Image-Cipher

Steganography software for encrypting text into image that uses modified version of LSB (Least Significant Bit) algorithm. Project is part of this Medium article.

Usage:

GUI Application

Launch desktop application:

./gradlew :app:run

Or run the compiled JAR:

java -jar app.jar

Command Line Interface

The CLI has been redesigned with intuitive parameters and comprehensive help:

# Show help
java -jar app.jar --help

# Show version
java -jar app.jar --version

Encryption Examples:

# Encrypt text into image (interactive input)
java -jar app.jar --encrypt single-color --input photo.jpg

# Encrypt specific text
java -jar app.jar -e multi-color -i image.png -t "Secret message"

# Encrypt with output file
java -jar app.jar -e low-level-bit -i input.jpg -t "Hidden data" -o encrypted.png

# Encrypt from stdin
java -jar app.jar -e single-color -i photo.jpg -t :stdin

Decryption Examples:

# Decrypt text from image
java -jar app.jar --decrypt single-color --input encrypted.jpg

# Decrypt with verbose output
java -jar app.jar -d multi-color -i hidden.png --verbose

# Decrypt low-level bit data
java -jar app.jar -d low-level-bit -i steganographic.png

Available Algorithms:

• single-color: Basic LSB steganography in single color channel
• multi-color: Enhanced LSB using multiple color channels
• low-level-bit: Advanced bit-level manipulation
• rsa: RSA encryption with steganography (experimental, encryption only)

CLI Parameters:

• -h, --help - Show help message with examples
• -e, --encrypt <algorithm> - Encrypt text using specified algorithm
• -d, --decrypt <algorithm> - Decrypt text using specified algorithm
• -i, --input, --image <file> - Input image file path
• -o, --output <file> - Output image file (encryption only)
• -t, --text <text> - Text to encrypt (use :stdin for interactive input)
• -c, --certificate <file> - Certificate file for RSA encryption
• -v, --verbose - Enable detailed output
• --version - Show version information

Before encryption

After encryption

How does it work?

Error codes:

1 - IOException

2 - Invalid arguments (for example encrypting and decrypting at the same time)

Documentation is available on: JavaDoc

Additional tools

BinaryToImageConverter - converts any binary file to image.