README for Password Cracking RepositoryBy: Trevor KroegerPython 2.7.5.USE THESE FILES RESPONSIBLY. CRACKING PASSWORDS IS ILLEGAL AND USE OF THESEFILES/PROGRAMS IS NOT INTENDED.This is my first substantial exercise in python programming.Description:This is a password cracking exercise preformed for a course InformationSecurity & Privacy.

I had a very big surprise with this dump because when I started to work on it, I quickly noticed that all password were uppercased Thanks eHarmony! Just to remember, the number of combinations for a N characters length password made of a charset of C different letters is C^N. Cara menginstal windows 7. Passwords are hidden by default to protect your security and privacy. If you need to see the list of your credentials, you may go to Control Panel User Accounts Credential Manager. You may click the dropdown arrow then click Show on Password field.

The idea is to use a dictionary attack against the leakedpassword files to determine what password was used. The leaked lists areprovided without the username association.Process Used for Determining Plaintext:For the plain text within the yahoo.txt I extracted it from the file using apython program to get it into the format needed for submission for theassignment.I did consider a brute force tactic for decoding passwords with less than 6characters and did implement such a program to learn some python programminghowever I did realize how inefficient this process was and abandoned theprocess very quickly.To determine the plain text of the two hashed lists I decided to perform adictionary attack. I downloaded the rockyou.txt list of passwords to performthis method. I take thehashed passwords from the.txt files and load them into a set. Then I computethe hashes of each of the lines of the lines in my word list and see if theyare in the set of hashed passwords. Also when decoding eharmony file I foundhelp with it online.This site did a pipal analysis of the passwords which told me that all of thepasswords were uppercase and some fun facts about different things amongst thepassword set such as the percentage that was stringdigit, digitstring, or allstring. This proved to be crucial for decoding the passwords as none of mydictionary words were in uppercase.

It’s another thing to keep in mind if I amtrying to crack other passwords.For the formspring passwords I preformed the same type of process however I hadto add code to perform the salting before each of the passwords. I appendedvalues from 00 to 99 to the beginning of the plaintext password and followedthe same process that I used for the eharmony passwords. Salting definitelymade this password list harder for me to determine and it has taken a lot moretime to determine more of the passwords from the list. If we hadn’t been giventhe information about the salt I’m not sure I would’ve guessed it on my own andI would’ve maybe got a few passwords on my own but nowhere near the amount thatI did get when given that information. Salting seems to be very beneficial if itcan be done appropriately. I should note that I didn’t include the Salt valuesin my print out, which I realize I should have otherwise you cannot get to thepassword readily. You have to rehash and look for the correct salt.

I wasfollowing the format for submission with a space separating the encodedpassword, the plaintext password and the file from which the password was from.Next Steps:If I were to continue the exercise to determine even more of the plaintextpasswords I think that my first step would be to expand my dictionary of words.There were several other lists online that could’ve been added to my list. Ialso could have started to combine words in the list to create new patternsto check against. I could’ve also started to preform alpha numeric or symbolicreplacement (i.e. Replacing the letter L with 1 or replacing S with $).

Alsoadding a numerical value to the beginning or end of the passwords would’vebeen helpful due to the fact that the pipal analysis of the eharmonypasswords showed that a majority of them are digit-string or string-digitpasswords. If I was to continue to crack passwords on a large level I couldcreate a comprehensive rainbow table for the hashes. I could compute millionsof hashes and keep the result to check against later.

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The advantage associatedwith this that you no longer have to compute the hashes you just have to lookat the provided hash and determine if it is in memory.The following are the files needed to crack each of the different password files:YAHOO: Plaintext Passwordsyahoo.txt.