dropbear key认证，禁止密码认证 dropbear 挺好的sshd 客户端，占用资源小，对于我这种资源控，是再合适不过的了。不过dropbear的文档实在是少。自己琢磨了下key认证。好禁止密码认证。共享给大家key 认证和opensshd一样。＃在ｒｏｏｔ用户目录下创建．ｓｓｈ　文件夹 mkdir -p ~/.ssh #创建公共key文件 cat authorized_keys ＃把公共ｋｅｙ拷贝到authorized_keys ＃下边很关键 设置authorized_keys权限 $ chmod 600 authorized_keys 设置.ssh目录权限 $ chmod 700 -R .ssh 重启下就可以用ｋｅｙ登陆了。禁止密码认证，需要更改/etc/xinetd.d/dropbear 文件service ssh { socket_type = stream only_from = 0.0.0.0 wait = no user = root protocol = tcp server = /usr/sbin/dropbear server_args = –i -s port = 22 type = unlisted disable = no }红色是关键，只需更改就可以了。

debian 下 dropbear 修改端口 修改/etc/xinetd.d/dropbearservice dropbear { socket_type = stream only_from = 0.0.0.0 wait = no user = root protocol = tcp server = /usr/sbin/dropbear server_args = -i disable = no port = 21413 type = unlisted }禁止root登陆，只需要修改server_args = –i  为server_args = -i -g