Diego F. Aranha
@dfaranha.bsky.social
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Associate Professor of Cryptographic Engineering at Aarhus University.
https://dfaranha.github.io/
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Diego F. Aranha
Real World Crypto Symposium
19 days ago
Speaker Nikolas Melissaris talks about What Is Cryptography Hiding from Itself? by Diego F. Aranha and Nikolas Melissaris.
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Diego F. Aranha
Real World Crypto Symposium
19 days ago
The room gets philosophical. Cryptography & Society chaired by Nick Sullivan (
@nicksullivan.org
): what is crypto hiding from itself? Security vs. interoperability? CRA policy? Proofs that aren't enough? And Nadim Kobeissi on teaching crypto in post-crisis Lebanon.
#realworldcrypto
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Diego F. Aranha
Nadim Kobeissi
about 2 months ago
Come be part of Cedarcrypt, our historic new initiative to grow cryptography research, development and representation in the Levant region! We're seeking speakers and workshop leaders: our call for submissions is open! Learn more:
cedarcrypt.org
Please spread the word!
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Cedarcrypt 2026 - Applied Cryptography Summer School & Conference
Join us for four days of applied cryptography in the Mediterranean. July 13-16, 2026 at AUB Mediterraneo Campus, Paphos, Cyprus.
https://cedarcrypt.org
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Diego F. Aranha
Ian Coldwater đ§đŤ
30 days ago
So much ICE out there today in South Minneapolis. Theyâre prowling around harassing schools. Stay frosty, friends
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Diego F. Aranha
Matthew Green
about 2 months ago
I wrote a short blog post on the WhatsApp lawsuit, or whatever it is.
blog.cryptographyengineering.com/2026/02/02/w...
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WhatsApp Encryption, a Lawsuit, and a Lot of Noise
Itâs not every day that we see mainstream media get excited about encryption apps! For that reason, the past several days have been fascinating, since weâve been given not one but severâŚ
https://blog.cryptographyengineering.com/2026/02/02/whatsapp-encryption-a-lawsuit-and-a-lot-of-noise/
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Diego F. Aranha
Robert McNees
2 months ago
It has gotten so bad that the
@nytimes.com
has stopped using the passive voice to describe the violence.
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Diego F. Aranha
Lukasz Olejnik
2 months ago
Software error in continuous glucose monitors caused 736 serious injuries, and seven deaths.
abbott.mediaroom.com/press-releas...
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Diego F. Aranha
Sine Dolis
2 months ago
Bad news for other minorities, for the media, for civil society, the rule of law and democracy, too
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Diego F. Aranha
Sabine Oechsner
3 months ago
Come work with Peter Scholl
@schollster.bsky.social
and me in Aarhus!
add a skeleton here at some point
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If you believe that smart people cannot do utterly dumb things, just look at the Eurocrypt'26 rebuttal process.
3 months ago
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Achievement unlocked.
4 months ago
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Diego F. Aranha
Zohran Kwame Mamdani
4 months ago
Know your rights. Protect your neighbors. New York is â and always will be â a city for all immigrants.
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Diego F. Aranha
Lukasz Olejnik
4 months ago
CRITICAL security vulnerability in a really popular web framework React server. Maximum severity (CVSS: 10.0). Unauthenticated remote code execution. May be WORMABLE. Patch immediately. This could get very nasty. Patch this, and all that depends on it (like Next.js)
react.dev/blog/2025/12...
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Diego F. Aranha
Courtney Milan
4 months ago
I think itâs pretty clear at this point that one of the main impacts of LLMs is to disrupt thinking: to make it so that far too many people never properly learn how to do it, and then to control the output so there are thoughts that people never learn how to think.
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Nadim Kobeissi
4 months ago
My thoughts on the IACR election issue (since many have asked privately): - This was an honest accident, and Moti Yung deserves being cut some slack. Yes, itâs a silly mistake, but mistakes happen. - The IACR board reacted excellently and scheduled timely follow up elections. Continued in thread
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Diego F. Aranha
The Guardian
6 months ago
Against âchat controlâ: we canât eliminate child abuse by eliminating privacy
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Against âchat controlâ: we canât eliminate child abuse by eliminating privacy
Banning online anonymity tools like Tor wonât stop crime. It will only drive people underground and normalize government control over the internet
https://www.theguardian.com/commentisfree/2025/oct/13/chat-control-child-abuse-internet-privacy?utm_term=Autofeed&CMP=bsky_gu&utm_medium=&utm_source=Bluesky#Echobox=1760358432
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Diego F. Aranha
Matthew Green
5 months ago
The âage verificationâ and the âhuman identificationâ problem are the same problem. It upsets me to be around people who think theyâre working on the first, but donât understand theyâre actually working on the second.
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Diego F. Aranha
Center for Online Safety and Liberty
6 months ago
"Governments across the world are expanding surveillance, weakening encryption, and curtailing freedoms under the guise of staunching the proliferation of sexual images and videos of children"
https://www.theguardian.com/commentisfree/2025/oct/13/chat-control-child-abuse-internet-privacy
#Privacy
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Against âchat controlâ: we canât eliminate child abuse by eliminating privacy
Banning online anonymity tools like Tor wonât stop crime. It will only drive people underground and normalize government control over the internet
https://www.theguardian.com/commentisfree/2025/oct/13/chat-control-child-abuse-internet-privacy
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Diego F. Aranha
Matthew Green
6 months ago
This is amazing research by Nadia Heninger and her co-authors Wenyi Morty Zhang, Annie Dai, Keegan Ryan, Dave Levin and Aaron Schulman. TL;DR a huge number of satellite links over our heads are totally unencrypted.
satcom.sysnet.ucsd.edu
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đ°ď¸ SATCOM Security
Research project homepage for SATCOM Security: papers, source code, and recent satellite communications vulnerabilities.
https://satcom.sysnet.ucsd.edu
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Diego F. Aranha
Robert Reich
6 months ago
The 400 richest Americans are now worth a record $6.6 trillion. The entire bottom 50% of America is worth just $4.2 trillion. Read that back. When 400 people control more wealth than half a countryâs population, we have a very serious problem.
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Diego F. Aranha
Matthew Green
6 months ago
Germany has agreed to stop ChatControl for now, due to huge amounts of public pressure. Good job! The bad news is that it could come back as soon as December, and the German government has interpreted the feedback as a need to âmoderateâ the proposal.
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Diego F. Aranha
Matthew Green
6 months ago
I hear that the EU ChatControl situation is going better today. I cannot believe how close the EU has gotten to passing this crazy regulation.
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Diego F. Aranha
Keith W. Dickinson
6 months ago
Today is a day when arts degrees are worthless, but the product of those degrees is so valuable it would kill an entire industry if they were made to pay for it.
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Someone please make me understand how Denmark can be at the same time freaking out about hybrid war with Russia AND pushing for government-mandated spyware as Chat Control.
6 months ago
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Diego F. Aranha
Signal
6 months ago
We are alarmed by reports that Germany is on the verge of a catastrophic about-face, reversing its longstanding and principled opposition to the EUâs Chat Control proposal which, if passed, could spell the end of the right to privacy in Europe.
signal.org/blog/pdfs/ge...
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https://signal.org/blog/pdfs/germany-chat-control.pdf
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Sounds just like the Justice Minister of Denmark, who is pushing Chat Control with a crime-free society narrative.
bsky.app/profile/robe...
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6 months ago
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Diego F. Aranha
Karen Melchior
6 months ago
<<âbrain gainâ is exactly what we have experienced. As Danish companies have succeeded globally, they have sought out the best and brightest in their respective fields from across the world. The number of foreign workers in Copenhagen has more than doubled in the last decade.>>
@madshvid.bsky.social
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Diego F. Aranha
Natanael, Tech janitor
6 months ago
"Bad news: The proposal is going forward to be voted on on October 14th, and there's still no blocking minority achieved, as Germany reverted its position to undecided. Good news: There is still time to fight back!" Shut this monstrosity down NOW
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The battle to stop Chat Control continues, act now!
Unfortunately, the battle against Chat Control continues this month. For human rights, for civil liberties, for safety, and for democracy, this privacy-wrecking proposal must be stopped. We need your ...
https://www.privacyguides.org/newsletters/2025/09/23/the-battle-to-stop-chat-control-continues-act-now/
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Diego F. Aranha
Center for Democracy & Technology
6 months ago
Earlier this week, CDT joined civil society orgs, companies, & cybersecurity experts, including members of the
@globalencryption.org
, to urge the Canadian government to withdraw Bill C-2, the so-called Strong Borders Act.
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Canadaâs Strong Borders Act Threatens Strong Encryption
On September 15, 2025, CDT joined civil society organizations, companies, and cybersecurity experts, including members of the Global Encryption Coalition, to urge the Canadian government to withdraw Bill C-2, the so-called Strong Borders Act. Parts 14 and 15 of the bill would grant broad powers to compel backdoors into encrypted services and expand warrantless access [âŚ]
https://cdt.org/insights/canadas-strong-borders-act-threatens-strong-encryption/
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The impact of Alfred Menezes in cryptography is profound. Francisco RH and I are organizing an afternoon session in Latincrypt to celebrate Alfred's career:
menezesfest.info
If you're coming to MedellĂn, consider attending!
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MenezesFest 2025
MenezesFest brings together researchers, colleagues, and friends to celebrate the career and impact of Alfred Menezes.
https://menezesfest.info
6 months ago
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If ChatControl needs national security exemptions to *not* weaken the security of the state, what makes one believe that it will *not* weaken the security of everyone else?
bsky.app/profile/matt...
add a skeleton here at some point
6 months ago
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Diego F. Aranha
Matthew Green
6 months ago
I know itâs been said again and again, but what does it say about ChatControl that its backers keep explicitly *exempting* law enforcement and national security accounts from content scanning?
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Diego F. Aranha
Natanael, Tech janitor
7 months ago
Burn it with fire
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The EU has never been closer to agreeing on Chat Control â here's how we got here and whatâs at stake
The Danish version of Chat Control is thought to have the best chances of becoming law since 2022
https://www.techradar.com/vpn/vpn-privacy-security/the-eu-has-never-been-closer-to-agreeing-on-the-scanning-of-your-private-chats-but-how-did-we-get-here
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Diego F. Aranha
â§Vikintorâ§ đ§đˇ
7 months ago
Brazil bluesky today:
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Diego F. Aranha
Alec Muffett
7 months ago
I'm sympathetic, but I do think it is charming how teh lawyerz believe that you can legislate your way out of a threat model. "No one would ever do that, it's illegal."
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Diego F. Aranha
Tjerand Silde
7 months ago
The EU Parliament has published a new proposal for Chat Control to mass-surveil all digital communication in Europe. The proposal is ineffective, weakens secure communication, and violates basic human privacy. This must be stopped immediately.
#ChatControl
csa-scientist-open-letter.org/Sep2025
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https://csa-scientist-open-letter.org/Sep2025
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The EU wants to spend your money to assemble a giant mass surveillance machine with little effect on harm against children. Chat Control is not effective, weakens security for all and does not respect privacy. Contact your EU representatives and let them know.
csa-scientist-open-letter.org/Sep2025
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https://csa-scientist-open-letter.org/Sep2025
7 months ago
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Diego F. Aranha
Andrea Basso
7 months ago
More than 500 researchers have signed an open letter against the dangerous EU proposal on chat control. The proposal remains ineffective, undoes decades of results in E2E encryption, and threatens the privacy of half a billion citizens.
csa-scientist-open-letter.org/Sep2025
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https://csa-scientist-open-letter.org/Sep2025
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It was too late when I figured out this was not about cryptography.
bsky.app/profile/arju...
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7 months ago
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7 months ago
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Diego F. Aranha
Martijn Grooten
7 months ago
I'm here for
@dangoodin.bsky.social
debunking some wild claims about apparent passkey insecurity made from the Defcon stage, the TL;DR of which is that if your endpoint is compromised, all bets are off
arstechnica.com/security/202...
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Unpacking Passkeys Pwned: Possibly the most specious research in decades
Researchers take note: When the endpoint is compromised, all bets are off.
https://arstechnica.com/security/2025/08/new-research-claiming-passkeys-can-be-stolen-is-pure-nonsense/
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Computer security research is about discovering what someone else out there does not want discovered; everything else is compliance.
7 months ago
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The attempts to defend Chat Control (
chatcontrol.dk
) as "not mass surveillance" are really puzzling to read, because I don't think I've ever come across a better textbook example of mass surveillance, dressed as think-of-the-children legislation.
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redirecting
Redirecting...
https://chatcontrol.dk/
7 months ago
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Diego F. Aranha
COSIC
7 months ago
Proud moment at
#CRYPTO
2025! âKLPT²: Algebraic Pathfinding in Dimension Two and Applicationsâ received the Best Paper Award. đ Co-authored by COSICâs Wouter Castryck & Thomas Decru (presenter). Read it here:
eprint.iacr.org/2025/372
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Diego F. Aranha
Ben Adida
7 months ago
In case you're wondering why we use voting machines in the US:
podcast.voting.works/2407158/epis...
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Episode 2 â Voting Machines - How Voting Works
Let's talk about why we need voting machines in the US, and the specific types of voting machines we use and how they work.The Reality of Full Hand Counts: A Guide for Election Officials, by the Elect...
https://podcast.voting.works/2407158/episodes/15896797-episode-2-voting-machines
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Diego F. Aranha
Natanael, Tech janitor
8 months ago
It's not though because they don't care about crime, they care about perception
add a skeleton here at some point
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Diego F. Aranha
Peergos
8 months ago
We've been using Ed25519 in browsers for over 10 years now (every identity and writer is an Ed25519 pair in Peergos), so we really appreciate this and how much work it has been. The size of nacl.js is 30KB so not a significant benefit, but the web-crypto version is 10x faster!
add a skeleton here at some point
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Diego F. Aranha
Matt Blaze
8 months ago
We are pleased to announce the final* schedule of talks for the 2025 Symposium on Election Security at the DEF CON Voting Village, August 8-10, in quiet, sleepy Las Vegas. Hope to see you there!
www.mattblaze.org/papers/VV202...
* -subject to change
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https://www.mattblaze.org/papers/VV2025-schedule.pdf
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Diego F. Aranha
Dr. Johnathan Flowers, Bisexual of the Blade (Alt-text or DIE)
8 months ago
Something that I have been thinking about with attribution of "PhD level intelligence" or "PhD level expertise" to a machine is that it reflects an increasing trend among these AI bros and their sycophants to want the products of highly skilled training without actually doing any of the work.
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Diego F. Aranha
Deirdre Connollyš ²
8 months ago
pew pew pew
add a skeleton here at some point
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