[Ach] SSH improvements

[Tobias Millauer]

Hello everybody,

Here are some improvements to the SSH section. Do you agree with it?

-- 8.3 SSH --

# Use only Protocol 2
Protocol 2

# Disable empty passwords
PermitEmptyPasswords no

# Disable unused authentication methods
UsePAM no
IgnoreRhosts yes
RhostsRSAAuthentication no
HostbasedAuthentication no
KerberosAuthentication no
GSSAPIAuthentication no
ChallengeResponseAuthentication no

-- References --

*) Do not use Protocol V1 
(http://www.ssh.com/manuals/server-admin/44/Configuring_ssh2_for_ssh1_Compatibility.html)
*) "Speed up SSH logon by disabling GSSAPIAuthentication" 
(https://coderwall.com/p/fukoew)

P.S.: https://bettercrypto.org/ points to lo-res.org :-)

     Tobias