Crack Unix Password Online

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John is one of the top 10 security tools in Kali Linux. On Ubuntu, it can be installed through the Synaptic Package Manager. In this article, I will show you how to use the unshadow command together with John to crack a user’s password on a Linux system. On Linux, the user name / key details are stored in the following two files. It basically performs dictionary attacks against a wireless network to guess the password. As you already know, the success of the attack depends on the dictionary of passwords. The better and more effective the password dictionary is, the more likely it is that it will crack the password. It is available for Windows and Linux platforms. Both unshadow and john commands are distributed with “John the Ripper security” software. It act as a fast password cracker software. It is a free and Open Source software. It runs on Windows, UNIX and Linux operating system. Open THC-Hydra ​ So, let's get started. Fire up Kali and open THC-Hydra from Applications - Kali.

In this chapter, we will learn about the important password cracking tools used in Kali Linux.



Hydra is a login cracker that supports many protocols to attack ( Cisco AAA, Cisco auth, Cisco enable, CVS, FTP, HTTP(S)-FORM-GET, HTTP(S)-FORM-POST, HTTP(S)-GET, HTTP(S)-HEAD, HTTP-Proxy, ICQ, IMAP, IRC, LDAP, MS-SQL, MySQL, NNTP, Oracle Listener, Oracle SID, PC-Anywhere, PC-NFS, POP3, PostgreSQL, RDP, Rexec, Rlogin, Rsh, SIP, SMB(NT), SMTP, SMTP Enum, SNMP v1+v2+v3, SOCKS5, SSH (v1 and v2), SSHKEY, Subversion, Teamspeak (TS2), Telnet, VMware-Auth, VNC and XMPP).

To open it, go to Applications → Password Attacks → Online Attacks → hydra.

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It will open the terminal console, as shown in the following screenshot.

In this case, we will brute force FTP service of metasploitable machine, which has IP

We have created in Kali a word list with extension ‘lst’ in the path usrsharewordlistmetasploit.

The command will be as follows −

where –V is the username and password while trying

As shown in the following screenshot, the username and password are found which are msfadmin:msfadmin


Johnny is a GUI for the John the Ripper password cracking tool. Generally, it is used for weak passwords.

To open it, go to Applications → Password Attacks → johnny.

In this case, we will get the password of Kali machine with the following command and a file will be created on the desktop.

Click “Open Passwd File” → OK and all the files will be shown as in the following screenshot.

Click “Start Attack”.

After the attack is complete, click the left panel at “Passwords” and the password will be unshaded.


john is a command line version of Johnny GUI. To start it, open the Terminal and type “john”.

In case of unshadowing the password, we need to write the following command −


The RainbowCrack software cracks hashes by rainbow table lookup. Rainbow tables are ordinary files stored on the hard disk. Generally, Rainbow tables are bought online or can be compiled with different tools.

To open it, go to Applications → Password Attacks → click “rainbowcrack”.

The command to crack a hash password is −


It is a dictionary attack tool for SQL server and is very easy and basic to be used. To open it, open the terminal and type “sqldict”. It will open the following view.

Under “Target IP Server”, enter the IP of the server holding the SQL. Under “Target Account”, enter the username. Then load the file with the password and click “start” until it finishes.

Crack Unix Password Online Hacker


Crack Unix Password Online Hack

It is a tool that is used to identify types of hashes, meaning what they are being used for. For example, if I have a HASH, it can tell me if it is a Linux or windows HASH.

How To Reset Unix Password

The above screen shows that it can be a MD5 hash and it seems a Domain cached credential.