Password cracking

Hello,
I got this little problem that I just forgot my password to the keychain and I really need to access the data that is stored in there and I need some help to find a program that can with brute force crack my password.

I know the password is 16 charters long and I also are sure of the 2 first charters so a program that only attack 16 charters long password is needed and if it can use multi-cores it would be even greater.

I really hope someone can help me. Thanks in advance.

Sorry. Nobody here will be able to help with that. You can use your machine's install disks to reset your admin password, though.

Discussion about "cracking" anything is not permitted on these forums.

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