📝 SecureDiary CLI

SecureDiary is a simple command-line tool to securely create and retrieve encrypted text entries (like diary entries). Each entry is AES-GCM encrypted using a password and saved as a .json file, ensuring confidentiality and integrity.

🔐 Features

• Create password-protected encrypted text entries
• Optionally import from .txt files
• Retrieve and decrypt entries interactively
• Secure AES-GCM encryption using a key derived from your password (PBKDF2)
• Simple config file to set a persistent save directory

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🛠 Installation

1. Clone this repository or copy enc.py and place it in your project directory.
2. Install the required Python package:

pip install cryptography

or

pip install -r requirements.txt

3. Create a config file in the same directory named .tool_config.json with the following content:

{
  "entries_dir": ""
}

This will be updated automatically when you set the save directory.

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🚀 Usage

1. Set or update save directory

python3 enc.py --savedir /path/to/your/entries

This updates the save path in .tool_config.json.

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2. Make a new encrypted entry

Option 1: Type interactively

python3 enc.py --make_entry

You will be prompted to enter:

• A password
• The content of your entry
• A filename (or press enter to use timestamp)

Option 2: Import from .txt file

python3 enc.py --make_entry --file your_text_file.txt

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3. Retrieve and decrypt an entry

python3 enc.py --get_entry

This will:

• List all saved entries
• Prompt you to select one
• Ask for the password
• Decrypt and display the entry

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📂 File Structure

• enc.py: Main CLI script
• .tool_config.json: Stores the directory path to save encrypted entries
• your_entries/: Directory where encrypted .json files are stored

Each entry file contains:

{
  "salt": "...",
  "nonce": "...",
  "ciphertext": "...",
  "tag": "..."
}

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⚠️ Security Notes

• Encryption is done using AES-GCM with 256-bit key.
• Keys are derived using PBKDF2 with SHA-256 and 480,000 iterations.
• If you forget the password for an entry, it cannot be recovered.
• Keep .tool_config.json and your entries directory safe and secure.

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📌 Requirements

• Python 3.7+
• cryptography package

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📄 License

MIT License — feel free to use, modify, and distribute.