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https://github.com/jacobpclouse/526-hw-1-cipher

My own cryptographic cipher based off of the 1st homework issued - 526 Cryptography - Spring 2023
https://github.com/jacobpclouse/526-hw-1-cipher

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My own cryptographic cipher based off of the 1st homework issued - 526 Cryptography - Spring 2023

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# 526-HW-1-Cipher

> My own cryptographic cipher based off of the 1st homework issued - 526 Cryptography - Spring 2023 

> Video walkthrough of this code: https://youtu.be/ZLbgEE1HJHE



## Objectives for this Homework:

Design and implement your own (new) encryption scheme that uses the three operations widely used in classical cryptography: *Substitution*, *Transposition* and *Product*. 



Provide a description of your algorithm and justify the choice of steps and operations used in the algorithm. 

[3+2 = 5 points]



In addition, show that:

- * (a) breaking your algorithm is going to require coding effort (i.e., your algorithm cannot be broken by using pen and paper). [1.5 points]



- * (b) your algorithm is secure against any two cryptanalytic attacks. [1.5 points]



## My Idea:

I want to create something unique that uses random/psuedo random input to 'salt' the password in a way that is very hard to break. I'm thinking of writing one substitution cipher, then a transposition cipher and then trying to combine the two into a final cipher (and add in some extras to spice it up).

- [x] I want these written in: ![Python](https://img.shields.io/badge/Python-14354C?style=for-the-badge&logo=python&logoColor=white)

- [x] Substitution cipher draft has been finished

- [x] Transposition cipher draft has been finished

- [x] Combine both programs into the final program

- [x] Make it uncrackable: Add a random salt to the cipher that prevents freqency analysis (and doesn't make decryption impossibles) - added One Time Pad

- [x] Create video to display how the program works



## Resources used:

- Basic writing and formatting syntax Github Markdown: https://docs.github.com/en/get-started/writing-on-github/getting-started-with-writing-and-formatting-on-github/basic-writing-and-formatting-syntax

- Difference between Substitution Cipher Technique and Transposition Cipher Technique: https://www.geeksforgeeks.org/difference-between-substitution-cipher-technique-and-transposition-cipher-technique/

- Encyclopaedia Britannica Definitions: 

- * Substitution cipher: https://www.britannica.com/topic/substitution-cipher

- * Transposition cipher: https://www.britannica.com/topic/transposition-cipher

- * Product cipher: https://www.britannica.com/topic/product-cipher

- Python List append(): https://www.programiz.com/python-programming/methods/list/append

- Python String lower() Method: https://www.geeksforgeeks.org/python-string-lower/

- Python | Check if a variable is string: https://www.geeksforgeeks.org/python-check-if-a-variable-is-string/

- How to Write String to Text File in Python?: https://pythonexamples.org/python-write-string-to-text-file/

- Python For loop get index: https://stackoverflow.com/questions/15684605/python-for-loop-get-index

- How to test that variable is not equal to multiple things?: https://stackoverflow.com/questions/12553609/how-to-test-that-variable-is-not-equal-to-multiple-things

- How to Convert List to String in Python?: https://www.simplilearn.com/tutorials/python-tutorial/list-to-string-in-python#:~:text=To%20convert%20a%20list%20to%20a%20string%2C%20use%20Python%20List,and%20return%20it%20as%20output.

- Generating random number list in Python: https://www.tutorialspoint.com/generating-random-number-list-in-python

- Python ord() Function: https://www.w3schools.com/python/ref_func_ord.asp

- Cryptanalysis and Types of Attacks: https://www.geeksforgeeks.org/cryptanalysis-and-types-of-attacks/