How to crack passwords in Ubuntu
I was wondering how to crack Ubuntu passwords in Ubuntu 10.04. I was reading "Red Hat Linux: Administrator's Handbook" by Mohammed J. Kabir and I was looking at the section on cracking passwords. The reason I am interested in cracking passwords is NOT for creating viruses and malware. I am currently setting up a system of four or five Ubuntu computers to work together. I am basically going through and trying to expose security holes and fix them. The book I read said to look in </etc/passwd> directory. However I find that when I do <cd /etc> and then do <ls>, I find that <passwd> and <passwd-> are files. The book then tells me to (after I downloaded "crack-md5") to do <Crack /etc/passwd>. But it just comes up with an error message. Does anyone else know of password cracking or hacking techniques that will give me a password or give me access to the root user? If so please tell me, because I would prefer to find the holes myself instead of another malicious hacker. I have also heard that Ubuntu uses the Linux code entirely, but now I am wondering if it isn't a modified Linux system.
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