RAINBOW TABLES For a number of years, Password Crackers, Inc. Hosted an approximately 9tb collection of rainbow table files as torrents and we also hosted multiple. WonderHowTo Null Byte. That we are going to be using to generate and use rainbow tables. On each of the files in the directory ending in *.rt.

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Table of Contents. One of the most common ways of cracking the password is guessing. Most of the hackers gain access by taking advantage of vulnerable passwords. Another way of cracking password is using brute force attacks. These days even the difficult passwords can be broken using some tools. Traditional brute force attacks are time consuming. Rainbow table is more advanced and faster technique than traditional brute force attacks.

The concept of rainbow table was given Philippe Oechslin using time-memory trade-off theory. RainbowCrack was developed with the rainbow table concept which uses a time and memory based algorithms. In this paper I will discuss on RainbowCrack, Rainbow table, password hashes and rainbow table generation technique. RainbowCrack RainbowCrack is a hash cracker tool which uses a time and memory based algorithm.

This tool is different from a brute force hash cracker, in the sense that it does not have to compile all the required plaintexts, while storing equivalent hashes, in order to compare the compiled hashes with the one that has been slated for cracking. The brute force method compares hashes, and when a connection is made, the plaintext is determined. This method does away with all transitional documented results during the process.

RainbowCrack can be installed in several Linux distributions. In Kali Linux, RainbowCrack tool is built in. To find all the commands of RainbowCrack enter -. rcrack –h.

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Figure 1 - Rainbow Crack in Kali Rainbow Table RainbowCrack cracks hashes by rainbow table lookup. The time-memory hash cracker on the other hand, has a pre-documentation process, which couples all plaintext with respect to the environment of a specific hash algorithm. The process is documented and any solution gotten is stored in records called rainbow table. This method takes up a lot of time, but only during the pre-documentation stage. After the initial stage, performance is increased exponentially to crack hashes better than the brute force method. One disadvantage of the rainbow table is its affinity to copious amounts of space on the computer’s storage. While rainbow tables are better than the brute force method, they can be trumped by salted hashes which could mean a lot of time being put into cracking the hash with no results.

Password hash Passwords that have been created are not hashed yet, and as such they are tagged as plain text. Upon storage, these passwords are stored as a one-way hash by the computer it protects. These passwords cannot be reversed, this is why they are stored as a one-way hash, and this means they have to be cracked. For the process of cracking a hash, the computer documents a word, after which the hash is created. These two parameters are compared, to determine if they are the same.

A match would mean the password has been cracked; otherwise the system keeps up with the algorithm until a match is found. The rainbow table method means that these plaintexts are created by the system and stored in this space for an easier comparism scheme. The rainbow table is necessary for organizations or individuals with slow processors, as it takes away the need for speedy processing. RainbowCrack is beneficial as it cuts down time taken to crack the passwords, as well as stores hashes in a table which could be used in future.

In order to crack a hash, the computer being used has to have the root access and a Linux/Windows/Mac OS. Usage of RainbowCrack In this section some of the RainbowCrack commands are discussed. Note that RainbowCrack runs on both Windows and Linux machine. If you want to run it in Windows download the Windows Version directly from Moreover you can find both command-line and GUI mode of RainbowCrack.

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Creating rainbow table and cracking password hashes in Kali using RainbowCrack0 Firstly, it is important that users open a command prompt. Secondly, users should first go to the RainbowCrack active path. So type cd /usr/share/rainbowcrack to change the directory – Figure 2- Changing Directory You can also check the directory using ls command to find all the tools of RainbowCrack – Figure 3 - All the RainbowCrack tools. rt2rtc – Convert rainbow tables from.rt to.rtc. rtc2rt – Convert rainbow tables from.rtc to.rt. rtgen – Generate rainbow tables.

rtsort – Sort rainbow tables. rcrack – Rainbow table password cracker Next step is to create the table. The syntax is – rtgen hashalgorithm charset plaintextlengthmin plaintextlengthmax tableindex chainlen chainnum partindex The table to be created will comprise of numbers and lowercase alphabets. In addition the MD5 algorithm will be used, while keeping the passwords to be created within four to six characters. In the active path, put the command below to create the rainbow table - rtgen md5 loweralpha-numeric 1 5 0 25 0 Figure 4 - Generating Rainbow Table The generation procedure takes long time. It can take 3 to 5 hours to finish. If you want a faster rainbow table generation then you must have a faster machine.

You can also download Rainbow Tables from online. When the table is generated, it can be used on a word in order to find a match. The results will be given after some time. It is important to understand that the bruteforce process for this same hash would give a faster result.

Now let’s say you want to crack a password “cat”. First hash the word “cat” with the MD5 algorithm (google it for 100s of free online Md5 hash generators). I hashed and found - d077f244def8a70e5ea758bd8352fcd8. Now check the generated rainbow tables to crack it.

Crack the hash with the following command, along with the path to your file. Rcrack -h d077f244def8a70e5ea758bd8352fcd8 You will be able to crack it if your Rainbow Table is generated accurately. Note that the faster your machine, the easier it is to crack any password using rainbow table. Rainbow table file sizes can be 1 GB to 450 GB or more. The size depends on how you are generating the rainbow tables. RainbowCrack is lot faster than traditional brute force attacks. Published with the express permission of the author.