And we also have a QROM proof!

New PRISM improvements 🥳 We extended our PRISM paper to present two new variants: one that achieves strong unforgeability, and another that allows for smaller parameters and therefore faster signatures! eprint.iacr.org/2026/443.pdf

📢📢📢 𝐌𝐚𝐆𝐈𝐂 𝟐𝟎𝟐𝟔 𝐌𝐚𝐫𝐜𝐡𝐞 𝐖𝐨𝐫𝐤𝐬𝐡𝐨𝐩 𝐨𝐧 𝐆𝐫𝐨𝐮𝐩 𝐀𝐜𝐭𝐢𝐨𝐧𝐬 𝐢𝐧 𝐂𝐫𝐲𝐩𝐭𝐨𝐠𝐫𝐚𝐩𝐡𝐲 In May 5-8, let's all gather together to speak about Group Actions! Early registration until March 8! Organized with Marco Baldi, @bsky.defeo.lu, @giacomoborin.bsky.social, @andreavbasso.bsky.social magic-workshop.github.io

The IACR board sent a survey to members last year, and it took us a while to analyze the results and publish findings. You can see them at iacr.org/surveyresults/

Catch up on last weeks Isogeny Club talk! We welcomed Eli Orvis who taught us about abstract isogeny graphs: www.youtube.com/watch?v=Gzcc...

Last week at The Isogeny Club we had a great talk by Sebastian Spindler about modular curves! Check it out here: www.youtube.com/watch?v=EDU7... Be sure to join us again next Tuesday at the usual time :) isogeny.club

The Isogeny Club Season 7 starts today! At 5pm CEST, Bruno Sterner will talk about finding large smooth twins from short lattice vectors. More details at isogeny.club

Announcing The Isogeny Problems! A curated list of the seven foremost unsolved problems in isogeny-based cryptography. Solving one of these profound questions would mark a monumental advance, and as a resolver you'd get eternal honor and epic rewards! Full list: isogeni.es/problems

And you solve the failure rate problem, which was a big source of trouble in the previous implementation. And the new algorithm is simpler to implement! So very exciting result! (Although I had been spoiled already by @jonathan.isogeny.club talk at Bordeaux in May :))

TL;DR: we solve norm equations in a better way and get around a 2x improvement to IdealToIsogeny routines crucial in both SQIsign and PRISM.

Evaluation of Modular Polynomials from Supersingular Elliptic Curves (Maria Corte-Real Santos, Jonathan Komada Eriksen, Antonin Leroux, Michael Meyer, Lorenz Panny) ia.cr/2025/1154

Registration for the Leuven Isogeny Days 6 is now open! 📅 10–12 Sept 2025 @ KU Leuven Morning: research talks Afternoon: brainstorming sessions More info: www.esat.kuleuven.be/cosic/projec... #isogeny #isocrypt #erc #postquantum

We (finally) published all the material from this course on SQIsign, including lecture slides and exercise sheets for the Sage laboratory. Available here: github.com/andreavico/S...

Registrations for the Decrypting Diversity Summit are open: decryptingdiversity.com/registration/ The event's focus is to develop actions to better support underrepresented groups in cryptography while showcasing the exceptional career paths and research contributions of these communities.

🥇The paper "PRISM: Simple And Compact Identification and Signatures From Large Prime Degree Isogenies", co-authored by COSIC, has won the best paper award at @IACR_News #PKC 2025 in Røros, Norway. #pkc2025 Link: link.springer.com/chapter/10.1...

The SQIparty starts on Monday, but it's still time to register! We prepared an exciting program for you with a balanced mix of talks, coding sprints, skillshares and other activities! www.cig.udl.cat/SQIparty2025... See you in Lleida!

The mystery guest and myself have made it to Paris! Next stop, Barcelona!

As a surprise for everyone attending, we will even have a mystery guest joining us as well, who you don't want to miss! In fact, we have already started the train journey from Leuven! Curious about the mystery guest? Well, what are you waiting for, sign up and find out next weekend!

Season 6 of the Isogeny Club is officially done! You can catch up with all the talks here: isogeny.club If, like us, you haven't had enough isogenies for the term, be sure to join us at the Brainstorm Sessions affiliated with Eurocrypt: isogeny.club/eurocrypt

Really excited to share the Decrypting Diversity Summit happening in Montpellier, France from 17-20 June! The goal of the summit is to promote diversity, inclusivity, and gender equality within the cryptography community. For more info: decryptingdiversity.com

Registration is now open! www.cig.udl.cat/SQIparty2025...

Lleida is very well connected by train to Barcelona (1 hour) and to Madrid (2 hours). Ideal to get acclimated to tapas before going to Eurocrypt and to the Isogeny brainstorm! isogeny.club/eurocrypt bsky.app/profile/icas...

Fancy some isogeny crypto? Join us for a 3-day workshop on isogeny-based cryptography in Lleida, Catalonia, April 28-30 www.cig.udl.cat/icrypto2025_... Brought to you by ULleida's Cryptography+Graphs group, the SQIsign team and friends! Registration and program coming soon Registration is free!

Next week (Tuesday 5pm CET) at The Isogeny Club we'll have Laurane Marco (EPFL) who will talk to us about computing modular polynomials modulo a generic prime! More details at isogeny.club

The wait is finally over! Flowers are slowly blooming, birds are chiriping, and the Isogeny Club season 6 is about to start! Join us next Tuesday, February 25th at 17:00 CET, when Abel Laval will introduce us to a brand new analogue of the KLPT algorithm in dimension two! 🥳 isogeny.club

Absolutely thrilled for season six of the Isogeny Club (isogeny.club) starting February 25th by a talk by Abel Laval!

Really excited to finally share PRISM, a new isogeny-based signature 🥳 joint work with lots of awesome people. eprint.iacr.org/2025/135

As a Christmas gift for everyone, we have one exciting final talk of this season! Join the #isogenyclub next Tuesday (17th Dec), where Sina Schaeffler will talk about constant-time lattice reduction for SQIsign. More info at isogeny.club

Are you attending Asiacrypt2024? If you are a women-in-cryptography, you can participate in our coffee breaks: docs.google.com/forms/d/e/1F... We will match you with someone and you can grab a coffee/tea in person!

Did you hear the news? There’s a new isogeny-based signature scheme on the block! Join the #isogenyclub next Tuesday (3rd Dec), where Riccardo Invernizzi will introduce us to PRISM. More info at isogeny.club

Having fixed most issues, isogeni.es should be up and running now. Perhaps useful for others too! (it simply scrapes recent isogeny papers from ePrint, and formats these nicely)