How to crack weak passwords using “john-the-ripper”
STEP #1 – Install “John-the-ripper” from the link given below and install using rpm
STEP #2 – Use “unshadow” command to combine /etc/passwd and /etc/shadow files, so that john-the-ripper can use it.
/usr/bin/unshadow /etc/passwd /etc/shadow > /tmp/myfile.db
this command combines /etc/passwd and /etc/shadow file to be used.
STEP #3 – Use “john-the-ripper” to see the cracked passwords.
john -show /tmp/myfile.db
…shows user u1 has a password of abc123 and u2 has a password of didi123