MeowPassword C

A secure, memorable password generator that uses cat names to create strong passwords. Ported from Swift to pure C11 for Linux/Debian systems.

Features

• Generates passwords using 16,913 embedded cat names
• Shannon entropy analysis for password strength
• Kolmogorov complexity estimation
• Pattern complexity and character diversity scoring
• Configurable password length and complexity
• Clipboard support via xclip
• No external dependencies (pure C11)

Building

Using Make

make

Using CMake

mkdir build && cd build
cmake ..
make

Installation

sudo make install

Usage

# Generate a password with default settings
./meowpass

# Generate with specific length
./meowpass -l 20

# Generate with specific complexity (1-10)
./meowpass -c 8

# Verbose output with analysis
./meowpass -v

# Copy to clipboard
./meowpass --copy

# Run tests
./meowpass --test

# Show help
./meowpass --help

How It Works

1. Selects random cat names from the embedded dictionary
2. Joins names in lowercase
3. Randomly capitalizes some characters
4. Inserts random digits
5. Replaces some characters with symbols
6. Analyzes resulting password for entropy and complexity

Complexity Analysis

The password analysis includes:

• Shannon Entropy: Information entropy in bits per character
• Compression Ratio: Kolmogorov complexity approximation
• Pattern Complexity: Substring uniqueness score
• Character Diversity: Coverage of lowercase, uppercase, digits, symbols

Requirements

• C11 compiler (gcc or clang)
• Linux system
• Optional: xclip for clipboard support

License

MIT License - see LICENSE file for details.

Author

Jeffrey Kunzelman

Credits

Original Swift implementation: MeowPassword