teej1_comp30023_2019_project-2

Score and comments

    3.0 out of 3 for correctly implementing the two-argument form of crack
    1.9 out of 2 for "good" guesses
    1.0 out of 1 for code quality
    0.5 out of 1 for build quality
    3.0 out of 3 for passing the Diffie-Hellman challenge response
    5.0 out of 5 for discovering passwords
    
Marker comments:
    Good readability and modularisation, Well commented code, Consistent indentation

1. Statistics for smart guess generation based on common_password.txt and classes hashed passwords:

Statistics are calculated using Stats_common_password.ipynb (python jupyter notebook)

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General overview of the distribution of words

• 82 % are alphabets
• 11 % are alphanumeric
• 5 % are numbers

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Character distribution of passwords

• Passwords comprises of 70 different character
• 99% of passwords dont contain special characters
• 85% of passwords contain either 0 or 1 numbers
• 99% of passwords do not contain uppercase

Interesting distribution

• only 2% of words contain consecutive character
• numbers character probability sorted in descending order - 1,2,0,9,3,4,5,6,7,8
• 99% of passwords do not contain uppercase
• In most cases, uppercase are in the first few characters

Flow of the program for 1 argument (Generate passwords)

1. Try dictionary attack, spit out words from common_passwords.txt

   • 3 cases:
     • word length = 6 (nice, just print out)
     • word length > 6 (slice word so word length = 6 and print)
     • word length < 6 (digit padding, based on distribution of numbers)

2. Smart generation of password will be based on:

   • 6 character, split into alphabets (82%), alphanumeric(11%) and numeric passwords (5%)
   • How it works:
     • statisics of each character for each index is calculated
     • based on the statistics, it is randomly generated.

To run this program,

1. run "make clean" - to remove all binary files and executables
2. run "make" - to create executable files
3. run "./crack NUMBEROFGUESSTOGENERATE" OR "./crack GUESSFILE HASHFILE"