i recently took a class where they refer to CRACK at http://www.crypticide.org/users/alecm but that page doesnt exists anymore. so i thought that since if i am looking for this package i would find a location where i can download it. my co-worker email it to me so i will attached it to this post so you can also download it for our class

or

you can download from this link:

ftp://ftp.cerias.purdue.edu/pub/tools/unix/pwdutils/crack/

crack5.0.tar.gz