Unlocking the disk (sda5_crypt) Enter Passphrase

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http://askubuntu.com – I had installed ubuntu 12.10 with security key for enscrypting system hard disk which requires you to enter the passphrase before the login screen every time you boot your system... i wanted to get rid of that security key so i used a command in terminal while my system was working fine but somehow the command disabled the logon to my system (even after using the correct PW same is not opening ... i wanted ti reinstalll ubuntu through bootable USB but i think the security key for encrypting the hard disk is preventing the same ... i am just left with a useless laptop with me where i cant ev (HowTos)