Privilege Escalation (2)

In my previous post I promised to discuss how to cracking passwords with john the ripper. before entering the phase of cracking, I will introduce what it is john the ripper.
John the Ripper is a fast password cracker. There are some important things to JTR 

[Passfile] - The name of the password file you
[Wordlist] - Collection of the words
[Output] - Results decrypt passwords

- Password File example: password.txt -
vmware: $ 1 $ 7nwi9F / D $ AkdCcO2UfsCOM0IC8BYBb /: 14042:0:99999:7::: 
Obama: $ 1 $ hvDHcCfx $ pj78hUduionhij9q9JrtA0: 14041:0:99999:7::: 
osama: $ 1 $ Kqiv9qBp $ eJg2uGCrOHoXGq0h5ehwe.: 14041:0:99999:7:::
yomama: $ 1 $ tI4FJ.kP $ wgDmweY9SAzJZYqW76oDA.: 14041:0:99999:7:::


There are 3 modes in the JTR to decrypt the password 

1. Single Mode
In Single Mode, JTR will try to find password quickly.
command:
john-the passwd.txt

2. Wordfile Mode

This is the fastest way to second but the JTR requires dictionary words

command: 
john-w: words.lst password.txt
 
3. Incremental Mode

In this way the slowest because it takes many days to download decrypt all passwords

command 
john-i passwd.txt 
john-i: digits passwd.txt
john-i: ALPHA passwd.txt 
john-i: ALL passwd.txt

to see the results we type the command
command: 
john-show password.txt> hasil.txt
 
You can also see directly from JTR decrypt the results by typing the command 
john-show [passfile]
 
All passwords are never stored in the crack in john.pot JTR  

Immediately, in the discussion, the previous post we have been copying etc / shadow into a txt file with the name of the password. we will try cracking with thhe john ripper, simply go to JTRtype the command 
john-i ~ / passwd.txt

wait until the process is complete:)