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How do I use John the ripper to check weak passwords / crack passwords?

April 26, 2017crack John passwords ripper weak

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How do I use John the ripper to check weak passwords / crack passwords?

2 Answers

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First use the unshadow command to combines the /etc/passwd and /etc/shadow files so John can use them. You might need this since if you only used your shadow file, the GECOS information wouldn’t be used by the “single crack” mode, and also you wouldn’t be able to use the -shells option. On a normal system you’ll need to run unshadow as root to be able to read the shadow file. So login as root or use old good sudo / su command under Debian / Ubuntu Linux: $ sudo /usr/sbin/unshadow /etc/passwd /etc/shadow > /tmp/crack.password.db RHEL / CentOS / Fedora Linux user type the following command: # /usr/bin/unshadow /etc/passwd /etc/shadow > /tmp/crack.password.

0

Posted

First use the unshadow command to combines the /etc/passwd and /etc/shadow files so John can use them. You might need this since if you only used your shadow file, the GECOS information wouldn’t be used by the “single crack” mode, and also you wouldn’t be able to use the -shells option. On a normal system you’ll need to run unshadow as root to be able to read the shadow file.