CE708 Computer Security Summer Reassessment 2024-25 | UoE

CE708 Introduction

This assignment comprises the following three exercises. 

Exercise 1: Write a Python program that reads a message from the user and generates its SHA-256 hash. Further, generates its MD5 hash and compares both hashes and explains the difference in output size and security properties in your report.

Exercise 2: Write a Python program that generates RSA keys (public and private) and encrypts a plaintext message using the public key. Then, decrypt the ciphertext using the private key and print the keys, ciphertext, and decrypted text.

Exercise 3: Write a Python program that simulates Diffie-Hellman Key Exchange, in which both parties agree on a prime p and base g. Each party selects a private key and computes the public key. Then, exchange public keys and compute the shared secret. Print all values and verify that both parties compute the same shared secret.

Challenge: Create a program that signs a message using the RSA private key (Digital Signature) and verifies the signature using the RSA public key. Then compute an HMAC (SHA-256) for the same message using a secret key. Finally, explain in the report why Digital Signatures and MACs serve different purposes.

Deliverables

You should submit a single zip file containing all the above programs and explanations. If you submit a file in any other format, you will lose 10% of the marks for this assignment.

1. Source code (.py) 2.
2. Minimum 3-minute Video demonstration: using a screen recorder, record a video from your source code and explain how you have written the code. Then, run the code and explain how it works.
3. Lastly, provide a critical analysis of the technique and explain how to improve your code.

CE708 Marking Scheme

40% percent of the marks will go to the video demonstrations and 60% of the marks will go to your code and report. If your code is submitted with compilation errors, you will automatically lose these marks.