方法一：
1. 在机器Client上root用户执行ssh-keygen命令，生成建立安全信任关系的证书。
# ssh-keygen -b 1024 -t dsa
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa):
Enter passphrase (empty for no passphrase): <-- 直接输入回车
Enter same passphrase again: <-- 直接输入回车
Your identification has been saved in /root/.ssh/id_rsa.
Your public key has been saved in /root/.ssh/id_rsa.pub.
The key fingerprint is:
49:9c:8a:8f:bc:19:5e:8c:c0:10:d3:15:60:a3:32:1c root@Client
注意：在程序提示输入passphrase时直接输入回车，表示无证书密码。
上述命令将生成私钥证书id_rsa和公钥证书id_rsa.pub，存放在用户家目录的.ssh子目录中。
2. 将公钥证书id_rsa.pub复制到机器Server的root家目录的.ssh子目录中，同时将文件名更换为authorized_keys。
# scp -p .ssh/id_rsa.pub root@192.168.0.20:/root/.ssh/authorized_keys
root@192.168.0.20's password: <-- 输入机器Server的root用户密码
id_rsa.pub 100% |**************************| 218 00:00
在执行上述命令时，两台机器的root用户之间还未建立安全信任关系，所以还需要输入机器Server的root用户密码。
经过以上2步，就在机器Client的root和机器Server的root之间建立安全信任关系。下面我们看看效果：
# scp -p text root@192.168.0.20:/root
text 100% |**************************| 19 00:00
Ok!
方法二：
1、在Client上root用户执行ssh-keygen命令，生成建立安全信任关系的证书。
# ssh-keygen -b 1024 -t dsa
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa):
Enter passphrase (empty for no passphrase): <-- 直接输入回车
Enter same passphrase again: <-- 直接输入回车
Your identification has been saved in /root/.ssh/id_rsa.
Your public key has been saved in /root/.ssh/id_rsa.pub.
The key fingerprint is:
49:9c:8a:8f:bc:19:5e:8c:c0:10:d3:15:60:a3:32:1c root@Server
注意：在程序提示输入passphrase时直接输入回车，表示无证书密码。
上述命令将生成私钥证书id_rsa和公钥证书id_rsa.pub，存放在用户家目录的.ssh子目录中。
2. 将公钥证书id_rsa.pub导入到机器Client的root家目录的.ssh子目录.key文件中
Client端
# scp -p .ssh/id_rsa.pub root@192.168.0.20:/root/.ssh/id_rsa.pub.bak
root@192.168.0.20's password: <-- 输入机器Client的root用户密码
id_rsa.pub 100% |**************************| 218 00:00
Server端
# cat /root/.ssh/id_rsa.pub.bak >> /root/.ssh/.key
经过以上2步，就在机器Client的root和机器Server的root之间建立安全信任关系。下面我们看看效果：
Client端
# scp -i /root/ .ssh/id_rsa text root@192.168.0.20:/root
text 100% |**************************| 19 00:00
若ssh端口非22端口，请使用-P参数后跟端口号
Ok!
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