py-basic/Tasks.md

Tasks for beginners

This document contains some tasks for Python beginners. It does not aim to teach general programming techniques, only how to use Python.

MD5 Hashchecker

• Hash foobar19 with the md5 hashing algorithm
  • Hints:
    • Use Pythons hashlib.
    • Your hashing function does not take strings for input, only raw data (bytes).
    • You need to explicitly tell your hash to actually process the input.
    • When printing your results, the result may be interpreted as data for characters. You want the numeric value of the result in Hexadecimal.
    Solution

    MD5 of `foobar19` is `fa5c65d5438f849387d3fdda2be4dd65`
• 1. rotate the base string foobar with numbers from 0 to 999999 like this: 1. foobar000000 2. foobar000001 3. foobar000002 ... 999999. foobar999999 2. Get the MD5 hash value for each of those 3. How many of these start with 00?
  • Hints:
    • Use a for loop to do the thing X times
    • Use Pythons string formatting to put the numbers and string together
    • Use Options for the %d Placeholder to get 0 to be displayed as 000000
    • do the same hashing as in the previous task
    • After hashing, check if your current hash matches the search. Print it if that is the case to see if the match is a false positive.
    • Increment a number on each match. The value of that number after the loop is how many Hashes start with 00 for this task.
  • Testvectors, the last 5 matches:

    999384 | 009671fd23fa783df1fff63516e5d115
    999751 | 00ec2ade58f75c44b7300294497f7fb1
    999844 | 009cfd7949b577a3311d9db3ee49c15d
    999852 | 006fe04f7d3f710f93d3e6324506154a
    999902 | 00c063364ddffa1bdf338dfcf0319424
    

    Solution

    3889 matches for the search parameters.
• Continuing from the previous task, what is the earliest value for foobarXXXXXX (where X is a substitute for the iterating numbers) where the hash starts with 0000? - Hints: - Stop on the earliest match.
  Solution

  021820 | 00001c9393b83c8da0db478687211d1d

Super basic webserver

• Make a webserver print "Schlangenjazz" when you connect to it