Crypyt

CRYPT-AES-256-GCM - Military-grade encryption toolkit for secure communications

About

Crypyt is a lightweight, high-performance encryption toolkit implementing AES-256-GCM (Advanced Encryption Standard with Galois/Counter Mode), the same encryption standard used by governments and financial institutions worldwide. Designed as a middleware component for building secure communication applications, Crypyt provides battle-tested cryptographic operations through simple command-line tools.

Key features

• 🔐 AES-256-GCM encryption - Industry-standard authenticated encryption
• 🛡️ Authentication tags - Prevents message tampering and ensures integrity
• 🎲 Random IVs - Each encryption uses unique initialization vectors
• ⚡ High performance - Optimized C++ implementation with OpenSSL
• 🔧 Flexible interface - Command-line arguments or interactive mode
• 🔌 Middleware ready - Perfect for building secure communication apps
• 🐧 Linux native - Designed for Linux systems

Use cases

• Secure messaging applications
• File encryption services
• API authentication middleware
• Password managers
• Encrypted backup systems
• IoT device communication

Installation

Prerequisites

Crypyt requires OpenSSL libraries to be installed on your system:

# Debian/Ubuntu
sudo apt update
sudo apt install libssl3

# Fedora/RHEL
sudo dnf install openssl-libs

# Arch Linux
sudo pacman -S openssl

Install Crypyt

# Download the binaries
# (download encrypter and decrypter from releases)

# Make them executable
chmod +x encrypter decrypter

# Install to system
sudo mv encrypter /usr/local/bin/crypyt-encrypt
sudo mv decrypter /usr/local/bin/crypyt-decrypt

# Verify installation
crypyt-encrypt -h
crypyt-decrypt -h

Usage

Command-line mode

Encrypt a message:

crypyt-encrypt -k "your_secret_key" -m "Hello, World!"

Decrypt a message:

crypyt-decrypt -k "your_secret_key" -c "iv:tag:ciphertext"

Note: Always wrap arguments containing special characters in quotes:

crypyt-encrypt -k "my;complex>key!" -m "Message with spaces"

Interactive mode

Simply run without arguments for guided prompts:

crypyt-encrypt
# Follow the prompts...

crypyt-decrypt
# Follow the prompts...

Integration example

Use Crypyt as middleware in your applications:

# Bash script example
#!/bin/bash

# Encrypt user message
encrypted=$(crypyt-encrypt -k "$SECRET_KEY" -m "$USER_MESSAGE")

# Send encrypted message over network
curl -X POST https://api.example.com/send -d "payload=$encrypted"

# Receive and decrypt response
response=$(curl https://api.example.com/receive)
decrypted=$(crypyt-decrypt -k "$SECRET_KEY" -c "$response")
echo "Received: $decrypted"

Security features

• 256-bit key derivation - Uses SHA-256 to derive strong keys from passwords
• Authenticated encryption - GCM mode provides both confidentiality and authenticity
• Tamper detection - Any modification to encrypted data is automatically detected
• No key reuse - Random IVs ensure the same message encrypts differently each time
• Memory safety - Sensitive data is cleared from memory after use

Performance

• Encryption speed: ~500 MB/s (depending on hardware)
• Key derivation: <1ms per operation
• Memory footprint: <5 MB per process

License

MIT License - See LICENSE file for details

Disclaimer

This software is provided for legitimate security purposes. Users are responsible for compliance with applicable laws and regulations regarding encryption in their jurisdiction.

Support

For issues, questions, or feature requests, please open an issue on the project repository.

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Crypyt - Secure communications made simple.