Don't you hate when you are playing in a minecraft server, and someone griefs your house. Then they say" It was my sister/brother." That is just annoying cause they just take it out on their brother/sister. Usually they are wrong, and they actually did do it, no matter what they say. I found a plugin that can be good/bad for servers, It is called Crazy Login. If you are running an offline server, you can protect your server using this plugin against account thiefs/griefers. Any-how check out the plugin here: http://dev.bukkit.org/server-mods/crazylogin/

I DID NOT MAKE THE PLUGIN.TheOneMadHawk DID.

Features

• Maybe-Password:
  

The user can create a password, if he/she wants to (for everybody with special server rights).

• Password-Only:
  

The user has to create a password and login.