openssh reading only SOME ssh1 hostkeys from ssh

Phil Dibowitz phil at
Sat Jun 7 18:15:28 EST 2003

Darren Tucker wrote:
> 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.
> See

Ah the docs. Doh! Hey, there's another FAQ in there that's helpful. Why 
didn't google gimme that? Ah well. Thanks!

Phil Dibowitz                             phil at
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