works as shame wall or a list of zombie nodes which is used for ssh brute force attacks

so what is ssh brute force

brute force is the try any possibility for password or any secret keyword. so ssh brute force is the try any kind of password for an user like root. its a very old style to hack any system. hackers writes algorithms or LAMERs run their LAME programs to find out the root password from 0 to XXXXXXXX