How To Use John The Ripper To Crack Dmg File
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In this post I will show you how you can crack passwords with John the Ripper. We will start off by collecting the hashes from a linux machine, then use the tool unshadow and at last crack the hashes with John the Ripper.
John the Ripper (also called simply ‘John’ ) is the most well known free password cracking tool that owes its success to its user-friendly command-line interface. John has autodetect capability. Crack Password Using JohnTheRipper Tool. Firstly, we are going to install John the ripper tool in your Kali by typing sudo apt-get install john in your terminal and if you are using another platform like windows then you can download it via clicking here. After installing it just type john and then this tool will open like this.
1 – Collect hashes from a Linux machine
We will start with collecting the hashes from the target machine. We will need both /etc/passwd and /etc/shadow. Save them to your Kali Linux machine, preferably on the desktop. It can be done with the following commands.cat /etc/passwd > ~/Desktop/passwd.txt
cat /etc/shadow> ~/Desktop/shadow.txt
2 – Combine passwd and shadow with unshadow
Now we need to combine these two files into one. This can be done with the tool unshadow. unshadow passwd.txt shadow.txt > hashtocrack.txt
3 – Crack with John
Now we are ready to crack the hashes. John can run in different modes. You can use wordlists or straight brute force. The method I will use in this example is wordlist mode since that is the most effective way. Brute forcing takes a lot of time and I recommend you to only use it as a last resort when your wordlists won’t crack the hashes. In this example we define the wordlist to use to the built in rockyou.txt.john --wordlist=/usr/share/wordlists/rockyou.txt hashtocrack.txtSoftware untuk hack game.
4 – Show cracked credentials
If you let john run you will be prompted with the credentials as soon as they have been cracked. In this example we can see that the the password for the user SuperAdmin was Password1.
We can also come back at a later time and check the credentials again by defining the unshadowed file and add the parameter –show.
john hashtocrack.txt --show
//Rickard
John is able to crack WPA-PSK and WPA2-PSK passwords. Recent changes have improved performance when there are multiple hashes in the input file, that have the same SSID (the routers 'name' string).
The input format is a printable hash, which can either be directly created with john's tool “wpapcap2john” (ships with jumbo) from a packet capture in pcap format as produced by tcpdump, wireshark or airodump-ng; or by doing an intermediate conversion to Hashcat's hccap format as described below.
You can convert airodump's .cap file to .hccap in one of the following ways:
When you have hccap file you need to convert it to john's input format using “hccap2john” program shipped with recent jumbo versions.It encodes hccap file to “$WPAPSK$essid#b64encoded hccap”
Example testcase you can get from http://wiki.wireshark.org/SampleCaptures?action=AttachFile&do=view&target=wpa-Induction.pcap or wpa-Induction.tar.gz
From that point you can use john as you always do. The format comes in two flavours:
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- -format=wpapsk (will use CPUs, is SIMD and OpenMP capable)
- -format=wpapsk-opencl (for any OpenCL GPU or CPUs)
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Example usage:
How To Use John The Ripper To Crack Dmg Files
- $ ./john -w=password.lst -form=wpapsk-opencl crackme
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If “Induction” is in your (by default it is not) password.lst file, john will crack it.
If you are interested in how it works visit this page