Invitation cards in front of a notebook with a MLS sticker.
AIR
• No phone number or email
• End-to-end encrypted
• No metadata retention
• Open-source
• Post-quantum secure
• Based on Messaging Layer Security (MLS) and open standards
• EU-based
We will be at #FOSDEM and will bring something exciting: Invitation codes for the beta phase of @air.ms, our new secure messenger based on MLS! ✨
Hit @julianmair.com up if you’d like to join the beta with your friends.
30.01.2026 10:03
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Invitation cards in front of the ALL CREATURES WELCOME banner
AIR
• No phone number or email
• End-to-end encrypted
• No metadata retention
• Open-source
• Post-quantum secure
• Based on Messaging
Layer Security (MLS) and open standards
• EU-based
We will be at #39C3 and we brought something exciting: Invitation codes for the beta phase of Air, our new secure messenger based on MLS! ✨
Hit us up if you’d like to join the beta with your friends.
You can also follow @air.ms, where we’ll post updates over time.
26.12.2025 17:22
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Our solution builds on research by Alwen et al., using Puncturable Pseudorandom Functions (PPRFs) to allow multiple group states to coexist securely.
This means:
- No need for a central ordering service
- Maintain Forward Secrecy even with forks
- Better support for decentralized messaging
29.10.2025 09:36
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Making MLS more decentralized
It’s no secret that we at Phoenix R&D are big fans of the Messaging Layer Security (MLS) protocol, having helped it to come into existence. It’s a versatile group key agreement and messaging protocol ...
We made MLS more decentralized! We are excited to share DMLS that brings fork resilience to the MLS protocol, solving a key challenge in distributed systems while maintaining Forward Secrecy.
This work was made possible by @equalitie.bsky.social, who funded it as part of the Breakout program.
29.10.2025 09:36
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Unser Brandbrief zur geplanten Chatkontrolle – eine Gefährdung der digitalen Sicherheit Deutschlands | Phoenix R&D
🚨Der Gesetzentwurf zur #Chatkontrolle sieht vor, dass digitale Kommunikation einschließlich verschlüsselter Nachrichten und Fotos gescannt werden soll.
Die Sicherheit von sicheren Messenger-Diensten ...
🚨 Der Gesetzentwurf zur #Chatkontrolle sieht vor, dass digitale Kommunikation einschließlich verschlüsselter Nachrichten und Fotos gescannt werden soll.
Wir haben uns an die deutsche Bundesregierung gewandt, sich am 14. Oktober gegen den Gesetzesvorschlag der Chatkontrolle auszusprechen.
06.10.2025 20:02
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Combining TLS and MLS: An experiment
We did a thing. We combined TLS and MLS into a hybrid protocol. Of course, when things get serious, full names are in order: We combined the Transport Layer Security protocol and the Messaging Layer S...
We did a thing. We combined TLS and MLS into a hybrid protocol.
Why? Because sometimes you need connections that last for weeks, quantum-resistant security, or simpler certificates.
The experiment is open-source. Here's the story 👇
02.07.2025 08:06
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Phoenix R&D (Remote): Freelance Junior Product Manager (all genders, part-time)
Phoenix R&D GmbH has a remote job opening for Freelance Junior Product Manager (all genders, part-time) (published: 15.05.2025). Apply now or check the other available jobs.
We are #hiring a Freelance Junior Product Manager to help us build the next generation of private & secure messaging.
If you’re interested in joining our team, please apply today!
For friends of secure messaging 🥷, please share our post with potential candidates.
15.05.2025 09:51
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Happy to announce that I’ll be speaking at @passthesaltcon.bsky.social on July 2nd!
I’ll discuss end-to-end encryption with MLS, the growing MLS ecosystem, the MIMI IETF working group, and metadata protection.
It’s my first time attending, and I look forward to connecting with the French community!
14.05.2025 08:08
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Information on RFC 9750 » RFC Editor
The MLS Architecture document – the companion document to the MLS Protocol document – is now finally available as RFC 9750:
www.rfc-editor.org/info/rfc9750
22.04.2025 21:08
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MLS is efficient, but what does that mean in practice?
This paper sheds some light on the question by building a test framework for OpenMLS.
arxiv.org/pdf/2502.18303
27.02.2025 00:18
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We are happy @opentechfund.bsky.social is supporting our mission to bridge the gap in the secure messenger space by developing a new technological foundation for secure and private messaging that combines functional, privacy, and security features in a way that addresses a variety of threat models.
21.01.2025 13:17
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Phoenix R&D
More end-to-end encryption. More privacy. Building messaging technology that’s raising the bar.
A good part of the team joined the #38C3 which was a good way to end the year. 2025 will be an exciting year for us, we will share updates about our work along the way. You can follow us here or subscribe to our blog at blog.phnx.im/#/portal/signup.
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📸 Leah Oswald (CC BY-SA 2.0)
07.01.2025 10:05
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Happy New Year! Phoenix R&D enters 2025 with some good news! Over the last few months we have doubled our team size, which will help us shorten our development cycles.
We are excited about the new research projects. These projects also allow us to further diversify our sources of income.
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07.01.2025 10:05
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This weekend, @raphaelrobert.bsky.social and @julianmair.com are joining the #GlobalGathering.
We will be hosting a booth and circle on Saturday to discuss the current state of privacy preserving and decentralized messengers.
We look forward to seeing you at there! Feel free to ping us!
26.09.2024 12:21
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Jobs at Phoenix R&D GmbH | JOIN
Jobs at Phoenix R&D GmbH. Browse all open positions and become part of our growing team! We are currently looking for additions to our company. Apply today!
We #hiring a full-time and a freelance Senior Rust Engineer to help us build the next generation of private & secure messaging.
If you’re interested in joining our team, please apply today! For friends of secure messaging 🥷, please share our post with potential candidates.
04.09.2024 10:50
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- Prospective integration in platforms, like Firefox and Android
- Metadata protection in MLS
- Using MLS as a general purpose key establishment mechanism beyond messaging in e.g.: video conferencing, password managers, hypervisors, enclaves, etc.
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28.03.2024 09:25
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Raphael Robert standing on RWC stage
We attended the Real World Crypto Symposium in Toronto 🇨🇦 where @raphaelrobert.bsky.social talked about how far MLS has come since RWC 2019.
Highlights:
- Post-quantum resistance and how easy it is to upgrade from current schemes
- Deployment in existing products like Webex and Discord
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28.03.2024 09:24
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RFC 9420 or how to scale end-to-end encryption with Messaging Layer Security
They call it RFC 9420, we say MLS: A new IETF standard for end-to-end encryption was published in July and brings large improvements in p...
In case you missed our talk about Messaging Layer Security (MLS) at #37C3, you can re-watch it now.
MLS brings substantial improvements in performance and security compared to existing protocols.
#securemessaging #encryption #e2ee #messaginglayersecurity
09.01.2024 09:35
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Raphael presenting MLS at 37C3
We ended 2023 with a talk at #37C3. @raphaelrobert.bsky.social and Konrad presented Messaging Layer Security (MLS).
The room was packed and some people couldn't attend – luckily the talk is now online.
🍿 media.ccc.de/v/37c3-12064...
#securemessaging #encryption #e2ee #messaginglayersecurity
03.01.2024 09:25
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Lecture: RFC 9420 or how to scale end-to-end encryption with Messaging Layer Security | Friday | Sch...
Today at #37c3, 3:45pm, Konrad and I will give a talk in hall Zuse about Messaging Layer Security (MLS).
They call it RFC 9420, we say MLS: A new IETF standard for end-to-end encryption, bringing improvements in performance and security.
👉 fahrplan.events.ccc.de/congress/202...
29.12.2023 12:25
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@julianmair.com will be buzzing through the corridors and can be reached via DECT at 4109. If you want to talk about secure messaging or E2EE, let us know!
26.12.2023 13:37
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Picture from the train with a computer on the table with an open presentation: "RFC 9420 - or how to scale end-to-end encryption with Messaging Layer Security (MLS)".
We are very excited to be at #37c3 in Hamburg after a long pandemic break. On day 3 (29.12., 3:45pm), @raphaelrobert.bsky.social and Konrad will give a talk on “RFC 9420 – or how to scale end-to-end encryption with Messaging Layer Security (MLS)”
👉 fahrplan.events.ccc.de/congress/202...
26.12.2023 13:36
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On the privacy of push notifications
Push notifications are a mechanism through which applications can send and display notifications to users of smartphones. The infrastructure that drives these notifications in the background is a comp...
After @netzpolitik.org’s recent investigation into surveillance through push notifications, many people have been concerned about how their own privacy is affected when using messengers anonymously.
In this blog post we examined the problem and what to do about it. Check it out 👇
20.12.2023 15:49
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On the privacy of push notifications
Push notifications are a mechanism through which applications can send and display notifications to users of smartphones. The infrastructure that drives these notifications in the background is a comp...
Check out our blog post where we examine the push notification problem and address potential misconceptions!
In the wake of recent reports on surveillance via push notifications, many people have been confused about it and how it affects their own privacy when using messengers anonymously.
20.12.2023 11:01
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First impactful measure following last week's splash about push notification surveillance:
www.reuters.com/technology/a...
13.12.2023 14:01
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Let's make this crystal clear: If you think you are anonymous because you
- used a throwaway number for Signal
- picked a completely random username for Wire/Matrix
- were given a random username with Threema/Session
YOU ARE NOT! You can be identified by the push tokens.
07.12.2023 09:48
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RFC 9420 aka Messaging Layer Security (MLS) - An Overview
Messaging Layer Security has been published. MLS is the first standardized, fully specified, freely accessible end-to-end encryption protocol.
These contributions from academia have been particularly useful in mitigating security issues before deploying in production environments.
New to MLS?
Check out our blog post for a high-level overview of MLS, its practical applications, and why it matters.
06.12.2023 08:55
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