Ciphers none error in sshd_config

All,

I am using OpenSSH-3.6.1p1 on two Redhat 7.2 i386 machines.

I am trying to transfer already encrypted files between machines. I don't want to re-encrypt the files but I do want to use ssh because of its strong authentication mechanisms (i.e. public key authentication). However, when I specify "Ciphers none" in my sshd_config file I get an error:

Starting sshd:/etc/ssh/sshd_config line 12: Bad SSH2 cipher spec 'none'.

I get the same error whether I specify Protocol 1 and or Protocol 2.

Following advice from O'Reilly's book "SSH The Secure Shell, The Definitive Guide", I tried recompiling from source using:

./configure --with-none

but it hasn't made any difference. In fact, "--with-none" isn't even listed as a configure option when I ran:

Do you need help?

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./configure --help

My question then is this, has support for no encryption (i.e. Ciphers none) been eliminated from OpenSSH or am I doing something really stupid?

James