A collection of CTF resources in ever growing shape (Python and C++ only). May not be fully optimized...bear with me.

The tools folder contains the following subroutines:

• ExtendedEuclid solves any linear 2-variable diophantine equation.
• CRT solves any system of modular equations by means of the CRT theorem.
• MillerRabin is a stochastic test for primality.
• FrequencyAnalyzer analyzes character frequency of a string.

The crypto folder contains the following ciphers:

• CaesarCipher implements a shift cipher for any alphabet.
  • Contains a simple bruteforce attack.
• VigenereCipher implements a shift cipher with multiple keys.
  • Contains setup for the Kariski attack.
• XOR implements a XOR cipher.
• MonoalphabeticCipher implements a permutation cipher.
  • Contains interface for attacks via frequency analysis and the Hart attack.
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The test folder contains some examples of driver code for using this library. Run the examples as follows:

python3 -m thectfden.test.filename

from outside the project.