> In the manpage of ssh, the client is able to ask for a non-encryption
> session.
> Then I use the following to connect to a server running at 205.178.15.4.
>
> ./ssh -c none 205.178.15.4
>
> However, I always get the following message.
> "Selected cipher type none not supported by server."
> The ssh1 I am using is ssh1.2.27. I assume I am doing something
> wrong here because if the client has an option to disable the encryption
>
> the server should have the option too.
IIRC this cypher type has to be compiled in to the client and server
before they can be used. There's an assumption that SSH connections
are encrypted, and *both* ends need to agree that "none" encryption
can be used before it should be allowed. This situation means that
a client who will not allow traffic to pass in the clear cannot be
tricked into doing so. Also a *server* manager cannot be tricked into
allowing traffic to pass in the clear. For example: a server manager
who has disables "telnet" because he doesn't like clear-text connections
to his machine cannot be tricked into allowing it using SSH when he
expects SSH traffic to be encrypted.
--
David Pick
