys are encrypted with IDEA, which OpenSSH
does not support for patent reasons.  You can use ssh-keygen *from
commercial ssh* to convert the keys.


Darren Tucker (dtucker at
GPG key 8FF4FA69 / D9A3 86E9 7EEE AF4B B2D4  37C9 C982 80C7 8FF4 FA69
    Good judgement comes with experience. Unfortunately, the experience
usually comes from bad judgement.

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