Lúcás Meier's Avatar

Lúcás Meier

@cronokirby.com

Cryptographer working on Penumbra Cryptography, FP, Math, and other cool stuff. Blog too infrequently at cronokirby.com Lost in Seattle somewhere

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10.04.2023
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Latest posts by Lúcás Meier @cronokirby.com

What if you allow co-induction, and don't require termination, but merely productivity?

It should be easy to show that your DFS continues to do meaningful work, in that it won't visit old nodes again

01.08.2025 23:36 👍 4 🔁 0 💬 0 📌 0

You can replicate the STROBE API with many other primitives, it's just less efficient. STROBE is a nice API over the capabilities of a Duplex construction, and so emulating that with other means is awkward.

28.07.2025 18:32 👍 1 🔁 0 💬 1 📌 0

Compare the number of the calls to the compression function vs the duplex construction

28.07.2025 18:17 👍 1 🔁 0 💬 1 📌 0

I still don't quite get the motivation for keeping Alaskan as a through street, if the motivation was ferry access. As a result, the vast majority of the people on Alaskan are just avoiding the toll tunnel.

23.07.2025 18:17 👍 2 🔁 0 💬 1 📌 0

A couple issues with this theory:
- there's often a myopic focus on impact during construction (traffic theory of everything)
- preference seems to be doled out through restrictions of upzoning, which reduces land value (but, it can preserve property value, sometimes)

23.07.2025 18:14 👍 0 🔁 0 💬 0 📌 0

"But do we actually know that"

18.07.2025 14:35 👍 0 🔁 0 💬 1 📌 0

Yeah, formalizing that is difficult. Intuitively, something akin to a game-theoretic interpretation of logic would work.
That's way too much machinery for this book though.

17.07.2025 17:02 👍 0 🔁 0 💬 1 📌 0

I think the conundrum is also solved in theory by not being content with "mere existence" but rather interpreting "exists" in a constructive way. I.e. if someone says that an algorithm exists finding a collision in SHA3, they should give it to you

17.07.2025 15:55 👍 3 🔁 0 💬 1 📌 0

I can barely write a background section in 20 pages

16.07.2025 15:51 👍 1 🔁 0 💬 1 📌 0

kingcounty.gov/en/dept/asse...

It's budget / mill based, so a drop in property values would just change the distribution of taxation, not the intake.

10.07.2025 17:05 👍 2 🔁 0 💬 1 📌 0
Preview
How to Abuse and Fix Authenticated Encryption Without Key Commitment Authenticated encryption (AE) is used in a wide variety of applications, potentially in settings for which it was not originally designed. Recent research tries to understand what happens when AE is n...

eprint.iacr.org/2020/1456

This paper made me see it as a bit more of an interesting attack, in that they actually found examples of a ciphertext which would decrypt to two valid files with different keys.

It does remain a bit contrived to imagine key confusion, but software can be very buggy.

07.07.2025 16:59 👍 2 🔁 0 💬 0 📌 0

If you use the sales tax to fund addiction treatment, surely that makes it highly progressive, no?

01.07.2025 16:03 👍 0 🔁 0 💬 0 📌 0

Not yet afaict

24.06.2025 17:02 👍 0 🔁 0 💬 1 📌 0
Chat Folders on Signal Android With chat folders you can separate chat threads into folders that can be switched via tabs in the chat list. This can be useful for grouping chats together into a work folder, friend folder, or unr...

support.signal.org/hc/en-us/art... One folders are more widespread that can help, + not needing to share your phone number to connect

23.06.2025 16:52 👍 3 🔁 1 💬 1 📌 0

i am so sorry but if you live in the pnw you have no business having palm trees in your yard

23.06.2025 16:35 👍 1 🔁 1 💬 0 📌 0

Well, at least it has sidewalks at all!

12.06.2025 18:53 👍 1 🔁 0 💬 0 📌 0

There's also an extent to which, for a strong property, it can obviously eliminate many programs because it's clear that it doesn't hold, but for weaker properties, there's still a chance it will in some weird way.

11.06.2025 20:12 👍 2 🔁 0 💬 0 📌 0

I don't think it's a contradiction, because proving weaker properties, contingent on all the edge cases not eliminated by something stronger, actually involves proving more.

11.06.2025 20:10 👍 1 🔁 0 💬 1 📌 0
Bridging, Risk, and Buck Passing Bridges enable users to transfer assets between blockchains.

notes.cronokirby.com/Posts/Bridgi...

I wrote a short blog post about how I'd like to see us evolve bridges towards internalizing risk, rather than passing it on to users. Ideally, bridging risk should not be mitigated by having users be aware of each bridging action, gauging it themselves.

10.06.2025 03:58 👍 2 🔁 1 💬 0 📌 0
pug in a kayak

pug in a kayak

pugs hair in the wind in a kayak

pugs hair in the wind in a kayak

Tired pug

Tired pug

pug kayak -> pug sleep

09.06.2025 04:28 👍 5 🔁 1 💬 0 📌 0

It's called "urban planning" and it's a science

21.05.2025 06:27 👍 3 🔁 0 💬 0 📌 0

"Cryptography makes everything a key management problem" is actually a profoundly optimistic statement.

20.05.2025 00:05 👍 13 🔁 5 💬 1 📌 0

This is incredible! I'm seething with jealousy.

18.05.2025 20:11 👍 1 🔁 0 💬 0 📌 0

Typography is one of the world's most pernicious infohazards.

12.05.2025 18:31 👍 3 🔁 0 💬 0 📌 0

Cities being purely "profit"-oriented is probably not ideal, but we also want decision makers in cities to actually like the idea of their city being an increasingly desirable place to live with more and more residents!

08.05.2025 04:09 👍 1 🔁 0 💬 0 📌 0

The combination of these factors lead to a city looking at a vacant lot in the middle of a growing neighborhood and thinking (as a collective hive-mind) "man, this would be a gigantic hassle to develop" instead of "look how much value (money) we could get by improving this neighborhood"

08.05.2025 04:09 👍 0 🔁 0 💬 1 📌 0

Beyond these elements, property valuation is completely out of wack, often being very out of date, inconsistently applied, etc. There's also the Georgist gripe about property and not only land being taxed. Cities are also exempt from property taxes (at least, in WA, c.f. RCW 84.36.010)

08.05.2025 04:07 👍 0 🔁 0 💬 1 📌 0

Often, there are strong legal barriers in place to prevent this absolute value from rising too quickly over the years.

This can make cities not interested in growing the value of their land though.

08.05.2025 04:04 👍 2 🔁 0 💬 1 📌 0

This is often not well understood, but in most places in the US, property taxes are determined not by a fixed rate, but rather by figuring out how much the locality (city, state government, county, etc.) needs to collect, as an absolute value, which then determines the rate.

08.05.2025 04:03 👍 2 🔁 0 💬 1 📌 0

Considering this article (www.slowboring.com/p/what-citie...) from @mattyglesias.bsky.social about how the concentrated ownership model can help neighborhoods (as it does for, e.g. Theme Parks, Japanese Rail), I'm starting to think that cities having constant millage is bad.

08.05.2025 04:02 👍 0 🔁 0 💬 1 📌 0