Advertisement · 728 × 90

Posts by Kurt Opsahl

Translation: they are proposing a bill that says you cannot under any circumstances use a computer for any purpose without allowing the United States government continuous monitoring and a backdoor

5 days ago 2404 1472 0 12
Post from Vercels Twitter account. "We’ve identified a security incident that involved unauthorized access to certain internal Vercel systems, impacting a limited subset of customers. Please see our security bulletin:"

Post from Vercels Twitter account. "We’ve identified a security incident that involved unauthorized access to certain internal Vercel systems, impacting a limited subset of customers. Please see our security bulletin:"

Vercel hasn't posted this on Bluesky yet but they have a very significant security leak.

Welp, there goes my Sunday. Damn it man.

If you have anything hosted on Vercel, take action now.

2 days ago 39 22 6 3
Abstract. The Double Ratchet (DR) protocol is a core security component of several end-to-end encrypted communications services, primarily Signal Messenger, WhatsApp, and Facebook Messenger, servicing billions of users. In this work, we provide the first formal analysis of the DR covering all of its features, including out-of-order message arrivals. This analysis is highly automated, allows for all possible key compromises and notably proves Post-Compromise Security (PCS). We also provide partial results for the security of more complex protocol variants, these being the extension of the DR with encrypted headers, and composition with PQXDH as the initial key-exchange. Our analysis uncovered three attacks on the protocol, two of which we confirmed to be present in the main implementation, and a third which exists in the specification. Each of these attacks weakened or broke Forward Secrecy, and are to the best of our knowledge the first such known attacks. In each case, the issues were reported to the Signal developers and subsequently fixed. Overall, our analysis provides new guarantees of the security of Signal Messenger, and demonstrates the high level of security provided by the DR under a variety of strong threat models.

Abstract. The Double Ratchet (DR) protocol is a core security component of several end-to-end encrypted communications services, primarily Signal Messenger, WhatsApp, and Facebook Messenger, servicing billions of users. In this work, we provide the first formal analysis of the DR covering all of its features, including out-of-order message arrivals. This analysis is highly automated, allows for all possible key compromises and notably proves Post-Compromise Security (PCS). We also provide partial results for the security of more complex protocol variants, these being the extension of the DR with encrypted headers, and composition with PQXDH as the initial key-exchange. Our analysis uncovered three attacks on the protocol, two of which we confirmed to be present in the main implementation, and a third which exists in the specification. Each of these attacks weakened or broke Forward Secrecy, and are to the best of our knowledge the first such known attacks. In each case, the issues were reported to the Signal developers and subsequently fixed. Overall, our analysis provides new guarantees of the security of Signal Messenger, and demonstrates the high level of security provided by the DR under a variety of strong threat models.

Image showing part 2 of abstract.

Image showing part 2 of abstract.

Automated formal analysis of Signal’s Double Ratchet: attacks, fixes and security proofs (Vincent Cheval, Charlie Jacomme, Jessica Richards) ia.cr/2026/727

2 days ago 4 3 0 0
Preview
Keep Pushing: We Get 10 More Days to Reform Section 702 In a dramatic middle-of-the-night stand off, a bipartisan set of lawmakers pushing for true reform and privacy protections for Americans bought us some more time to fight! They are holding out for, at...

Privacy stalwarts in Congress just bought us 10 more days to put together a bill that actually reforms Section 702. Keep pushing.

3 days ago 182 75 2 5

Its not too late to submit your talk, panel, or session to Policy@ DEF CON 34! This years theme is Agency. CFP Closes 1May26
defcon.org/html/defcon-...

3 days ago 2 4 0 0
Preview
Hackers are abusing unpatched Windows security flaws to hack into organizations | TechCrunch A security researcher published details of three security vulnerabilities in Windows Defender, and the code used to exploit them. Now, hackers are taking advantage of the vulnerabilities in real-life ...

NEW: Hackers are exploiting unpatched Windows vulnerabilities that were disclosed publicly by a disgruntled researcher.

The researcher published code to exploit these bugs on GitHub. Now someone else has taken the code and used it in at least one attack in the wild, according to a security firm.

4 days ago 15 7 0 1

nonzero chance the FBI is plugging LLMs into wiretap data under the legal theory AI alone can’t implicate 4th amendment concerns (semi-known 702 issue). or the NSA has now hard coded wiretaps across all newly built US data centers due to expanded ECSP scope. or probably both.

4 days ago 1746 563 15 30
Preview
Inside TurboTax’s 20-Year Fight to Stop Americans From Filing Their Taxes for Free Using lobbying, the revolving door and “dark pattern” customer tricks, Intuit fended off the government’s attempts to make tax filing free and easy, and created its multi-billion-dollar franchise.

The 2019 ProPublica TurboTax investigation never gets old

6 days ago 510 172 1 3

BREAKING: A jury has found Live Nation and Ticketmaster to be an illegal monopoly that overcharges fans.

After the federal government settled the case, 34 states kept pursuing the giant ticket and concert company.

Now, the states have won.

6 days ago 10936 2605 144 311
Post image

Why the SCOTUS geofence warrant case to argued in two weeks might be decided on narrow grounds— a thought on Chatrie, the first in a series. First few paras in the screenshot. reason.com/volokh/2026/...

1 week ago 12 4 1 1
Advertisement
Post image

was once New Amsterdam.

1 week ago 10375 1733 103 71
Claude Mythos Preview \ red.anthropic.com

red.anthropic.com/2026/mythos-... people keep being astonished at them doing the kind of exploits you can only pull off if you never get tired - when their most unique skill is they don’t ever get tired.

1 week ago 4 1 0 0

Alright, it's official! 💰

@matthewdgreen.bsky.social and I bet on what will break first, ML-KEM-768 or X25519. The loser donates to a 501(c)(3) picked by the winner.

If you have an opinion on quantum computers or lattices, you can join with a side bet. Just submit a PR!

github.com/FiloSottile/...

1 week ago 117 29 7 2
Preview
Section 702 of the Foreign Intelligence Surveillance Act For too long, this law has allowed the government to evade privacy protections and spy on Americans. Reform is overdue.

President Trump is urging Congress to renew Section 702 of the Foreign Intelligence Surveillance Act, but lawmakers in both parties oppose extending it without reforms. Congress now has a chance to protect Americans’ privacy. bit.ly/4tASUmW

1 week ago 85 39 1 1
The Video NASA’s Laser Communications Experiment Streamed From Deep Space
The Video NASA’s Laser Communications Experiment Streamed From Deep Space YouTube video by JPLraw

Reminder: All the amazing high quality video you’re seeing from the Artemis II mission is being transmitted back to Earth using a laser communications system first tested with a video of a cat named Taters

youtu.be/GvJtVOmFs5Q?...

2 weeks ago 1104 405 13 26
Preview
Intelligence Court Renews Surveillance Program Whose Law May Soon Lapse

Another year, and another secret ruling from the FISA court showing the FBI is violating Americans' privacy via NSA surveillance.

When will Congress finally learn and actually require a warrant for Americans' communications under FISA Section 702?

1 week ago 92 48 6 2
Preview
FBI Extracts Suspect’s Deleted Signal Messages Saved in iPhone Notification Database The case was the first time authorities charged people for alleged “Antifa” activities after President Trump designated the umbrella term a terrorist organization.

New from 404 Media: the FBI was able to extract incoming Signal messages from a phone even though the app was deleted. Why? Because parts of messages were stored in the iPhone's internal notification database. Shows how secure chat data can come from unexpected places www.404media.co/fbi-extracts...

1 week ago 1247 667 18 84

sourcing request: I am looking for recruiters or managers at major tech companies who are trying to hire cybersecurity talent. if that's you, and you want to talk to me on background or on-record, please get in touch! contact info in my bio.

1 week ago 58 31 4 1

Would you like to help us test Privacy Badger for Safari on macOS? You'll need Safari 26 and Apple's TestFlight app.

If this sounds good, please send an email to extension-devs at eff.org and we'll send you an invite when the build is ready.

2 weeks ago 38 16 1 0
Advertisement
Post image

"‘Creepy surveillance’: why some cities are shutting down Flock cameras amid privacy concerns," via The Guardian. www.theguardian.com/us-news/ng-i...

2 weeks ago 36 11 0 0
Preview
FISA Section 702 Isn’t Broken. Why Are We Still Trying to Fix It? Recent statutory reforms are working, so discredited arguments and misleading claims shouldn’t be allowed to derail reauthorization.

Recently former NSA General Counsel Glenn Gerstell published a @lawfaremedia.org piece on FISA 702
Despite claiming to fact check a Brennan Center brief on the topic, the piece is riddled with misleading claims, it contains no less than 4 key factual errors...
www.lawfaremedia.org/article/fisa...

2 weeks ago 17 8 3 2
Preview
A Cryptography Engineer’s Perspective on Quantum Computing Timelines The risk that cryptographically-relevant quantum computers materialize within the next few years is now high enough to be dispositive, unfortunately.

"A Cryptography Engineer’s Perspective on Quantum Computing Timelines" from Filippo Valsorda who is the coolest and smartest words.filippo.io/crqc-timeline/

2 weeks ago 5 1 0 0

On Tuesday, I wrote "well of course your conversations with AI chatbots count as contents of electronic communications; we know that from 20 years of lawsuits over alleged ECPA violations based on web tracking."

Well look what got filed the SAME DAY! storage.courtlistener.com/recap/gov.us...

2 weeks ago 8 6 2 0

Quake in the Santa Cruz mountains. earthquake.usgs.gov/earthquakes/...

2 weeks ago 1 0 0 0
Video

This cat knows how to enjoy life..😂

TT: moonkitty874

3 weeks ago 4606 570 106 57
Cindy Cohn - Fighting for Digital Human Rights in “Privacy’s Defender” | The Daily Show
Cindy Cohn - Fighting for Digital Human Rights in “Privacy’s Defender” | The Daily Show YouTube video by The Daily Show

This is an interview that is well worth your time: youtu.be/QkC1aK7jfLo

3 weeks ago 60 22 3 0
Advertisement

Don’t miss this one! Cindy is amazing, you’ll want to tune in and hear how she really breaks things down about the fight for privacy.

3 weeks ago 160 32 6 1
Preview
Supreme Court Agrees With EFF: ISPs Don't Have To Be Copyright In Cox v. Sony, the Court reversed a Fourth Circuit decision that had upheld a billion-dollar verdict against internet provider Cox Communications. We live in a world where high speed internet access

The Supreme Court says ISPs aren’t responsible for everything their users do online. That means your access to the internet is less likely to be cut off over accusations alone. www.eff.org/deeplinks/2...

3 weeks ago 150 40 2 1
Preview
Job Opportunities

Have Brussels experience? Work with me (and my awesome colleagues). @eff.org is hiring an Assistant Director of EU Policy to co-lead our legal advocacy and lobby efforts across European institutions to protect digital rights. www.paycomonline.net/v4/ats/web.p...

3 weeks ago 21 23 0 2
Preview
Nicole Ozer Named as Electronic Frontier Foundation’s Executive Director SAN FRANCISCO – Nicole Ozer has been appointed as executive director of the Electronic Frontier Foundation effective June 1. Ozer is a legal expert on privacy and surveillance, artificial intelligence...

Nicky Ozer is the new @eff.org ED! www.eff.org/press/releas...

3 weeks ago 3 2 0 0