# $OpenBSD: ssh_config,v 1.9 2001/03/10 12:53:51 deraadt Exp $
Host *
ForwardAgent no
ForwardX11 no
RhostsAuthentication no
RhostsRSAAuthentication yes
RSAAuthentication yes
PasswordAuthentication no
FallBackToRsh no
UseRsh no
BatchMode no
CheckHostIP yes
StrictHostKeyChecking yes
IdentityFile ~/.ssh/identity
IdentityFile ~/.ssh/id_dsa
IdentityFile ~/.ssh/id_rsa1
IdentityFile ~/.ssh/id_rsa2
Port 22
Protocol 2,1
Cipher blowfish
EscapeChar ~
5．3 SSH服务器端配置文件/etc/ssh/sshd_config，关于下面各个参数的含义请参考使用手册，此例中使用第二种认证方式(基于密钥的认证)以提高安全性。
# $OpenBSD: sshd_config,v 1.34 2001/02/24 10:37:26 deraadt Exp $
Port 22
#Protocol 2,1
#ListenAddress 0.0.0.0
#ListenAddress ::
HostKey /etc/ssh/ssh_host_key
HostKey /etc/ssh/ssh_host_rsa_key
HostKey /etc/ssh/ssh_host_dsa_key
ServerKeyBits 768
LoginGraceTime 600
KeyRegenerationInterval 3600
PermitRootLogin without-password
#
# Don't read ~/.rhosts and ~/.shosts files
IgnoreRhosts yes
# Uncomment if you don't trust ~/.ssh/known_hosts for RhostsRSAAuthentication
#IgnoreUserKnownHosts yes
StrictModes yes
X11Forwarding no
X11DisplayOffset 10
PrintMotd yes
KeepAlive yes
# Logging
SyslogFacility AUTH
LogLevel INFO
#obsoletes QuietMode and FascistLogging
RhostsAuthentication no
#
# For this to work you will also need host keys in /etc/ssh/ssh_known_hosts
RhostsRSAAuthentication no
#
RSAAuthentication yes
# To disable tunneled clear text passwords, change to no here!
PasswordAuthentication no
PermitEmptyPasswords no
# Comment to enable s/key passwords or PAM interactive authentication
# NB. Neither of these are compiled in by default. Please read the
# notes in the sshd(8) manpage before enabling this on a PAM system.
ChallengeResponseAuthentication no
# To change Kerberos options
#KerberosAuthentication no
#KerberosOrLocalPasswd yes
#AFSTokenPassing no
#KerberosTicketCleanup no
# Kerberos TGT Passing does only work with the AFS kaserver
#KerberosTgtPassing yes
#CheckMail yes
#UseLogin no
#MaxStartups 10:30:60
#Banner /etc/issue.net
#ReverseMappingCheck yes
#Subsystem sftp /usr/libexec/sftp-server
六、 生成认证密钥
当采用密钥认证方式时，第个用户在远程服务器上必须生成自己的密钥；下面我们就以实例的方式叙述此过程：
６．１ 为服务器上的用户robin生成rsa1认证密钥：
[root@mail tmp]su robin
[root@mail tmp]ssh-keygen
