Nils Fleischhacker's Avatar

Nils Fleischhacker

@cryptomaeher

Cryptographer working on both applied and theoretical cryptography. Currently Assistant Professor for Cryptography at Ruhr University Bochum. Opinions probably someone else's. he/him

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03.07.2023
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Latest posts by Nils Fleischhacker @cryptomaeher

I'm so sorry you're all going to have to go through this. ๐Ÿ˜Ÿ

11.03.2026 11:26 ๐Ÿ‘ 2 ๐Ÿ” 0 ๐Ÿ’ฌ 2 ๐Ÿ“Œ 0

Note: this drop in attendance was attributed to two main factors.

(1) The impact of drastic cuts to science and research funding in the United States

(2) The fact that many non-US researchers don't feel safe visiting

The first sucks. The second disqualifies the US from ANY future consideration.

11.03.2026 09:52 ๐Ÿ‘ 13 ๐Ÿ” 7 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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Maybe I should reconsider my career in cake decorating. ๐Ÿค”

07.03.2026 16:17 ๐Ÿ‘ 2 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0

My physio: You should stop if something causes pain.
Also my physio: Does this hurt? Good, then we're hitting the right spot.

07.03.2026 07:43 ๐Ÿ‘ 3 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
Captain Haddock looking very frazzled, saying, โ€œWhat a week, huh?โ€
Tintin leans into the frame and says, โ€œCaptain, itโ€™s Wednesday.โ€
Snowy aka Milou is very excited about the drink he has found.

Viรฑeta de Tintin
El capitรกn Haddock, sentado a una mesa y con aspecto de estar agotado, dice: "ยกMenuda semana, ยฟeh?".
Tintรญn, a su derecha, le dice: "Capitรกn, es miรฉrcoles".
A la izquierda, Milรบ mira muy contento la bebida que estรก en la mesa.

Captain Haddock looking very frazzled, saying, โ€œWhat a week, huh?โ€ Tintin leans into the frame and says, โ€œCaptain, itโ€™s Wednesday.โ€ Snowy aka Milou is very excited about the drink he has found. Viรฑeta de Tintin El capitรกn Haddock, sentado a una mesa y con aspecto de estar agotado, dice: "ยกMenuda semana, ยฟeh?". Tintรญn, a su derecha, le dice: "Capitรกn, es miรฉrcoles". A la izquierda, Milรบ mira muy contento la bebida que estรก en la mesa.

04.03.2026 11:35 ๐Ÿ‘ 377 ๐Ÿ” 159 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 6
A depiction of significant air traffic squeezing through Azerbaijani air space to avoid Russia and Iran.

A depiction of significant air traffic squeezing through Azerbaijani air space to avoid Russia and Iran.

Azerbaijan could do something very funny right now.

04.03.2026 07:52 ๐Ÿ‘ 2 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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Paperback books are called Taschenbuch in German. Literally "pocket book". I don't think my pockets are large enough.

03.03.2026 12:52 ๐Ÿ‘ 3 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

This is just about perfect for my reading level in French!

01.03.2026 08:37 ๐Ÿ‘ 1 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

Carl, the lesser known second cousin of Konrad Zuse?

26.02.2026 15:35 ๐Ÿ‘ 0 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
Mรผndliche 
Prรผfungen werden in der Regel von mindestens zwei Prรผferinnen oder Prรผfern bzw. einer 
Prรผferin oder einem Prรผfer in Gegenwart einer sachkundigen Beisitzerin oder eines 
Beisitzers abgenommen.

Mรผndliche Prรผfungen werden in der Regel von mindestens zwei Prรผferinnen oder Prรผfern bzw. einer Prรผferin oder einem Prรผfer in Gegenwart einer sachkundigen Beisitzerin oder eines Beisitzers abgenommen.

So if I'm reading these exam regulations correctly, only women need to be qualified to act as an observer. Men just need to exist.
Seems unintentionally on brand for academia I guess.

25.02.2026 15:41 ๐Ÿ‘ 1 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

It's fine. The admin in question knows who they are and what they did.

19.02.2026 08:58 ๐Ÿ‘ 1 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

It is really impressive how shitty the "search" functionality in essentially all Google products is, considering that that used to their entire selling point.

Search in the Gmail app just doesn't do anything, but also doesn't tell you that.
Searching chrome history doesn't find anything ever.

15.02.2026 14:54 ๐Ÿ‘ 2 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

Why not repeal the laws of thermodynamics? They've been holding us back for way too long!

13.02.2026 06:17 ๐Ÿ‘ 2 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0

It's 8:00am.

12.02.2026 07:25 ๐Ÿ‘ 2 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

Honestly I'd prefer it without the pictures.

09.02.2026 16:28 ๐Ÿ‘ 0 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

What is that when supposed to mean? People stop listening to music? People only listen to music for some non-fun purpose?

08.02.2026 20:59 ๐Ÿ‘ 1 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0

No need. The frigate Brandenburg already exists. ๐Ÿคทโ€โ™‚๏ธ

06.02.2026 16:14 ๐Ÿ‘ 1 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

Whoever came up with the idea that phones should blink their camera flag as a form of notification should be forced to look directly into bright flashing LEDs for the rest of their life.

06.02.2026 15:23 ๐Ÿ‘ 2 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
PrivCrypt 2026

I am co-organising (with @drl3c7er.bsky.social and Lucjan Hanzlik) a workshop on Privacy-Enhancing Cryptography in Rome on May 10 as an affiliated event to IACR Eurocrypt. Submit your best PEC-work (3-page extended abstract) for presentation by February 25th: privcryptworkshop.github.io

05.02.2026 23:26 ๐Ÿ‘ 11 ๐Ÿ” 9 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0

Wtf is this and how is this the recommended way to install... well... anything really.

05.02.2026 19:13 ๐Ÿ‘ 1 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

I still don't quite understand what conda is supposed to *be*, but apparently using it to install sagemath involves downloading completely separate versions of perl, python, and open-jdk among a full GB of other crap. All of which definitely already exist on my system.

05.02.2026 19:12 ๐Ÿ‘ 0 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0

I don't see any option besides building from sources. (Which is not overly likely to succeed if I'm being honest.) I thought we were past this kind of bullshit.

05.02.2026 18:22 ๐Ÿ‘ 0 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0

Me, the naive dipshit: I'll just install sagemath real quick to check something.
Wise Maintainers: Oh yeah, no there is no sagemath Ubuntu package anymore.
M: Huh...
W: But you can install it via "conda"! Much better.
M: So there's an Ubuntu package for conda?
W: [manic laughter]

05.02.2026 18:19 ๐Ÿ‘ 3 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0

That would make slightly more sense. (I maintain that that's not supported by the wording.) It still assumes that papers are rejected for actual problems and not because there's not enough room and the reviewers were slightly less enthusiastic than those for the other 20 perfectly fine papers.

03.02.2026 07:15 ๐Ÿ‘ 0 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
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I'm sorry, but what? People want authors to be blocked from submitting because they had a paper rejected? That's insane.

03.02.2026 06:22 ๐Ÿ‘ 2 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0

Public transit's on strike, so I couldn't get to the office. BUT, that meant I was much closer to school when they called that I should pick up my sick kid. So... Yay for public transit strike?

02.02.2026 10:20 ๐Ÿ‘ 2 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

I guess it's not imposter syndrome if everyone apparently agrees. ๐Ÿค”

31.01.2026 10:50 ๐Ÿ‘ 1 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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I guess I'm doing this wrong.

31.01.2026 07:51 ๐Ÿ‘ 1 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

Them's fighting words.

30.01.2026 14:08 ๐Ÿ‘ 0 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
\[
  f(\vec{u},x,i) := \vec{v} \qquad v_j := \begin{cases}u_j & j\neq i\\ m & j=i \end{cases}
\]

\[ f(\vec{u},x,i) := \vec{v} \qquad v_j := \begin{cases}u_j & j\neq i\\ m & j=i \end{cases} \]

Imagine you have the following function and want to give it a good name that tells the reader what it does. What would that name be?
So far the super serious contenders are "๐ŸŒฑ" because we're planting m at position i, or "๐Ÿ’‰" because m is being injected at position i.

30.01.2026 13:41 ๐Ÿ‘ 0 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0