I know when i first installed dolphin not that long ago my site had gotten hacked, they defaced it through some known dolphin security flaw. I had searched this and had installed this in my directory so they cant access my admin panel even if they were to hack my site again..
http://www.boonexnerd.net/dolphin/viewPage.php?ID=Dolphin%20Security%20Roundup%20-%20Has%20Your%20Site%20Been%20Hacked
http://www.boonexnerd.net/dolphin/viewPage.php?ID=Dolphin%20Security%20Roundup%20-%20Has%20Your%20Site%20Been%20Hacked
http://www.boonex.com/unity/blog/entry/Mscott_s_mindless_security_tips