ShiftLock

ShiftLock is a robust, cross-platform Caesar cipher CLI tool supporting multiple character sets and advanced error handling. It works on both Windows and Linux.

Key Features

• Cross-platform: Linux and Windows support
• Five character sets: basic, extended, alphanumeric, keyboard, unicode
• Correct Caesar cipher logic (A-Z and a-z shifted separately in basic mode)
• Unicode support
• Robust error handling and input validation
• Comprehensive test script
• NEW: Graphical User Interface (GUI)

Installation

Linux

./install.sh

Windows

No installation required. Run with Python:

python src/Shiftlock.py [operation] [options]

Usage

GUI Version (Recommended for beginners)

python src/ShiftlockGUI.py

The GUI provides:

• Easy-to-use interface with radio buttons and dropdowns
• Text input area for direct text entry
• File browser for file input
• Real-time output display
• Save to file option
• All character sets and operations available

CLI Version (Advanced users)

Encrypt text

python src/Shiftlock.py encrypt -t "Secret Message" -s 7

Decrypt file

python src/Shiftlock.py decrypt -f encrypted.txt -s 7 -o decrypted.txt

Brute-force decryption

python src/Shiftlock.py bruteforce -f ciphertext.txt

Options

• -t, --text TEXT: Input text
• -f, --file FILE: Input file
• -s, --shift N: Shift value (default: 3, range: -25 to 25)
• --charset SET: Character set (basic, extended, alphanumeric, keyboard, unicode)
• -o, --output FILE: Output file
• -v, --version: Show version
• -h, --help: Show help message

Testing

Run the test script:

bash tests/test_shiftlock.sh

License

MIT