BitCascade 🔐

A custom symmetric encryption algorithm implementation with graphical interface, designed for educational purposes to demonstrate cryptographic principles.

Features ✨

• Custom Encryption Algorithm: Original symmetric cipher with confusion and diffusion techniques
• Graphical Interface: User-friendly SFML-based GUI
• Block Processing: Handles texts of any length using 8-byte blocks
• File Operations: Save and load encrypted texts
• Key Validation: Detects incorrect decryption keys
• Educational Focus: Perfect for learning cryptography concepts

Algorithm Overview 🧠

Security Characteristics

• Strong Key Sensitivity: Minimal key changes produce completely different ciphertexts
• Effective Diffusion: Single plaintext bit alterations affect multiple ciphertext bytes
• Pattern Resistance: Obscures statistical relationships between plaintext and ciphertext
• Multi-Round Protection: 5 encryption rounds with layered security
• Dynamic Subkeys: Unique subkeys per round derived from key, round number, and position

Technical Design

• Block Size: 8-byte blocks with PKCS7 padding
• Rounds: 5 encryption/decryption rounds
• Confusion Phase: XOR operations with dynamic subkeys and positional variations
• Diffusion Phase: Bit rotations, sequential XOR mixing, and zig-zag transposition

Installation & Usage 🚀

Prerequisites

• C++ Compiler (GCC, Clang, or MSVC)
• SFML Library
• CMake (optional)

Building

git clone https://github.com/JimenaD-creator/Encryption-Algorithm.git
cd Encryption-Algorithm

Running

./gui.exe

Usage examples 💡

Encryption

• Launch the application
• Select "Encrypt Text"
• Enter plaintext (max 100 characters)
• Provide encryption key (max 16 characters)
• Save encrypted output to file

Decryption

• Choose "Decrypt Text"
• Select encrypted file
• Enter decryption key
• System validates key and decrypts content

Note: This implementation is for educational purposes and should not be used for securing sensitive real-world data.