No warning message is displayed for "none" cipher

Damien Miller djm at
Fri Jan 5 23:01:05 EST 2007

On Fri, 5 Jan 2007, ponraj wrote:

> Hello all,
> I tried to connect to the server that supports protocol 1:
> # ssh -1 -o "cipher none" remotehost
> <No valid SSH1 cipher, using 3des instead>

openssh does not support the "none" cipher. Any traces of it in the code
are legacy and/or paranoia.

There are 3rd party patches that add support for the "none" cipher. We
do not recommend their use, and obviously don't support them. This has
been discussed ad nauseum on this mailing list - please have a look at
the archives.


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