Top 23 Cryptography Open-Source Projects

1. Bitcoin

   1 916 89,267 10.0 C++

   Bitcoin Core integration/staging tree

   

   Project mention: Brief: Bitcoin Core Governance Analysis | news.ycombinator.com | 2026-04-10

2. SaaSHub

   www.saashub.com featured

   SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives

   

3. JavaScript

   2 18 34,186 3.5 JavaScript

   Algorithms and Data Structures implemented in JavaScript for beginners, following best practices. (by TheAlgorithms)

   

4. OpenSSL

   3 186 30,267 9.9 C

   General purpose TLS and crypto library

   

   Project mention: Building a web server in aarch64 assembly to give my life (a lack of) meaning | news.ycombinator.com | 2026-05-11

   You could borrow the output of the perl scripts from openssl.

   https://github.com/openssl/openssl/blob/master/crypto/aes/as...

5. Ciphey

   4 27 21,429 0.0 Rust

   ⚡ Automatically decrypt encryptions without knowing the key or cipher, decode encodings, and crack hashes ⚡

   

6. gun

   5 249 19,054 4.2 JavaScript

   An open source cybersecurity protocol for syncing decentralized graph data.

   

   Project mention: Gun: An Ecosystem of Tools for Distributed Applications | dev.to | 2026-02-16

   Documentation

7. javascript-obfuscator

   6 49 16,091 8.0 TypeScript

   A powerful obfuscator for JavaScript and Node.js

   

8. bounty-program

   7 10 15,337 6.7

   Zama Bounty Program: Contribute to the FHE space and Zama's open source libraries and get rewarded 💰

   

9. Cryptomator

   8 504 15,214 9.8 Java

   Cryptomator for Windows, macOS, and Linux: Secure client-side encryption for your cloud storage, ensuring privacy and control over your data.

   

   Project mention: Show HN: Stop paying for Dropbox/Google Drive, use your own S3 bucket instead | news.ycombinator.com | 2026-04-07

   > I dislike Dropbox for reasons that aren't technical, but the big thing for me is that I want either E2EE, or control/ownership of where my data is stored.

   You could run something like Cryptomator on top of Dropbox:

   https://cryptomator.org/

   It even has (paid) iOS and Android apps for mobile access.

10. libsodium

    9 30 13,731 9.5 C

    A modern, portable, easy to use crypto library.

    

11. monero

    10 557 10,585 9.8 C++

    Monero: the secure, private, untraceable cryptocurrency

    

    Project mention: Play Flash games on mobile with Ruffle Virtual Keyboard | dev.to | 2025-07-25

    About Monero: https://getmonero.org

12. CryptoSwift

    11 7 10,556 6.0 Swift

    CryptoSwift is a growing collection of standard and secure cryptographic algorithms implemented in Swift

    

13. PySyft

    12 8 9,901 9.9 Python

    Perform data science on data that remains in someone else's server

    

14. Paramiko

    13 12 9,779 6.0 Python

    The leading native Python SSHv2 protocol library.

    

15. PrivateBin

    14 165 8,353 9.8 PHP

    A minimalist, open source online pastebin where the server has zero knowledge of pasted data. Data is encrypted/decrypted in the browser using 256 bits AES.

    

    Project mention: I Audited the Privacy of Popular Free Dev Tools, the Results Are Terrifying | news.ycombinator.com | 2026-03-03

16. lnd

    15 251 8,150 9.9 Go

    Lightning Network Daemon ⚡️

    

17. cryptography

    16 70 7,617 9.9 Python

    cryptography is a package designed to expose cryptographic primitives and recipes to Python developers.

    

18. rustls

    17 63 7,430 9.9 Rust

    A modern TLS library in Rust

    

    Project mention: RFC 9849. TLS Encrypted Client Hello | news.ycombinator.com | 2026-03-04

19. Awesome Cryptography

    18 8 6,981 2.8

    A curated list of cryptography resources and links.

    

20. RsaCtfTool

    19 9 6,963 7.6 Python

    RSA attack tool (mainly for ctf) - retrieve private key from weak public key and/or uncipher data

    

21. mbedTLS

    20 11 6,693 9.8 C

    An open source, portable, easy to use, readable and flexible TLS library, and reference implementation of the PSA Cryptography API. Releases are on a varying cadence, typically around 3 - 6 months between releases.

    

22. upspin

    21 25 6,399 4.4 Go

    Upspin: A framework for naming everyone's everything.

    

    Project mention: Stop Forwarding Errors, Start Designing Them | news.ycombinator.com | 2026-01-04

    Looks very similar to what Upsin ( Go ) errors look like:

    https://github.com/upspin/upspin/blob/master/errors/errors.g...

        type Error struct {

23. tendermint

    22 33 5,863 0.0 Go

    ⟁ Tendermint Core (BFT Consensus) in Go

    

24. Crypto++

    23 7 5,464 4.4 C++

    free C++ class library of cryptographic schemes

    

Cryptography related posts

• Show HN: DropLock – E2EE secret sharing web app with no back end

  1 project | news.ycombinator.com | 2 Jun 2026

• Show HN: AERF, signed control events for AI agent actions

  3 projects | news.ycombinator.com | 2 Jun 2026

• wolfSSL releases a new product; wolfCOSE a zero alloc C embbedded COSE stack

  2 projects | news.ycombinator.com | 30 May 2026

• zkML Inference Proof: What the Receipt Proves, and What the Model Still Does Not

  1 project | dev.to | 23 May 2026

• Show HN: Freenet, a peer-to-peer platform for decentralized apps

  7 projects | news.ycombinator.com | 21 May 2026

• ejbca – Open-source public key infrastructure (PKI) and CA software

  1 project | news.ycombinator.com | 19 May 2026

• Ubuntu 26.04: Goodbye sudo, Hello Rust and Post-Quantum SSH

  1 project | dev.to | 18 May 2026
• A note from our sponsor - SaaSHub
  www.saashub.com | 7 Jun 2026

  SaaSHub helps you find the best software and product alternatives Learn more →

Index

Sponsored

SaaSHub - Software Alternatives and Reviews

SaaSHub helps you find the best software and product alternatives

www.saashub.com