Cryptography GitHub Repositories (2026) · Open Source Tools

End-to-end encrypted notes, tasks, files, passwords, journal and bookmarks. Keyed by a 12-word BIP-39 phrase: no email, no password, no account to leak. The full client source for web, desktop and mobile is published, along with the encryption (XChaCha20-Poly1305, HKDF-SHA256, Ed25519) and the threat model, so the privacy claims are falsifiable.

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

Bitcoin Core integration/staging tree

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

🛡 I2P: End-to-End encrypted and anonymous Internet

This is the development repository for the OpenFHE library. The current version is 1.6.1 (released on October 9, 2026).

The simplest and most extensible zkVM. Fast and fully open source from a16z crypto and friends. ⚡

Cryptography Toolkit

Decentralized cryptocurrency blockchain daemon implementing the XRP Ledger protocol in C++

Unlocking the Full Potential of OPC UA with Typescript and NodeJS - http://node-opcua.github.io/

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

🔑 Local-first Secrets Manager

BouncyCastle.NET Cryptography Library (Mirror)

A p2p, secure file storage, social network and application protocol

Go implementation of Tink

Easy file sharing with server-side encryption, curl/httpie/wget compliant

Noir is a domain specific language for zero knowledge proofs

attestation.app remote attestation server. Server code for use with the Auditor app: https://github.com/GrapheneOS/Auditor. It provides two services: submission of attestation data samples and a remote attestation implementation with email alerts to go along with the local implementation based on QR code scanning in the app.

Lightning Network Daemon ⚡️

STARK-based virtual machine