Welcome to the Secure Messaging Summit!

Find me in github, IACR and EFF!

This is a summit inspired by the OTRv4 summit held last year. It is a summit where people from different places (academia, industry, open source implementations, and legal perspectives) talk about the latest problems and advancements on the secure messaging sphere.

This form takes inspiration from the pl-hci-school-2020 organized by Sarah Chasins, Elena Glassman, Shriram Krishnamurthi and Hila Peleg, and by the Fourteenth Algorithmic Number Theory Symposium, ANTS-XIV organized by Steven Galbraith.


The event will be entirely virtual.

The summit will run over two days, on the first week of September: the 3rd and 4th of September. It’ll end up being centered around times convenient to the morning in the Americas, the afternoon in Europe and Africa, and the evening in Western Asia. We are very sorry with the people from Central, East, South, Southeast, North Asia and the Australian continent. The next edition will prioritize the times for those places.

The times, therefore, are:

After each session, there will be a time for socializing, if wanted.


The schedule for the 3rd will be (the times are on EDT and CEST):

EDT Time CEST Time Talks
8:45 - 9:00 14:45 - 15:00 Welcome!: Introduction and guidelines
9:00 - 9:45 15:00 - 15:45 ‘The Simulation Paradigm and Deniable Communications’ by Rosario Gennaro
9:45 - 10:30 15:45 - 16:30 ‘Resolving Concurrency in Group Ratcheting Protocols’ by Paul Rösler
10:30 - 11:15 16:30 - 17:15 ‘Messaging Layer Security (MLS)’ by Raphael Robert
11:15 - 12:00 17:15 - 18:00 ‘Mobile Private Contact Discovery’ by Daniel Kales
12:00 - 12:45 18:00 - 18:45 ‘How to Avoid Invisible Salamanders: Cryptographic Tools for Moderation in Encrypted Messaging’ by Thomas Ristenpart
12:45 - 13:30 18:45 - 19:30 ‘What user studies tell us about secure messaging?’ by Nikolas Unger
13:30 - 14:15~ 19:30 - 20:15~ Socializing time

The schedule for the 4th will be (the times are on EDT and CEST):

EDT Time CEST Time Activities
11:00 - 11:30 17:00 - 17:30 Welcome!: Introduction and guidelines
11:30 - 12:20 17:30 - 18:20 Initial statement by panelists
12:20 - 13:10 18:20 - 19:10 Open discussion
13:10 - 13:30 19:10 - 19:30 Open discussion with audience
13:30 - 14:30~ 19:30 - 20:30~ Socializing time


The list of confirmed speakers for the 3rd are:

The topics that they will present vary from deniability, message franking, group messaging, mobile private contact discovery, and concurrent ratcheting.

The list of confirmed participants on the panel for the 4th are:

The topics the panel will touch upon are: The ‘EARN IT’ bill, the increase of surveillance with covid-19 pandemic over messaging applications, the monopoly of companies creating messaging applications, the Hong Kong security law, and more. We will explore the challenges, threats and advantages that secure messaging faces on different regions of the world (Hong Kong, Tibet, Latin America and US) from a legal, political and even sociological perspective.

The panel will be recorded.

There are many great people in this area, and we’re sorry we can’t invite all of them. If this goes well, hopefully we’ll have more of them in the future!

The talks and panel might be recorded prior consent from the speakers.


How to Register

We have no idea how much demand there will be. We will provide a registration form starting from August.

Registration will open on the 10th of August and end on the 30 of August. Times for opening and closing registration will be on UTC-5.

Registration is free; but you must read and accept our Code of Conduct, and be aware of the SNAPL Friendly Environment Policy.

We require that every participant represent themselves by the name that they use for their professional work (this can be a pseudonym that they generally use for their professional work). No participant can impersonate another person.

Before you register

On the Internet, signing up is cheap. Showing up is hard. Check your calendar to make sure you’re free, and block off the dates: commit to participating before you sign up. Do not sign up until you’ve blocked out the dates in your calendar.

Nevertheless, we understand that things can change. If you have signed up but won’t be participating, let us know.

Registration form

To be provided on the 10th of August at 7:00 UTC-5. It will close on the 30 of August at 23:00 UTC-5.

Note that you have to provide a valid email address at registration, as subsequent communications regarding the event will be sent to that address.

There are two ways of registering:

  1. By using the google form
  2. By sending an email to, with the following information (* means mandatory):
    • Last Name*,
    • First Name*,
    • email address *,
    • affiliation/institution*,
    • In which time zone will you be during the summit (UTC),
    • The typed statement: ‘I confirm that I have read and agree to abide by the code of conduct of the event’ *.
    • The typed statement: ‘I confirm that I understand the SNAPL Friendly Environment Policy to be used at the event’ *.

You can send encrypted emails for registration and subsequent communications by using PGP. The public key of can be found here. The fingerprint is: 8D6F D710 7F9A 2EC7 9634  4A8D C83B FA0F BDDA 279F. If you send encrypted emails, first please either send your public key or upload it in a server where it can be publicly found.


What we will use

Who This Event is Not For

This isn’t a place for people to be exclusionary or for harassment. This event has a code of conduct and we’ll use the SNAPL Friendly Environment Policy.


This is nicely sponsored by NLnet.

You can be another sponsor if you like! ;)