Project Details

Desktop App / Security 2024

RSA & ElGamal Encryption App

An Information Security course project to research and implement two popular asymmetric (public-key) cryptosystems: RSA and ElGamal. A Desktop application was built with Java/JavaFX to simulate the process.

Java JavaFX Python RSA ElGamal Cryptography

Technical Description & Role

As the **Main Developer**, I was responsible for researching the mathematical theory and implementing the encryption algorithms from scratch, rather than using built-in libraries.

The project was divided into two parts:

Desktop Application (Java & JavaFX): Built a UI using JavaFX, allowing the user to:
- Automatically generate a Public/Private Key pair for RSA.
- Input plaintext and a Public Key to perform Encryption.
- Input ciphertext and a Private Key to perform Decryption.
- Simulate the detailed mathematical steps (like calculating $n$, $\phi(n)$, $e$, $d$).
Research Script (Python):
- Implemented the **RSA** algorithm in Python to cross-validate the results from the Java version.
- Implemented the **ElGamal** algorithm, a cryptosystem based on the Discrete Logarithm problem, for comparison.

Through this project, I gained a deep understanding of the mathematical foundations of cryptography (Prime Numbers, Modulo Arithmetic, Euler's Theorem) and how to apply them in practical programming.

Project Type

Course Project (Information Security)

Timeline

Approx. 2 Months

My Role

Main Developer

Team

Personal / Small Group

Deliverable

Desktop App (Java) & Script (Python)

Algorithm Implementation Process

Mathematical Research

Studied the theory of asymmetric cryptosystems, the prime factorization problem (RSA), and the discrete logarithm problem (ElGamal).

Key Generation Implementation

Wrote helper functions: Primality testing (Miller-Rabin), finding modular inverse (Extended Euclidean Algorithm), and modular exponentiation.

Encryption & Decryption Implementation

Wrote the Encryption (using Public Key) and Decryption (using Private Key) functions based on the researched mathematical formulas.

Building the GUI (JavaFX)

Integrated the algorithm functions (written in Java) into a graphical desktop application, allowing for intuitive user interaction.

Tools & Technologies

The project used Java for the Desktop application and Python for research and algorithm verification.

Java Platform

Java (Core) JavaFX Scene Builder Eclipse / IntelliJ

Python Platform

Python 3 Math library

Theory

Euclidean Algorithm Euler's Theorem Discrete Logarithm

Project Impact

A complete desktop application capable of accurately simulating 2 asymmetric cryptosystems.

Cryptosystems (RSA, ElGamal)

100%

Accurate Encryption & Decryption

Languages (Java, Python)

JavaFX Desktop App

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