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We will now use http:// to crack the above hashes. The images below show the password cracking results for the above passwords. John the Ripper is a free password cracking software tool. Initially developed for the Unix operating system, it now runs on fifteen different platforms (eleven of. Audacity Portable works best with the PortableApps.com Platform.

How to Crack a Password What is Password Cracking? Password cracking is the process of attempting to gain Unauthorized access to restricted systems using common passwords or algorithms that guess passwords. In other words, it’s an art of obtaining the correct password that gives access to a system protected by an authentication method. Password cracking employs a number of techniques to achieve its goals. The cracking process can involve either comparing stored passwords against word list or use algorithms to generate passwords that match In this Tutorial, we will introduce you to the common password cracking techniques and the countermeasures you can implement to protect systems against such attacks.

The strength of a password is determined by; Length: the number of characters the password contains. Complexity: does it use a combination of letters, numbers, and symbol? Unpredictability: is it something that can be guessed easily by an attacker? Let’s now look at a practical example.

We will use three passwords namely 1. The images below show the password strengths of each of the above- listed passwords. Note: the password used is password the strength is 1, and it’s very weak. Note: the password used is password. Note: The password used is #password. We will use an online md.

The images below show the password cracking results for the above passwords. We didn’t manage to crack the third password which was longer, complex and unpredictable. It had a higher strength number. Password cracking techniques There are a number of techniques that can be used to crack passwords. We will describe the most commonly used ones below; Dictionary attack– This method involves the use of a wordlist to compare against user passwords. Brute force attack– This method is similar to the dictionary attack. Brute force attacks use algorithms that combine alpha- numeric characters and symbols to come up with passwords for the attack.

For example, a password of the value “password” can also be tried as p@$$word using the brute force attack. Rainbow table attack– This method uses pre- computed hashes. Let’s assume that we have a database which stores passwords as md. We can create another database that has md.

We can then compare the password hash we have against the stored hashes in the database. If a match is found, then we have the password. Guess– As the name suggests, this method involves guessing. Passwords such as qwerty, password, admin, etc.

If they have not been changed or if the user is careless when selecting passwords, then they can be easily compromised. Spidering– Most organizations use passwords that contain company information.

This information can be found on company websites, social media such as facebook, twitter, etc. Spidering gathers information from these sources to come up with word lists. The word list is then used to perform dictionary and brute force attacks. Spidering sample dictionary attack wordlist. Crack For Download Accelerator Plus Dap For Firefox.

We already looked at a similar tool in the above example on password strengths. The website www. md. We will now look at some of the commonly used tools John the Ripper John the Ripper uses the command prompt to crack passwords. This makes it suitable for advanced users who are comfortable working with commands. It uses to wordlist to crack passwords. The program is free, but the word list has to be bought. It has free alternative word lists that you can use.

Visit the product website http: //www. Cain & Abel Cain & Abel runs on windows. It is used to recover passwords for user accounts, recovery of Microsoft Access passwords; networking sniffing, etc. Unlike John the Ripper, Cain & Abel uses a graphic user interface. It is very common among newbies and script kiddies because of its simplicity of use. Visit the product website http: //www.

Security/Decrypting- Decoding/Cain- and- Abel. Ophcrack Ophcrack is a cross- platform Windows password cracker that uses rainbow tables to crack passwords. It runs on Windows, Linux and Mac OS.

It also has a module for brute force attacks among other features. Visit the product website http: //ophcrack. Sda Quarterly Teacher S Edition here. Password Cracking Counter Measures An organization can use the following methods to reduce the chances of the passwords been cracked Avoid short and easily predicable passwords Avoid using passwords with predictable patterns such as 1. Passwords stored in the database must always be encrypted. For md. 5 encryptions, its better to salt the password hashes before storing them. Salting involves adding some word to the provided password before creating the hash.

Most registration systems have password strength indicators, organizations must adopt policies that favor high password strength numbers. Hacking Activity: Hack Now! In this practical scenario, we are going to crack Windows account with a simple password. Windows uses NTLM hashes to encrypt passwords. We will use the NTLM cracker tool in Cain and Abel to do that.

You will need to download the dictionary attack wordlist here 1. Most- Common. zip For this demonstration, we have created an account called Accounts with the password qwerty on Windows 7. The following dialog window will appear The local user accounts will be displayed as follows. Note the results shown will be of the user accounts on your local machine. Right click on the account you want to crack.

For this tutorial, we will use Accounts as the user account. The following screen will appear Right click on the dictionary section and select Add to list menu as shown above Browse to the 1. Click on start button If the user used a simple password like qwerty, then you should be able to get the following results. Note: the time taken to crack the password depends on the password strength, complexity and processing power of your machine. If the password is not cracked using a dictionary attack, you can try brute force or cryptanalysis attacks. Summary Password cracking is the art of recovering stored or transmitted passwords.

Password strength is determined by the length, complexity, and unpredictability of a password value. Common password techniques include dictionary attacks, brute force, rainbow tables, spidering and cracking. Password cracking tools simplify the process of cracking passwords.