Nils Fleischhacker's Avatar

Nils Fleischhacker

@cryptomaeher.bsky.social

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

320 Followers  |  200 Following  |  452 Posts  |  Joined: 03.07.2023  |  1.8724

Latest posts by cryptomaeher.bsky.social on Bluesky


Mündliche 
Prüfungen werden in der Regel von mindestens zwei Prüferinnen oder Prüfern bzw. einer 
Prüferin oder einem Prüfer in Gegenwart einer sachkundigen Beisitzerin oder eines 
Beisitzers abgenommen.

Mündliche Prüfungen werden in der Regel von mindestens zwei Prüferinnen oder Prüfern bzw. einer Prüferin oder einem Prüfer 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 — 👍 1    🔁 0    💬 0    📌 0

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

19.02.2026 08:58 — 👍 1    🔁 0    💬 0    📌 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 — 👍 2    🔁 0    💬 0    📌 0

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

13.02.2026 06:17 — 👍 2    🔁 0    💬 1    📌 0

It's 8:00am.

12.02.2026 07:25 — 👍 2    🔁 0    💬 0    📌 0

Honestly I'd prefer it without the pictures.

09.02.2026 16:28 — 👍 0    🔁 0    💬 0    📌 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 — 👍 1    🔁 0    💬 1    📌 0

No need. The frigate Brandenburg already exists. 🤷‍♂️

06.02.2026 16:14 — 👍 1    🔁 0    💬 0    📌 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 — 👍 2    🔁 0    💬 1    📌 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 — 👍 11    🔁 9    💬 1    📌 0

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

05.02.2026 19:13 — 👍 1    🔁 0    💬 0    📌 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 — 👍 0    🔁 0    💬 1    📌 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 — 👍 0    🔁 0    💬 1    📌 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 — 👍 3    🔁 0    💬 1    📌 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 — 👍 0    🔁 0    💬 1    📌 0
Post image

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 — 👍 2    🔁 0    💬 1    📌 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 — 👍 2    🔁 0    💬 0    📌 0

I guess it's not imposter syndrome if everyone apparently agrees. 🤔

31.01.2026 10:50 — 👍 1    🔁 0    💬 0    📌 0
Post image

I guess I'm doing this wrong.

31.01.2026 07:51 — 👍 1    🔁 0    💬 0    📌 0

Them's fighting words.

30.01.2026 14:08 — 👍 0    🔁 0    💬 0    📌 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 "🌱" because we're planting m at position i, or "💉" because m is being injected at position i.

30.01.2026 13:41 — 👍 0    🔁 0    💬 1    📌 0

Whois says the domain is owned by the IACR, so you're probably right.

28.01.2026 08:34 — 👍 0    🔁 0    💬 0    📌 0

The ia.cr/XXXX/YYY links have stopped working, which is very unfortunate. But I don't know who's responsible for running that service.

28.01.2026 08:10 — 👍 0    🔁 0    💬 1    📌 0

Be careful what you wish for. That email could have been a meeting.

27.01.2026 04:47 — 👍 0    🔁 0    💬 1    📌 0

Are you a bit late or very early?

21.01.2026 14:15 — 👍 1    🔁 0    💬 1    📌 0
Screenshot von tagesschau.de "Trump rechnet mit Lösung im Grönland-Streit"

Screenshot von tagesschau.de "Trump rechnet mit Lösung im Grönland-Streit"

"Vergewaltiger rechnet mit Lösung im Geschlechtsverkehr-Streit"

21.01.2026 06:53 — 👍 0    🔁 0    💬 0    📌 0

But he's not thanking him for his attention to this matter. Must have been written by someone else. 🕵️‍♂️

It truly reads like satire.

19.01.2026 18:09 — 👍 2    🔁 0    💬 0    📌 0

You should consider consolidating those two keyboards on your desk into a single combined keyboard.

17.01.2026 12:23 — 👍 2    🔁 0    💬 0    📌 0

I suspected something like this. It did look a bit funny though.

16.01.2026 14:01 — 👍 0    🔁 0    💬 1    📌 0

Liebe Medien, ich kann die Schlagzeile "Keine Einigung zwischen USA und Dänemark" nicht mehr sehen. Wenn ein Bewaffneter eine Bank stürmt, titelt ihr doch auch nicht: "Räuber und Kassiererin finden keinen Konsens über Geldübergabe." Hört auf, imperiale Aggression als normale Diplomatie zu framen.

15.01.2026 10:44 — 👍 5473    🔁 1591    💬 89    📌 55

@cryptomaeher is following 20 prominent accounts