CryptPad: end-to-end encrypted collaboration suite

CryptPad: end-to-end encrypted collaboration suite

CryptPad: end-to-end encrypted collaboration suite

CryptPad.org

End-to-end encrypted collaborative office suite

Nextcloud vs. CryptPad: Which Privacy-First Collaboration Tool is Right for You?

Two offerings that promise privacy and control, yet each takes a different path.

Encrypted Spaces — Research preview

An architecture for collaborative applications where data is encrypted and operations are cryptographically verifiable.

osvauld/osvauld

Fully open-source, end-to-end encrypted, peer-to-peer application suite.

swicg/activitypub-e2ee

Coordination of work on end-to-end encryption with ActivityPub

Privy Blog | Privy and Stripe: Bringing crypto to everyone

We started Privy a little over three years ago to make it easy for any developer to build better products on crypto rails. Whether crypto is core to your app or simply a new layer of functionality, a good crypto product should just feel like a good product, period. By making crypto usable, we help make it useful for everyone.

Cryptomator - Free & Open-Source Cloud Storage Encryption

Cryptomator is an open-source encryption tool for secure cloud storage. Protect your privacy for free on Dropbox, Google Drive, OneDrive, and more.

Keybase Book

Use Keybase for end-to-end encrypted chat messaging, file sharing, and team collaboration. Get the free app for iOS, Mac, Android, Windows, and Linux.

Keybase Book

Use Keybase for end-to-end encrypted chat messaging, file sharing, and team collaboration. Get the free app for iOS, Mac, Android, Windows, and Linux.

Architecture

Overview of Ente's end-to-end encrypted architecture—learn how your data is encrypted on-device, securely shared, and safely stored using cryptography.

BeeKEM: Decentralized, Secure and Efficient Group Key Agreement

Group key agreement protocols are essential for modern secure messaging. Most existing group key agreement protocols assume a centralized model with a semi-trusted service that mediates the communication. This is efficient, but problematic for some important applications, since a central service can be a choke point for surveillance and censorship. There is a nascent literature on decentralized group key agreement that avoids such reliance, but existing proposals either do not scale, with update costs linear or quadratic in the group size, or lack proofs of security. Centralized protocols can offer much lower (logarithmic) cost. We present BeeKEM, the first decentralized group key agreement protocol with logarithmic update cost in the common case (degrading to linear in the worst case) and proofs of security. We provide an open-source implementation and demonstrate that it is competitive with OpenMLS. BeeKEM opens the door for a range of communication and collaboration applications offering not only end-to-end encryption, but also metadata privacy and censorship resistance.

NextGraph - Decentralized, encrypted and local-first platform and framework, towards the better internet we all deserve!

Features a social network, shared documents, productivity tools, an app store, and more! You can use NextGraph for free : resilient, secure, private and encrypted. You own your data and software! Developers can build new web3.0 local-first apps with our open source framework, based on open standards, with CRDTs, E2EE, Linked Data, JSON, Markdown...

Key Agreement for Decentralized Secure Group Messaging with Strong Security Guarantees

Secure group messaging protocols, providing end-to-end encryption for group communication, need to handle mobile devices frequently being offline, group members being added or removed, and the possibility of device compromises during long-lived chat sessions. Existing work targets a centralized network model in which all messages are routed through a single server, which is trusted to provide a consistent total order on updates to the group state. In this paper we adapt secure group messaging for decentralized networks that have no central authority. Servers may still optionally be used, but they are trusted less. We define decentralized continuous group key agreement (DCGKA), a new cryptographic primitive encompassing the core of a decentralized secure group messaging protocol; we give a practical construction of a DCGKA protocol and prove its security; and we describe how to construct a full messaging protocol from DCGKA. In the face of device compromise our protocol achieves forward secrecy and post-compromise security. We evaluate the performance of a prototype implementation, and demonstrate that our protocol has practical efficiency.

Making end-to-end encrypted AI chat feel like logging in

We want private AI chat to be simple. Yet today, many end-to-end encrypted experiences still have a level of friction that make them feel like they’re from another era: it usually either involves a long seed phrase users are asked to “store securely,” insecure password based encryption, or apps that aren’t cross-device and lose your data periodically (on reinstall, browser cache clear, etc).