A secure and private messenger that's lightning fast, scalable, and identity-free.
Quiet - Private messaging. No servers.
Quiet is available for all major platforms. (And eventually the web, too!)
Signal Messenger: Speak Freely
Say "hello" to a different messaging experience. An unexpected focus on privacy, combined with all of the features you expect.
Wave - Secure Messaging App
Privacy-first messaging with quantum-level encryption. No signup, fully decentralized, zero tracking.
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.
Delta Chat: Delta Chat, decentralized secure messenger
Delta Chat is a decentralized and secure messenger app 💬 Reliable instant messaging with multi-profile and multi-device support ⚡️ Sign up to secure fast chatmail servers or use classic e-mail serv...
Delta Chat: Delta Chat, decentralized secure messenger
Delta Chat is a decentralized and secure messenger app 💬 Reliable instant messaging with multi-profile and multi-device support ⚡️ Sign up to secure and interoperable chatmail relays 🥳 Interactive ...
An End-to-End Encrypted Peer-to-Peer Chat System with Self-Sovereign Identity
Today, messaging applications are the most popular medium of communication over the Internet. As their use has grown, different security and privacy concerns have received the attention of users. Users consider what they send with others to be private, tamper-proof and secure without getting exposed to unintended entities. Furthermore, users are concerned whether their data is exposed if the service provider encounters any cyber attack. In this paper, we propose a Self-Sovereign Identity (SSI)-based End-to-End Encrypted Peer-to-Peer (E2EE P2P) chat system that does not rely on any specific provider, enhancing user privacy and security. The system leverages decentralized identifiers (DIDs) to establish secure communication channels using the DIDcomm (DID Communications) protocol, which ensures the privacy of user data. We also introduce a secure file sharing mechanism that ensures that all data, including messages, are stored solely on the user's device, further safeguarding user privacy. The system is developed following the Design Science Methodology, addressing probable threats and satisfying different functional and security requirements. The architecture and its implementation details are discussed with the subsequent use cases and protocol flow. Finally, we analyze different aspects of the system.
Stream: Private Voice Ring — Notes, Chat, Dictation
Experience Stream — the private voice ring for everything on your mind. Pre-order today
Delta Chat is a decentralized and secure messenger app | Hacker News
This is useful if you want to keep the content of your messages secure, but if you need to keep your identity, social graph and the fact that you conversed with certain people obfuscated, I don't think Delta Chat via email is a good solution.
Dash Chat
Secure messaging that keeps working when the internet doesn't. Dash Chat is an offline-first, end-to-end encrypted messenger for communities that need to stay connected.
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.
Private Chat Backups with Local-First Principles
Introducing encrypted chat backups and multi-device syncing that extends our end-to-end privacy principles to persistent cloud storage.
Webxdc: mini apps shared in a chat
Secure mini apps for chats. No internet access, no tracking, no servers.
