Home » Dictionary attacks | Computer Science homework help

Dictionary attacks | Computer Science homework help


  1. Write a Python script to perform a dictionary attack on a Linux password file.
    1. Copy /etc/shadow file to your local directory. Study the format of this file.
    2. Add the following 3 lines to the /etc/shadow file. For speed purposes remove all other lines.




  1. Use the “crypt” library crypt function to create your hash.
  2. Use the “hmac” library compare_hash function to compare hashes from the /etc/shadow file to the hashes produced from your guesses.
  3. Use the string split() function to separate the separate the password lines from the shadow file by the ‘:’ delimiter to isolate the userid and the hash from an entry in the shadow file.
  4. Calculate the appropriate hash (using the method specified for the entry from the shadow file) for each word in this wordlist (http://www.openwall.com/passwords/wordlists/password-2011.lst (Links to an external site.)), compare the hash, and stop comparing when you find a match.
  5. Attempt the dictionary attack for each entry in the shadow file.
  6. Remember you need to provide the word from the dictionary, the method, and the salt to the crypt() function.
  7. Print the userid and password when a match is found:
    “Match found for userid [userid]. Password = [password]”
  8. Print the “No match was found for [userid]” when there no match in the dictionary.

UPDATE: Your program should run with the following command line:

>> python3 dictionary.py [shadow filename] [dictionary filename]

Calculate the price of your order

550 words
We'll send you the first draft for approval by September 11, 2018 at 10:52 AM
Total price:
The price is based on these factors:
Academic level
Number of pages
Basic features
  • Free title page and bibliography
  • Unlimited revisions
  • Plagiarism-free guarantee
  • Money-back guarantee
  • 24/7 support
On-demand options
  • Writer’s samples
  • Part-by-part delivery
  • Overnight delivery
  • Copies of used sources
  • Expert Proofreading
Paper format
  • 275 words per page
  • 12 pt Arial/Times New Roman
  • Double line spacing
  • Any citation style (APA, MLA, Chicago/Turabian, Harvard)

Our guarantees

Delivering a high-quality product at a reasonable price is not enough anymore.
That’s why we have developed 5 beneficial guarantees that will make your experience with our service enjoyable, easy, and safe.

Money-back guarantee

You have to be 100% sure of the quality of your product to give a money-back guarantee. This describes us perfectly. Make sure that this guarantee is totally transparent.

Read more

Zero-plagiarism guarantee

Each paper is composed from scratch, according to your instructions. It is then checked by our plagiarism-detection software. There is no gap where plagiarism could squeeze in.

Read more

Free-revision policy

Thanks to our free revisions, there is no way for you to be unsatisfied. We will work on your paper until you are completely happy with the result.

Read more

Privacy policy

Your email is safe, as we store it according to international data protection rules. Your bank details are secure, as we use only reliable payment systems.

Read more

Fair-cooperation guarantee

By sending us your money, you buy the service we provide. Check out our terms and conditions if you prefer business talks to be laid out in official language.

Read more