🏦 ATM Management System

Professional banking system with encryption, real-time notifications & enhanced UI

C99 Standard MIT License XOR Encryption POSIX Threads Named Pipes IPC GitHub Actions CI/CD Professional Makefile
View on GitHub Features

🚀 Quick Start

git clone https://github.com/g-laliotis/atm-management-system.git cd atm-management-system make ./bin/atm # Sample credentials Username: Alice, Password: 1234password Username: Michel, Password: password1234

✨ Core Features

👤

User Management

Secure registration and login with unique username validation and encrypted password storage

💰

Account Operations

Create, update, and manage multiple account types: savings, current, fixed01/02/03

💸

Transactions

Deposit and withdraw with balance validation. Fixed accounts protected from transactions

📊

Interest Calculation

Automatic interest calculation: Savings 7%, Fixed01 4%, Fixed02 5%, Fixed03 8%

🔄

Transfer Ownership

Transfer accounts between users with instant real-time notifications

🗑️

Account Removal

Delete accounts with ownership verification and persistent storage updates

🎨 Bonus Features

🔐

Password Encryption

XOR cipher encryption for secure password storage in text files

🎯

Enhanced Terminal UI

Color-coded messages, professional layout with Unicode box-drawing characters

🔔

Real-time Notifications

Named pipes (FIFO) with background threads for instant transfer alerts

📁

Professional Structure

Organized folders: bin/, obj/, src/, data/, logs/, docs/

🗄️

SQLite Support

Optional database backend with conditional compilation (`make sqlite`)

🧪

Test Suite

Comprehensive automated testing with `make test` for all core functionality

🚀

CI/CD Workflows

GitHub Actions for automated testing, releases, and security analysis

⚡

Code Optimization

Modular design with separated utilities and reduced code duplication

🏗️ Project Structure

atm-management-system/ ├── bin/ # Compiled binaries ├── obj/ # Object files ├── src/ # Source code │ ├── header.h # Header file with structures │ ├── main.c # Main program and menu │ ├── auth.c # Authentication with encryption │ ├── system.c # Account management │ ├── utils.c # UI and notification utilities │ └── db.c # Database layer (SQLite optional) ├── data/ # Data storage │ ├── records.txt # Account records │ ├── users.txt # User credentials (encrypted) │ └── atm.db # SQLite database (when using make sqlite) ├── logs/ # Application logs ├── docs/ # Documentation │ ├── FEATURES.md # Additional features │ └── index.html # GitHub Pages ├── test_atm.c # Comprehensive test suite ├── .github/ # GitHub Actions workflows │ └── workflows/ # CI/CD automation ├── CHANGELOG.md # Version history ├── CONTRIBUTING.md # Contribution guidelines ├── DEVELOPMENT.md # Development summary ├── LICENSE # MIT License ├── Makefile # Build configuration └── README.md # Project documentation

💻 Building & Running

# Build with text files (default) make # Build with SQLite database make sqlite # Run comprehensive test suite make test # Run the application make run # or ./bin/atm # Clean build artifacts make clean # Show all targets make help # Install system-wide (optional) sudo make install

🧪 Testing Real-time Notifications

Open two terminals to test the instant notification system:

# Terminal 1 ./bin/atm # Login as Alice # Transfer account to Michel # Terminal 2 ./bin/atm # Login as Michel # You'll see instant notification when Alice transfers!

🔧 Technical Details

Language

C (C99 standard)

Threading

POSIX threads for notifications

IPC

Named pipes (FIFOs)

Encryption

XOR cipher

Build System

GNU Make

CI/CD

GitHub Actions

Optional DB

SQLite3

📚 Documentation

Complete documentation and development resources:

README Development Features Issues

🔒 Security

Security features implemented:

📈 Interest Rates

Savings Account

7% annual (monthly interest)

Fixed01 (1 year)

4% annual

Fixed02 (2 years)

5% annual

Fixed03 (3 years)

8% annual

Current Account

No interest