This repository contains assignment submissions made in the course CS641 (2022-23 II Sem.) at IIT-K in a team (Team Name: cap_turing) of three (Priya "priyagole" Gole, Shrilakshmi "shrilakshmisk" S K and me, Aditya "cliche-niche" Tanwar).

Notes

The notes that I made for this course can be found here. I would like to acknowledge Prof. Manindra Agrawal for these notes since I could make them only with the help of his lectures and lecture slides.

Assignments

The solutions (only the commands used) for each assignment have been provided in Solutions.
The assignments were in the form of (CTF) "games" in which we were supposed to figure out passwords using different cryptanalytic techniques and the hints provided. A brief overview of each assignment has been given below:

• Assignment 1: Substitution ciphers
  Awarded 43/50

  • -2 for not mentioning Monoalphabetic
  • -5 for not mapping punctuation marks to themselves

• Assignment 2: Vigenere cipher
  Awarded 65/65

• Assignment 3: Substitution Permutation Network
  Awarded 48/50

  • -2 for not mentioning block length

• Assignment 4: 6-round DES
  Awarded 95/100

  • -5 for not mentioning number of pairs required
    

  Remark: Code is not complete since the team could not break this assignment.

• Assignment 5: AES variant
  Awarded 100/100

There were supposed to be 6 regular assignments (last assignment on small e case of RSA), and a bonus assignment (on some miscellaneous topic), but as the last assignment did not work properly on the game server, it was scrapped along with the bonus assignment.