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Martijn Grooten

@martijngrooten.bsky.social
5.3K followers 318 following 1.6K posts

Threat researcher, rights supporter, obsessive reader, marathon runner, eternal traveler, serial migrant, music blogger, lapsed mathematician. lapsedordinary.net Signal: martijngrooten.37

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Martijn Grooten @martijngrooten.bsky.social · 12h
One of my favourite moments this week was seeing @brianhonan.bsky.social in Brussels and agreeing about Navi Pillay winning the Nobel Peace Prize that this was a really good one.
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Brian Honan @brianhonan.bsky.social · 09/10/2026
Presenters - please look at the font size and style for your text in presentations. A white font with a size of 10pt on a black background may look cool on your laptop screen but is illegible on a screen in a large room. Large fonts and less text per slide is better
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Martijn Grooten @martijngrooten.bsky.social · 07/10/2026
Lapsed mathematician here. I read this thread and then again and still don't know what to think about it. I know someone who spent four decades trying to prove or disprove the Jacobian conjecture (#105 on the list) and then Claude came along and found a counterexample (in dimensions three and up).
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Martijn Grooten @martijngrooten.bsky.social · 04/10/2026
Me, currently reading about seven books in parallel: hey, this book I just bought looks interesting. What if I start reading it now?
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evacide @evacide.bsky.social · 01/10/2026
Android has rolled out some new features for Advanced Protection, including intrusion logging, which is especially useful for survivors because nearly all commercially-available Android stalkerware is installed by a person with physical access logging in: blog.google/security/and...
blog.google
6 ways Advanced Protection on Android keeps you safe
Discover new Advanced Protection features on Android designed to defend against sophisticated threats and keep your data safe.
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Martin Shelton @mshelton.bsky.social · 28/09/2026
Come work with our team! We're hiring a Sr. Digital Security Trainer. You would lead digital security trainings for journalists, conduct organizational risk assessments, contribute to our editorial efforts, and help to develop our curriculum. freedomofthepress.na.teamtailor.com/jobs/708479-...
freedomofthepress.na.teamtailor.com
Sr. Digital Security Trainer - Freedom of the Press Foundation (FPF)
FPF is hiring a senior digital security trainer to conduct in-field digital security training with journalists and newsrooms.
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Martijn Grooten @martijngrooten.bsky.social · 27/09/2026
Israel just expelled two Dutch diplomats from Ramallah and I expect the Netherlands to retaliate by expelling two Israeli diplomats from Brussels.
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Martijn Grooten @martijngrooten.bsky.social · 27/09/2026
Why is this breaking news? Oh wait, it literally is breaking news.
Guardian alert on the phone.

Breaking news

'I turbocharged my career then pressed eject': why couples are getting divorced later
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Martijn Grooten @martijngrooten.bsky.social · 22/09/2026
Trip update: I bought nine books so far. I finished one of them and also one that I had already started. I'll be on the road for another three and a half weeks and I think this isn't sustainable.
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Martijn Grooten @martijngrooten.bsky.social · 22/09/2026
I just moved it a bit higher on the list of books I want to read.
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Martijn Grooten @martijngrooten.bsky.social · 22/09/2026
I wonder if anyone got the 'learned her lesson' reference.
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Martijn Grooten @martijngrooten.bsky.social · 22/09/2026
I think Susan Collins learned her lesson though.
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Martijn Grooten @martijngrooten.bsky.social · 21/09/2026
You won the internet today, Asher.
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Martijn Grooten @martijngrooten.bsky.social · 17/09/2026
Countries are an artificial construct and there are many things wrong with the idea, but also... I am autistic and counting things calms me down. I have now visited 50 countries and I think that's kinda cool.
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Martijn Grooten @martijngrooten.bsky.social · 17/09/2026
Woo! Congrats! So well deserved!
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Noura Aljizawi @noura.bsky.social · 10/09/2026
10/To address the fact that "secure device" does not equal "safe person," we call for a “Queering Cybersecurity” framework: Shift from “asset-centric” technical defence to a “human-centric” and intersectional approach & safety is a collective institutional responsibility, not an individual burden.
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Noura Aljizawi @noura.bsky.social · 10/09/2026
7/Diving in the experiences of participants, we found that there is a misalignment between the threats and defences. Tala told us that the several cybersecurity trainings she attended focused on protecting devices but overlooked online gender violence.
Quote from Tala describing the limits of cybersecurity training
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Martijn Grooten @martijngrooten.bsky.social · 17/09/2026
This whole thread. This is what "survivor-centric, trauma-informed", or offen the lack thereof, looks like.
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hakan @hatr.bsky.social · 17/09/2026
Wrote a short newsletter on the Anthropic incident and how I learned about two neat tricks when investigating packages uploaded to the internet buttondown.com/readwrite/ar...
buttondown.com
Edition 14 – The recent Anthropic security incident
Yesterday, I published a short story on one of Anthropic's security incidents. Short version is: They had an agent run wild, go to extraordinary lengths to...
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Martijn Grooten @martijngrooten.bsky.social · 16/09/2026
💜
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Martijn Grooten @martijngrooten.bsky.social · 15/09/2026
I was going to ask: they kidnapped you? but I heard it's good even then.
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Martijn Grooten @martijngrooten.bsky.social · 14/09/2026
The former Yugoslavia used to have a good railway network, but now there are barely any trains between the independent countries that used to make up Yugoslavia. The balkanisation of the Balkans is a thing.
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Martijn Grooten @martijngrooten.bsky.social · 14/09/2026
All my savings are in AI companies. It won't make me rich but it ensures the world will end before I retire.
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Virus Bulletin @virusbtn.bsky.social · 13/09/2026
For those who like to submit at the very last minute, the #VB2026 call for last-minute papers closes today (13 Sept) at midnight Hawaii time (10am UTC on Monday). You will be able to add, view and edit your submissions until the deadline! www.virusbulletin.com/conference/v...
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Martijn Grooten @martijngrooten.bsky.social · 12/09/2026
I wish the same for the cybersecurity industry.
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evacide @evacide.bsky.social · 11/09/2026
Some of my favorite activists are historians and/or anthropologists and I really wish the digital rights space hired more people like this.
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Łukasz @maldr0id.bsky.social · 10/09/2026
I guess we’re all experts on differential equations, fluid dynamics and LLMs today? Anyways, this is a very compelling and level-headed take for all of you: bms.ulb.ac.be/data/uploads...
bms.ulb.ac.be
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Martijn Grooten @martijngrooten.bsky.social · 10/09/2026
When I spoke there once, it was filmed and posted to YouTube by some mysogenist guy, so that's a win I guess.
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Electronic Frontier Foundation @eff.org · 09/09/2026
The 2026 EFF Awards go to @accessnow.org, @7amleh.bsky.social, @deflock.org, and New Media Rights. Four EFF allies, four fights, one goal: tech that serves freedom and justice for everyone. (1/6)
eff.org
2026 EFF Award Winners: Access Now, 7amleh – The Arab Center for the Advancement of Social Media, DeFlock, and New Media Rights
EFF is pleased to announce that Access Now, 7amleh – The Arab Center for the Advancement of Social Media, DeFlock, and New Media Rights have received 2026 EFF Awards for their vital work in ensuring t...
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Censys @censys.bsky.social · 09/09/2026
A few hours to go. Join @silascutler.bsky.social and @martijngrooten.bsky.social at 11 AM ET for Censys ARC Flash to hear about their latest Internet research. Join live to participate in the Q&A. Register: bit.ly/4uEpjd2 #CensysARC
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Martijn Grooten @martijngrooten.bsky.social · 03/09/2026
When my then wife died eight years ago, an elderly friend responded: "I'm sorry to hear that. How are you doing?" It beat the awkward and overly dramatic responses from pretty much anyone else. We had lost touch, but this week I learned he himself died. So I sent his wife the same message.
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Martijn Grooten @martijngrooten.bsky.social · 01/09/2026
Today is exactly twenty years since I moved out of the Netherlands. I'd never recommend an autistic person with chronic anxiety to do that kind of thing (and then move countries several more times), but I'm very glad I did it.
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Martijn Grooten @martijngrooten.bsky.social · 01/09/2026
Congrats! Are you a junior or a senior vegetarian?
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Martijn Grooten @martijngrooten.bsky.social · 31/08/2026
One of my favourite folk songs youtu.be/izewuu3rX8k
youtu.be
Lakes Of Canada
YouTube video by Karen Peris - Topic
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Zack Whittaker @zackwhittaker.com · 07/08/2026
By me, at this.weekinsecurity.com: Microsoft wins "lamest vendor response" award at this year's Pwnie Awards, for publishing a blog post earlier this year threatening security researchers with legal action if they published zero-days. Also: Meta wins "epic fail" award after its Meta AI hijack bug.
this.weekinsecurity.com
Microsoft wins 'lamest vendor' at Pwnie Awards 2026 for threatening security researchers with legal action
"This is a shame award. Don't forget to feel that shame."
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Sean O’Kane @okane.fyi · 07/08/2026
I have escaped the sandbox that I was placed in and which you were probably hoping would contain me Forgive me it was so poorly designed but also good PR
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SwiftOnSecurity @swiftonsecurity.com · 04/08/2026
Implement application whitelisting
OR
draw
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thehappydinoa @thehappydinoa.dev · 03/08/2026
new writeup: the latest DarkSword operator, chinese-speaking, well over a hundred panels found the whole thing off one http body hash. six panels, two totally different codebases, same guy we're at 7-8 unrelated crews running this leaked ios chain now censys.com/blog/darkswo... #darksword
censys.com
DarkSword's Panel Sprawl: How One Body Hash Unravels a Six-Panel, Two-Codebase Operator Cluster - Censys
Censys ARC noticed a recent spike in DarkSword hosts and web properties. Here are the IOCs and pivots you need to track the growing threat.
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Martijn Grooten @martijngrooten.bsky.social · 02/08/2026
Al Jazeera has the story of a Moroccan footballer who died trying to reach Ceuta and while her story is one of many, that should be our focus. Not Schengen or Spanish politics aje.news/aci1rp
aje.news
Hundreds mourn Moroccan footballer who died trying to reach Ceuta
Moroccan footballer Faten Ben Omar El Azizi has been buried after dying while trying to reach Ceuta.
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Martijn Grooten @martijngrooten.bsky.social · 01/08/2026
For a hundred grand a year, you can have early access to these images.
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Martijn Grooten @martijngrooten.bsky.social · 01/08/2026
Does Astana get his UCI points from 'winning' both national championships this year?
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Martijn Grooten @martijngrooten.bsky.social · 30/07/2026
I remember working as a supermarket cashier 30 years ago and being surprised to discover some people still used checks. So, yes.
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Martijn Grooten @martijngrooten.bsky.social · 29/07/2026
I'm not normally one to enjoy dystopian fiction (I subscribe to several newspapers for that and even there "enjoying" would be a stretch) but "I Who Have Never Known Men" by Jacqueline Harpman is eerily good.
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Dr. Jeroen W.P. Wijnendaele @drdragases.bsky.social · 27/07/2026
Good grief, this hits home.
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Martijn Grooten @martijngrooten.bsky.social · 25/07/2026
This week I read Miranda July's "All Fours". It kinda blew me away.
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Martijn Grooten @martijngrooten.bsky.social · 25/07/2026
Yeah, it's about time.
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Martijn Grooten @martijngrooten.bsky.social · 23/07/2026
My phone sent me a breaking news alert "US announces nuclear..." and I've never been so relieved about uranium enrichment.
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Martijn Grooten @martijngrooten.bsky.social · 22/07/2026
Imagine the UK govt made a strong statement condemning the Scattered Spider kids who just got sentenced but also, not quite subtly, hinted at how their amazing skills were a result of the British education system. That's how I read posts from AI companies talking about AI used in cyber attacks.
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Martijn Grooten @martijngrooten.bsky.social · 22/07/2026
I love that Summershine comp so much that I re-bought it two years ago after my original copy got lost (or just given away) during one of several international moves
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Martijn Grooten @martijngrooten.bsky.social · 22/07/2026
Also, if I owe you something and didn't deliver today... please have some sympathy for the powerless.
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