NanoLock

NanoLock is a minimalist, ultra-secure command-line tool for symmetric text encryption and decryption.

It combines Argon2id (for robust key derivation) and Fernet (AES-128-CBC + HMAC-SHA256) to provide state-of-the-art security in under 100 lines of code. Its shortness makes it easily auditable, you can read and verify the entire logic in a few minutes.

Installation

pip install cryptography argon2-cffi

Usage

Run the script and follow the prompts to Encrypt (E) or Decrypt (D):

python nanolock.py

Configuration

By default, NanoLock is tuned for maximum security, using 1 GiB of RAM for key derivation to thwart brute-force attacks.

Important: If you are running this on a device with limited memory (e.g., Raspberry Pi, older laptop), you must edit nanolock.py and lower the memory_cost:

• Default: 1048576 (1 GiB)
• Low Memory: 524288 (512 MiB) or 262144 (256 MiB)
• Very Low Memory: 65536 (64 MiB)

Why NanoLock?

• Auditable: No hidden backdoors, no bloat. Just pure, standard cryptography.
• Secure: Uses 2025 best practices (Argon2id + authenticated encryption).
• Portable: A single Python file you can trust and carry anywhere.