$FreeBSD: stable/10/tools/build/options/WITH_OPENSSH_NONE_CIPHER 245527 2013-01-17 01:51:04Z bz $
Set to include the "None" cipher support in OpenSSH and its libraries. Additional adjustments may need to be done to system configuration files, such as .Xr sshd_config 5 , to enable this cipher. Please see

a /usr/src/crypto/openssh/README.hpn for full details.