77 lines
1.7 KiB
Markdown
77 lines
1.7 KiB
Markdown
# NOJSCAP
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**NOJSCAP** is a minimal Proof-of-Work based CAPTCHA system. It includes both:
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- A **NOJSCAP client** that computes valid nonces for challenge strings using SHA-256.
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- A **NOJSCAP server** that issue challenges and verify solutions over HTTP.
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This repository is structured as a monorepo containing both the client and server codebases.
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Read project background: [https://libroot.org/posts/project-nojscap/](https://libroot.org/posts/project-nojscap/)
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---
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## Structure
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```
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.
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├── client/ # Proof-of-Work nonce generator implementations
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└── server/ # Server-side challenge issuers & verifiers
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```
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---
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## Client
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The client directory includes NOJSCAP client implementations in multiple languages. Each version takes a challenge string and a difficulty level, then searches for a nonce such that the SHA-256 hash of `challenge + nonce` begins with the required number of leading zero bits.
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### Supported Languages
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- **C**: `nojscap.c`
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- **Go**: `nojscap.go`
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- **Python**: `nojscap.py`
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- **JavaScript (Node.js)**: `nojscap.js`
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- **Rust**: `nojscap.rs`
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Each implementation is self-contained and demonstrates equivalent functionality.
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---
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## Server
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The `server` directory contains example implementations in multiple languages of NOJSCAP servers that issue PoW challenges and validate solutions.
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### Available Servers
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* **Python + Flask**
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```sh
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cd server/python-html
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python3 server.py
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```
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* **TypeScript + Express**
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```sh
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cd server/ts-express
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npm install
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npx tsx start
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```
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* **Go + net/http**
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```sh
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cd server/go-http
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go run server.go
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```
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Each server implementation listens for challenge requests and verifies submitted nonces against the configured difficulty level.
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---
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## License
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GNU AGPLv3
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