lightdsa
A Lightweight Digital Signature Algorithm Library for Python
Decision gist · record as of 2026-08-14
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.AI-flagged interpretation of the facts on this page — verify before relying
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 · maintenance · safety
permissive license (permissive) — MIT license permits free use, modification, and distribution with minimal restrictions, making it suitable for both open-source and commercial projects.
last release 2025-04-01 (500 days) · last repo commit 2026-05-13 · 5 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 138,057 downloads/mo, #11,345 on PyPI
Alternatives
Verify before relying
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)- 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).
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 on this page. Verify before relying on it.
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
lightdsa on PyPI
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 | permissive license permissive |
| Python support | Supports the current Python release >=3.5.5 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 3 packageslighteccsympytqdm |
| Maintenance | Actively maintained 500 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 138,057 / month, #11,345 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | License :: OSI Approved :: MIT LicenseOperating System :: OS IndependentProgramming Language :: Python :: 3 |
Evidence: lightdsa-0.0.3-py3-none-any.whl
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See also lightecc · lightphe · securesystemslib · ecdsa · starkbank-ecdsa · ECPy · fastecdsa · sshpubkeys · PGPy13 · SLH-DSA