---
id: lightdsa
version: "0.0.3"
license: unclear
license_treatment: permissive
maintenance: active
---

# lightdsa — A Lightweight Digital Signature Algorithm Library for Python

License: permissive · Maintenance: active · Downloads: 138.1K/mo

## What it is and what it does

LightDSA is a Python library for creating and verifying digital signatures using four different algorithms: ECDSA, EdDSA, RSA, and DSA. It abstracts away the complexity of key generation, curve selection, and signature operations behind a unified interface, allowing developers to initialize a cryptosystem with a chosen algorithm, generate or load keys, sign messages, and verify signatures.

The library supports multiple elliptic curve forms (Weierstrass, Koblitz, Edwards) and hundreds of pre-defined curves, with sensible defaults—secp256k1 for ECDSA and ed25519 for EdDSA. It depends on lightecc for elliptic curve operations, sympy for mathematical computations, and tqdm for progress indication. The package targets Python 3.5.5 and later and is designed as a lightweight alternative to heavier cryptographic frameworks.

Use it for:

- Sign and verify messages in peer-to-peer or blockchain applications using ECDSA with Bitcoin's secp256k1 curve.
- Implement EdDSA-based authentication systems with ed25519 for modern, post-quantum-resistant signature schemes.
- Export public keys for distribution to verifiers while keeping private keys secure for signing operations.
- Prototype cryptographic systems or educational demonstrations of digital signature algorithms without external C dependencies.
- Build lightweight embedded or IoT applications requiring signature verification with minimal dependencies.

## Worth the install?

AI-flagged interpretation of the facts above — verify before relying.

LightDSA provides digital signature generation and verification using ECDSA, EdDSA, RSA, and DSA algorithms with support for multiple elliptic curve forms and pre-defined curves.

Yes, if you need a lightweight, pure-Python digital signature library with multiple algorithm support and no external C dependencies. The MIT license, low install friction, and active maintenance make it a reasonable choice for prototyping or educational use. However, verify that the library's cryptographic implementations meet your security requirements before using it in production, given its recent release and lack of documented security audits.

## Install

pip install lightdsa
uv add lightdsa
poetry add lightdsa

## Installing lightdsa

Before you install: Low install friction with a pure-Python wheel and three lightweight runtime dependencies (lightecc, sympy, tqdm). The package is actively maintained with recent commits and no known vulnerabilities.

License in practice: MIT license permits free use, modification, and distribution with minimal restrictions, making it suitable for both open-source and commercial projects.

Quickstart:

pip install lightdsa

from lightdsa import LightDSA

dsa = LightDSA(algorithm_name="eddsa")
message = "Hello, world!"
signature = dsa.sign(message)
verifier_dsa = LightDSA(algorithm_name="eddsa", key_file="public.txt")
verifier_dsa.verify(message, signature)

Verify before relying:

- Whether the library's cryptographic implementations have undergone independent security audits or formal verification.
- Performance characteristics and suitability for high-throughput signing scenarios compared to established alternatives.
- Maturity of the codebase given the recent initial release date (2025-03-16).

## Package facts

- License: not declared (permissive)
- Python support: supports_current
- Install friction: low
- Maintenance: active
- Downloads: 138.1K/month (top 15,000 on PyPI)
- Known vulnerabilities: none known

## Tags

digital signature library python, ecdsa eddsa rsa implementation, elliptic curve cryptography, message signing and verification, lightweight crypto signatures, edwards curve dsa, key generation and export, cryptography, digital-signatures, elliptic-curves

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