Franziskus
@franziskuskiefer.de
🔐 High Assurance Dad @cryspen.com
Reposted by Franziskus
This week in COSIC... Finally our PQCSA event in Frankfurt is happening! The workshop on "PQC Migration & Supply Chain Readiness for the Automotive Industry" will take place on Friday.
www.esat.kuleuven.be/cosic/events...
www.esat.kuleuven.be/cosic/events...
November 3, 2025 at 4:03 PM
This week in COSIC... Finally our PQCSA event in Frankfurt is happening! The workshop on "PQC Migration & Supply Chain Readiness for the Automotive Industry" will take place on Friday.
www.esat.kuleuven.be/cosic/events...
www.esat.kuleuven.be/cosic/events...
Reposted by Franziskus
The `hax` engine from @cryspen.com, originally written in OCaml, is gradually being rewritten in Rust :D
Oh also they have a Lean backend now :D
Oh also also you can use Lean to specify properties on your Rust code now : D
hax.cryspen.com/blog/
Oh also they have a Lean backend now :D
Oh also also you can use Lean to specify properties on your Rust code now : D
hax.cryspen.com/blog/
Blog - hax
hax.cryspen.com
October 9, 2025 at 5:11 PM
The `hax` engine from @cryspen.com, originally written in OCaml, is gradually being rewritten in Rust :D
Oh also they have a Lean backend now :D
Oh also also you can use Lean to specify properties on your Rust code now : D
hax.cryspen.com/blog/
Oh also they have a Lean backend now :D
Oh also also you can use Lean to specify properties on your Rust code now : D
hax.cryspen.com/blog/
Reposted by Franziskus
Trotz des immensen möglichen Schadens der #Chatkontrolle für Meinungsfreiheit, Pressefreiheit, Privatsphäre, Demokratie und IT-Sicherheit ist das Thema medial derzeit noch ganz schön unterberichtet. Hier steht, um was es eigentlich geht: netzpolitik.org/2025/fragen-...
Fragen und Antworten: Warum ist Chatkontrolle so gefährlich für uns alle?
Die Chatkontrolle gilt weithin als Ende der verschlüsselten und privaten Kommunikation, also als Gefahr für die Demokratie und technisches Sicherheitsrisiko für die digitale Welt. Wir erklären und kom...
netzpolitik.org
October 6, 2025 at 5:45 AM
Trotz des immensen möglichen Schadens der #Chatkontrolle für Meinungsfreiheit, Pressefreiheit, Privatsphäre, Demokratie und IT-Sicherheit ist das Thema medial derzeit noch ganz schön unterberichtet. Hier steht, um was es eigentlich geht: netzpolitik.org/2025/fragen-...
Reposted by Franziskus
Submissions for RWC 2026 are open now!
Real World Crypto (RWC) is an annual event where cryptographers and security engineers can exchange ideas and results on the use of cryptography in mainstream applications.
buff.ly/0PoLe2D
Real World Crypto (RWC) is an annual event where cryptographers and security engineers can exchange ideas and results on the use of cryptography in mainstream applications.
buff.ly/0PoLe2D
RWC 2026
Real World Crypto Symposium
rwc.iacr.org
September 18, 2025 at 9:02 AM
Submissions for RWC 2026 are open now!
Real World Crypto (RWC) is an annual event where cryptographers and security engineers can exchange ideas and results on the use of cryptography in mainstream applications.
buff.ly/0PoLe2D
Real World Crypto (RWC) is an annual event where cryptographers and security engineers can exchange ideas and results on the use of cryptography in mainstream applications.
buff.ly/0PoLe2D
Reposted by Franziskus
I'm hiring at the EF: jobs.lever.co/ethereumfoun...
If you're into Ethereum, cryptography, and formal verification, please get in touch! 🙂
If you're into Ethereum, cryptography, and formal verification, please get in touch! 🙂
Ethereum Foundation - Researcher/Engineer (Formal Verification)
Role summary As a member of the Protocol Snarkification team, you will work towards snarkifying Ethereum by working to specify and verify the core cryptographic components of proof systems and their i...
jobs.lever.co
August 8, 2025 at 12:46 PM
I'm hiring at the EF: jobs.lever.co/ethereumfoun...
If you're into Ethereum, cryptography, and formal verification, please get in touch! 🙂
If you're into Ethereum, cryptography, and formal verification, please get in touch! 🙂
Reposted by Franziskus
As of today, XMTP is now a fully quantum-resistant decentralized messaging protocol.
This means, any developer, anywhere in the world can leverage XMTP to provide their users with private, decentralized, & quantum-resistant messaging.
This means, any developer, anywhere in the world can leverage XMTP to provide their users with private, decentralized, & quantum-resistant messaging.
July 10, 2025 at 3:26 PM
As of today, XMTP is now a fully quantum-resistant decentralized messaging protocol.
This means, any developer, anywhere in the world can leverage XMTP to provide their users with private, decentralized, & quantum-resistant messaging.
This means, any developer, anywhere in the world can leverage XMTP to provide their users with private, decentralized, & quantum-resistant messaging.
Reposted by Franziskus
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.
If you’re interested in joining our team, please apply today!
For friends of secure messaging 🥷, please share our post with potential candidates.
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.
join.com
May 15, 2025 at 9:51 AM
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.
If you’re interested in joining our team, please apply today!
For friends of secure messaging 🥷, please share our post with potential candidates.
Reposted by Franziskus
Interessante Studie der TU Dresden! Ganz besonders für Xhain fällt mal wieder auf: "In Friedrichshain-Kreuzberg hat das Auto einen Anteil von acht Prozent". Hier findet Ihr auch die Mobi-Daten zu den einzelnen Bezirken: www.berlin.de/sen/uvk/mobi...
www.berliner-zeitung.de/mensch-metro...
www.berliner-zeitung.de/mensch-metro...
Studie zum Verkehr in Berlin: So stark geht die Bedeutung des Autos zurück
Neue Mobilitätsstudie mit interessanten Resultaten: Der erwartete Fahrradboom bleibt aus. Dafür kommt eine oft unterschätzte Fortbewegungsart auf Platz eins.
www.berliner-zeitung.de
April 8, 2025 at 4:54 PM
Interessante Studie der TU Dresden! Ganz besonders für Xhain fällt mal wieder auf: "In Friedrichshain-Kreuzberg hat das Auto einen Anteil von acht Prozent". Hier findet Ihr auch die Mobi-Daten zu den einzelnen Bezirken: www.berlin.de/sen/uvk/mobi...
www.berliner-zeitung.de/mensch-metro...
www.berliner-zeitung.de/mensch-metro...
Reposted by Franziskus
New blog post! 📝 Control flow analysis with Hax. In this post we show how to ensure control flow properties such as "function A is always called before function B" in Rust. Super relevant for security! 🔒
buff.ly/ntTW299
#rustlang #formalverification #security
buff.ly/ntTW299
#rustlang #formalverification #security
Control flow analysis with hax
A difficulty of formal verification is that specifying programs can be hard. Certain kinds of programs can end up having a specification that is as complex as the code itself. In this case it is…
buff.ly
March 27, 2025 at 7:04 AM
New blog post! 📝 Control flow analysis with Hax. In this post we show how to ensure control flow properties such as "function A is always called before function B" in Rust. Super relevant for security! 🔒
buff.ly/ntTW299
#rustlang #formalverification #security
buff.ly/ntTW299
#rustlang #formalverification #security
Reposted by Franziskus
Fun Fact for the day - with Google and CloudFlare pushing hybrid post-quantum key exchange by default, and with chrome and Firefox supporting it by default since December, around 1/3 of the total traffic we are analysing w/CryptoMon from regular operations is now PQC secured by default! 🚀
March 18, 2025 at 12:18 PM
Fun Fact for the day - with Google and CloudFlare pushing hybrid post-quantum key exchange by default, and with chrome and Firefox supporting it by default since December, around 1/3 of the total traffic we are analysing w/CryptoMon from regular operations is now PQC secured by default! 🚀
Reposted by Franziskus
Exciting to see MLS gaining traction! 🚀 This increased adoption is a huge win for security and privacy in messaging.
#MLS #Security #Privacy #XMTP #OpenMLS
#MLS #Security #Privacy #XMTP #OpenMLS
Privacy is under attack.
🇬🇧 The UK made Apple drop ADP.
🇮🇳 India forced a backdoor to WhatsApp.
🇷🇺 Russia & 🇹🇷 Turkey banned Discord.
Centralized systems are breaking down & encryption is not enough.
We need decentralized messaging.
1/7
🇬🇧 The UK made Apple drop ADP.
🇮🇳 India forced a backdoor to WhatsApp.
🇷🇺 Russia & 🇹🇷 Turkey banned Discord.
Centralized systems are breaking down & encryption is not enough.
We need decentralized messaging.
1/7
March 15, 2025 at 8:34 AM
Reposted by Franziskus
Come join us at the SPIQE workshop in Munich in June! spiqe-workshop.github.io - we are now open for paper submissions and talk proposals on all aspects of secure protocol implementation for the post-quantum era.
Secure Protocol Implementations in the Quantum Era (SPIQE)
Secure Protocol Implementations in the Quantum Era (SPIQE)
spiqe-workshop.github.io
February 28, 2025 at 3:38 PM
Come join us at the SPIQE workshop in Munich in June! spiqe-workshop.github.io - we are now open for paper submissions and talk proposals on all aspects of secure protocol implementation for the post-quantum era.
Reposted by Franziskus
20.01.25: A milestone for IT security: Contract by @CybAgBund with 5 partners for the "Trustworthy IT Ecosystem" (ÖvIT) research program.
Aim: Proven IT security and a global network of experts.
#ÖvIT #Cybersecurity #FormalVerification #Inno...
weiterlesen
Aim: Proven IT security and a global network of experts.
#ÖvIT #Cybersecurity #FormalVerification #Inno...
weiterlesen
January 20, 2025 at 11:31 AM
20.01.25: A milestone for IT security: Contract by @CybAgBund with 5 partners for the "Trustworthy IT Ecosystem" (ÖvIT) research program.
Aim: Proven IT security and a global network of experts.
#ÖvIT #Cybersecurity #FormalVerification #Inno...
weiterlesen
Aim: Proven IT security and a global network of experts.
#ÖvIT #Cybersecurity #FormalVerification #Inno...
weiterlesen
We launched pq.cryspen.com.
Test your PQC readiness now! Our new website, featuring our formally verified libcrux crypto library, makes it easy to see if your browser is future-proof.
Head over to https://buff.ly/4ak1LB6 to test your browser and learn more about post-quantum cryptography.
#postquantumcrypto #cryptography
Head over to https://buff.ly/4ak1LB6 to test your browser and learn more about post-quantum cryptography.
#postquantumcrypto #cryptography
January 14, 2025 at 10:40 AM
We launched pq.cryspen.com.
Reposted by Franziskus
Cryspen is looking for a talented Proof Engineer to join our team in Germany or France! 🇫🇷🇩🇪
Cryspen is on a mission to build high-assurance software and formal verification tools that make the world a safer place.
https://buff.ly/4jeEJiN
#ProofEngineering #Hiring
Cryspen is on a mission to build high-assurance software and formal verification tools that make the world a safer place.
https://buff.ly/4jeEJiN
#ProofEngineering #Hiring
Jobs
Work with us
buff.ly
January 13, 2025 at 9:56 AM
Cryspen is looking for a talented Proof Engineer to join our team in Germany or France! 🇫🇷🇩🇪
Cryspen is on a mission to build high-assurance software and formal verification tools that make the world a safer place.
https://buff.ly/4jeEJiN
#ProofEngineering #Hiring
Cryspen is on a mission to build high-assurance software and formal verification tools that make the world a safer place.
https://buff.ly/4jeEJiN
#ProofEngineering #Hiring
Reposted by Franziskus
Eine kleine Weihnachtsgeschichte
Vor 20 Jahren verliert Friedrich Merz seinen Laptop. Es wird gefunden und zurückgegeben, von einem Obdachlosen. Friedrich Merz bedankt sich, indem er ihm ein Geschenk überbringen lässt. Sein Buch - signiert.
Wählt nicht Friedrich Merz!
Vor 20 Jahren verliert Friedrich Merz seinen Laptop. Es wird gefunden und zurückgegeben, von einem Obdachlosen. Friedrich Merz bedankt sich, indem er ihm ein Geschenk überbringen lässt. Sein Buch - signiert.
Wählt nicht Friedrich Merz!
Friedrich Merz und der Obdachlose: Notebook gefunden, Sympathie verloren
Vor 14 Jahren verlor Friedrich Merz seinen Laptop an einem Taxistand. Sein Glück: Ein ehrlicher Finder gab das Gerät zurück. Jetzt äußerte sich der Mann in einem "taz"-Interview über Merz' "unverschäm...
www.spiegel.de
December 26, 2024 at 7:59 AM
Eine kleine Weihnachtsgeschichte
Vor 20 Jahren verliert Friedrich Merz seinen Laptop. Es wird gefunden und zurückgegeben, von einem Obdachlosen. Friedrich Merz bedankt sich, indem er ihm ein Geschenk überbringen lässt. Sein Buch - signiert.
Wählt nicht Friedrich Merz!
Vor 20 Jahren verliert Friedrich Merz seinen Laptop. Es wird gefunden und zurückgegeben, von einem Obdachlosen. Friedrich Merz bedankt sich, indem er ihm ein Geschenk überbringen lässt. Sein Buch - signiert.
Wählt nicht Friedrich Merz!
Reposted by Franziskus
Great talks, great community. Join us Wednesday.
📆 December 4
🕖 From 19:00 to 22:00
📍 Secure Systems Engineering GmbH
Hauptstraße 3
10827 Berlin
www.eventbrite.de/e/berlin-cry...
📆 December 4
🕖 From 19:00 to 22:00
📍 Secure Systems Engineering GmbH
Hauptstraße 3
10827 Berlin
www.eventbrite.de/e/berlin-cry...
Berlin Crypto December 2024
Where the Berlin Crypto Community gets together.
www.eventbrite.de
December 2, 2024 at 11:17 AM
Great talks, great community. Join us Wednesday.
📆 December 4
🕖 From 19:00 to 22:00
📍 Secure Systems Engineering GmbH
Hauptstraße 3
10827 Berlin
www.eventbrite.de/e/berlin-cry...
📆 December 4
🕖 From 19:00 to 22:00
📍 Secure Systems Engineering GmbH
Hauptstraße 3
10827 Berlin
www.eventbrite.de/e/berlin-cry...
Reposted by Franziskus
📣 Upcoming Event!
Our next Berlin Crypto Meetup is coming up! We've got two great talks lined up.
Be part of the growing Berlin crypto community.
📆 December 4
🕖 From 19:00 to 22:00
📍 Secure Systems Engineering GmbH
Hauptstraße 3
10827 Berlin
www.eventbrite.de/e/berlin-cry...
Our next Berlin Crypto Meetup is coming up! We've got two great talks lined up.
Be part of the growing Berlin crypto community.
📆 December 4
🕖 From 19:00 to 22:00
📍 Secure Systems Engineering GmbH
Hauptstraße 3
10827 Berlin
www.eventbrite.de/e/berlin-cry...
Berlin Crypto December 2024
Where the Berlin Crypto Community gets together.
www.eventbrite.de
November 7, 2024 at 7:02 AM
📣 Upcoming Event!
Our next Berlin Crypto Meetup is coming up! We've got two great talks lined up.
Be part of the growing Berlin crypto community.
📆 December 4
🕖 From 19:00 to 22:00
📍 Secure Systems Engineering GmbH
Hauptstraße 3
10827 Berlin
www.eventbrite.de/e/berlin-cry...
Our next Berlin Crypto Meetup is coming up! We've got two great talks lined up.
Be part of the growing Berlin crypto community.
📆 December 4
🕖 From 19:00 to 22:00
📍 Secure Systems Engineering GmbH
Hauptstraße 3
10827 Berlin
www.eventbrite.de/e/berlin-cry...
Reposted by Franziskus
When implementing cryptographic protocols, ensuring input validation is paramount. Neglecting this can lead to severe vulnerabilities.
In a recent blog post, Jan delved into how we address input validation in OpenMLS, an open-source Rust implementation of the MLS protocol.
In a recent blog post, Jan delved into how we address input validation in OpenMLS, an open-source Rust implementation of the MLS protocol.
Taking Stock of Validation Checks
When implementing cryptographic protocols, probably the most important thing is to not forget validating all inputs. Failing to do so can lead to inadvertant leakage of private information, state…
buff.ly
October 1, 2024 at 6:00 AM
When implementing cryptographic protocols, ensuring input validation is paramount. Neglecting this can lead to severe vulnerabilities.
In a recent blog post, Jan delved into how we address input validation in OpenMLS, an open-source Rust implementation of the MLS protocol.
In a recent blog post, Jan delved into how we address input validation in OpenMLS, an open-source Rust implementation of the MLS protocol.
Reposted by Franziskus
We're looking forward to seeing y'all tonight.
Please ping us with any questions or last minute lightning talk ideas.
🕖 19:00
📍 Least Authority
Thaerstraße 28a
10249 Berlin
Please ping us with any questions or last minute lightning talk ideas.
🕖 19:00
📍 Least Authority
Thaerstraße 28a
10249 Berlin
September 23, 2024 at 6:00 AM
We're looking forward to seeing y'all tonight.
Please ping us with any questions or last minute lightning talk ideas.
🕖 19:00
📍 Least Authority
Thaerstraße 28a
10249 Berlin
Please ping us with any questions or last minute lightning talk ideas.
🕖 19:00
📍 Least Authority
Thaerstraße 28a
10249 Berlin
Reposted by Franziskus
Don't miss out on the Berlin Crypto Meetup.
Sign up now!
📆 September 23
🕖 From 19:00 to 21:00
📍 Least Authority
Thaerstraße 28a
10249 Berlin
www.berlin-crypto.de
- Sign up: forms.gle/Z7dLagdyZojQ...
- Lightning talks: forms.gle/LZdqmqwRdUij...
Sign up now!
📆 September 23
🕖 From 19:00 to 21:00
📍 Least Authority
Thaerstraße 28a
10249 Berlin
www.berlin-crypto.de
- Sign up: forms.gle/Z7dLagdyZojQ...
- Lightning talks: forms.gle/LZdqmqwRdUij...
Berlin Crypto
Join us for the relaunch of Berlin's Crypto Meetup!
After a four-year hiatus, we're excited to bring back this vibrant community event. Connect with like-minded individuals, explore the latest advance...
www.berlin-crypto.de
September 12, 2024 at 6:49 AM
Don't miss out on the Berlin Crypto Meetup.
Sign up now!
📆 September 23
🕖 From 19:00 to 21:00
📍 Least Authority
Thaerstraße 28a
10249 Berlin
www.berlin-crypto.de
- Sign up: forms.gle/Z7dLagdyZojQ...
- Lightning talks: forms.gle/LZdqmqwRdUij...
Sign up now!
📆 September 23
🕖 From 19:00 to 21:00
📍 Least Authority
Thaerstraße 28a
10249 Berlin
www.berlin-crypto.de
- Sign up: forms.gle/Z7dLagdyZojQ...
- Lightning talks: forms.gle/LZdqmqwRdUij...
Reposted by Franziskus
Berlin Crypto is Back!
After a four-year break, the Berlin Crypto Community is thrilled to reunite.
📆 September 23
🕖 From 19:00 to 21:00
📍 Least Authority
Thaerstraße 28a
10249 Berlin
Sign up for the meetup and submit your lightning talk
www.berlin-crypto.de
#BerlinCrypto #Cryptography #Meetup
After a four-year break, the Berlin Crypto Community is thrilled to reunite.
📆 September 23
🕖 From 19:00 to 21:00
📍 Least Authority
Thaerstraße 28a
10249 Berlin
Sign up for the meetup and submit your lightning talk
www.berlin-crypto.de
#BerlinCrypto #Cryptography #Meetup
Berlin Crypto
Join us for the relaunch of Berlin's Crypto Meetup!
After a four-year hiatus, we're excited to bring back this vibrant community event. Connect with like-minded individuals, explore the latest advance...
www.berlin-crypto.de
September 4, 2024 at 1:52 PM
Berlin Crypto is Back!
After a four-year break, the Berlin Crypto Community is thrilled to reunite.
📆 September 23
🕖 From 19:00 to 21:00
📍 Least Authority
Thaerstraße 28a
10249 Berlin
Sign up for the meetup and submit your lightning talk
www.berlin-crypto.de
#BerlinCrypto #Cryptography #Meetup
After a four-year break, the Berlin Crypto Community is thrilled to reunite.
📆 September 23
🕖 From 19:00 to 21:00
📍 Least Authority
Thaerstraße 28a
10249 Berlin
Sign up for the meetup and submit your lightning talk
www.berlin-crypto.de
#BerlinCrypto #Cryptography #Meetup
Reposted by Franziskus
Thrilled to share that we've teamed up with Google to create formally verified implementations of NIST's post-quantum algorithms. These open-source solutions will offer robust security guarantees, high performance, and are designed for widespread adoption.
bughunters.google.com/blog/6038863...
bughunters.google.com/blog/6038863...
Blog: Formally Verified Post-Quantum Algorithms
In our latest post on PQC, we discuss how we are partnering with Cryspen to produce formally verified implementations of the NIST-selected post-quantum algorithms.
bughunters.google.com
August 19, 2024 at 7:27 AM
Thrilled to share that we've teamed up with Google to create formally verified implementations of NIST's post-quantum algorithms. These open-source solutions will offer robust security guarantees, high performance, and are designed for widespread adoption.
bughunters.google.com/blog/6038863...
bughunters.google.com/blog/6038863...
Reposted by Franziskus
We’re proud to announce the hax playground! Inspired by the Rust Playground, the hax playground allows you to play with hax directly in your web browser! This provides a first glimpse at Cryspen’s upcoming verification workbench!
hax-playground.cryspen.com
More details: cryspen.com/post/announc...
hax-playground.cryspen.com
More details: cryspen.com/post/announc...
Announcing the hax Playground
Our Rust verification framework now has a web playground!
cryspen.com
August 14, 2024 at 9:28 AM
We’re proud to announce the hax playground! Inspired by the Rust Playground, the hax playground allows you to play with hax directly in your web browser! This provides a first glimpse at Cryspen’s upcoming verification workbench!
hax-playground.cryspen.com
More details: cryspen.com/post/announc...
hax-playground.cryspen.com
More details: cryspen.com/post/announc...
Reposted by Franziskus
Last week, at the National CyberSecurity Center of Excellence in Maryland, NIST hosted a workshop on Formal Methods within Certification Programs.
cryspen.com/post/fmcp/
cryspen.com/post/fmcp/
Cryspen @ FMCP 2024
We gave a talk at the NIST workshop on Formal Methods within Certification Programs.
cryspen.com
July 29, 2024 at 5:56 AM
Last week, at the National CyberSecurity Center of Excellence in Maryland, NIST hosted a workshop on Formal Methods within Certification Programs.
cryspen.com/post/fmcp/
cryspen.com/post/fmcp/