Simple Crypto

A Python mini-utility for symmetric "shift" file encryption. It works on the principle of Caesar's byte cipher: each byte is shifted by key (0-255) in a round-robin fashion.

Features

• Any file type – text, image, archive…

• CLI one-liner – all configuration via command line arguments.

• Zero-deps – only standard Python library ≥3.8.

• Cross-platfor – Windows / macOS / Linux.

Important This is my educational example: the algorithm does not protect against serious cryptanalysis. Use > > only for practice or masking data without high value.

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Installation (developer option)

# 1. Clone the project
git clone https://github.com/Filitin/my-first-projects.git
cd my-first-projects

# 2. (Optional) create a virtual environment
python -m venv .venv
# Linux/macOS
source .venv/bin/activate
# Windows (PowerShell)
.venv\Scripts\activate

# 3. Install the package in editable mode
pip install -e .

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Quick start

Encrypt any file

python -m simple_crypto encrypt secret.txt 42 -o secret.enc

Deciphering

python -m simple_crypto decrypt secret.enc 42 -o secret.txt