Derek Perrin
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derekperrin.com
Derek Perrin
@derekperrin.com
36 followers 27 following 5 posts
PhD in Mathematics. Christchurch, New Zealand. Studied isogenies. Mastodon: @derekperrin@mathstodon.xyz
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Reposted by Derek Perrin
andreavbasso.bsky.social
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...
June 10, 2025 at 3:58 PM
derekperrin.com
I'm thrilled to share that I successfully defended my PhD thesis titled "Isogeny graphs with level structure."
September 7, 2025 at 11:18 PM
Reposted by Derek Perrin
albertel.bsky.social
Black swan closely watches its young cygnet eating.

#birb #newzealand
A black swan (black feathers and a red bill with a white stripe) and a tiny cygnet floating in water. The adult looks at the small cygnet.
September 4, 2025 at 7:04 AM
Reposted by Derek Perrin
bsky.defeo.lu
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!
bsky.defeo.lu Luca De Feo @bsky.defeo.lu · Mar 13
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!
Cathedral of La Seu Vella in Lleida
April 25, 2025 at 2:14 PM
derekperrin.com
I'm excited to share that my first research paper,
"Ordinary isogeny graphs with level structure,"
has been published in the Canadian Mathematical Bulletin!
This marks a huge milestone in my research journey.

🔗 doi.org/10.4153/s000...
Ordinary isogeny graphs with level structure | Canadian Mathematical Bulletin | Cambridge Core
Ordinary isogeny graphs with level structure
doi.org
April 19, 2025 at 2:21 AM
derekperrin.com
In this paper we look at the structure of isogeny volcanoes with an added level structure.
arxiv-math-nt.bsky.social arxiv math.NT @arxiv-math-nt.bsky.social · Nov 6
Derek Perrin, Jos\'e Felipe Voloch
Ordinary Isogeny Graphs with Level Structure
https://arxiv.org/abs/2411.02732
November 14, 2024 at 11:07 AM
Reposted by Derek Perrin
eprint.ing.bot
CSIDH with Level Structure (Steven D. Galbraith, Derek Perrin, José Felipe Voloch) ia.cr/2023/1726
Abstract. We construct a new post-quantum cryptosystem which consists of enhancing CSIDH and similar cryptosystems by adding a full level N structure. We discuss the size of the isogeny graph in this new cryptosystem which consists of components which are acted on by the ray class group for the modulus N. We conclude by showing that, if we can efficiently find rational isogenies between elliptic curves, then we can efficiently find rational isogenies that preserve the level structure. We show that one can reduce the group action problem for the ray class group to the group action problem for the ideal class group. This reduces the security of this new cryptosystem to that of the original one
November 13, 2023 at 6:00 AM
Reposted by Derek Perrin
bdowney.bsky.social
#Mincup2023

It's time for next level Zircon Love!

@mineralcup.bsky.social investigated Zircon's semi-final win, and discovered heavy BLM voting and a bunch of organic votes from around the world. Much of this? 40 people in a Zircon hype telegram.

#teamzircon hype: t.me/+naPu0wNlAYc...
Zircon: HYPE!
t.me
October 1, 2023 at 1:17 AM