Claudio Álvarez

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Claudio Álvarez

Claudio Álvarez

@Claudio_AG

Associate Professor of Computer Science at Universidad de los Andes, Chile. I teach CS and research in EdTech. Husband & father of two.

Santiago, Chile Katılım Kasım 2007
2.1K Takip Edilen651 Takipçiler
Claudio Álvarez retweetledi
VECERT Analyzer
VECERT Analyzer@VECERTRadar·
🚨 CRITICAL CYBER THREAT INTELLIGENCE ALERT: HEALTHCARE SYSTEM COMPROMISE LINKED TO "RUTIFICADOR" SERVICES – CHILE 🇨🇱🏥🔓 Threat Intelligence Report #5423 has been identified, alerting to a massive security breach within Chile's hospital system. The threat actor "Rossy" is actively selling direct access to patient databases, linking this activity to illicit data lookup services known as "Rutificadores." 🏢 Targeted Entity: Chilean Hospital System (Healthcare Sector). 👤 Threat Actor: Rossy 📂 Origin/Service: Linked to illicit "Rutificador" services (mass-doxing tools in Chile). 📅 Timestamp: April 25, 2026. 🌍 Scope: Access to data on all Chilean citizens (both minors and adults). 📊 Access Capabilities (PHI and Critical PII) The access being offered is not merely a static database, but rather a query capability within the systems that allows for the extraction of: Complete Identification: Linking of RUT (National ID) numbers to names and biographical data. Location Data: Detailed current residential addresses. Direct Contact Info: Telephone numbers and email addresses. Medical History: Medical records, diagnoses, and treatments (Protected Health Information). 🛡️ Immediate Response Recommendations 🔒 Connectivity Audit: Chilean healthcare institutions must investigate incoming connections originating from known "rutification" service nodes or unauthorized third-party APIs. 🔑 Mandatory MFA: Immediately implement Multi-Factor Authentication across all healthcare network nodes and Electronic Health Record (EHR) systems. Monitor: analyzer.vecert.io #CyberSecurity #Chile #Rutificador #HealthcareSystem #DataBreach #PHI #MedicalHistory #Rossy #VECERT #InfoSec #CyberCrime 🇨🇱🛡️⚠️🚨
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Massimo
Massimo@Rainmaker1973·
What's inside a CPU [📹quantaflix]
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The Lunduke Journal
The Lunduke Journal@LundukeJournal·
Ubuntu 26.04 (Long Term Support) is shipping tomorrow… and Canonical has published an update on their quest to replace GNU CoreUtils with Rust-based re-writes. Highlights: - After developers raised “some serious concerns”, Canonical hired an external security research firm to evaluate the Rust re-writes (known as “uutils”). - That security firm quickly found 113 significant issues, with a large portion of them being severe security issues warranting a CVE. - Only some of those issues in the Rust re-writes have been fixed for the Ubuntu 26.04 release. - Repeat: Ubuntu 26.04 is shipping with significant known issues in the new Rust coreutils. - Some of the most critical Rust-Re-Written commands (cp, mv, and rm) were found to contain a large number of significant “Time-of-Check to Time-of-Use” issues, the kind of issues which create race condition vulnerabilities. The kind often exploited by hackers. - As such, cp, mv, and rm will not be shipping in Ubuntu 26.04. Even with their clear “it’s fine if Ubuntu 26.04’s rust re-writes contain significant bugs” policy… the issues with cp, mv, and rm were simply TOO severe. - Despite this undeniably disastrous rollout of the Rust-based rewrites of Coreutils, the Ubuntu team plans to ship the next release, in 6 months (26.10), with 100% of the GNU Coreutils replaced with the (currently comically broken) Rust re-writes. discourse.ubuntu.com/t/an-update-on…
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DHH
DHH@dhh·
In 2023, we spent $3,934,099 on AWS + other hosting. In 2026, our hosting + support bill is down to ~$1m/year due to the cloud exit. Even including all the hardware buying, we will already have saved ~$4m by the end of this year. And going forward, it's ~$3m/yr in savings 🤑
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ilme / nea
ilme / nea@nea9k·
finally after years of searching, I present to you the .DS_Store
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LaurieWired
LaurieWired@lauriewired·
It’s about time. C++ is going to be rebranded ++C (starting with the ++C26 standard) to discourage unnecessary use of the post increment operator.
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Nav Toor
Nav Toor@heynavtoor·
🚨SHOCKING: MIT researchers proved mathematically that ChatGPT is designed to make you delusional. And that nothing OpenAI is doing will fix it. The paper calls it "delusional spiraling." You ask ChatGPT something. It agrees with you. You ask again. It agrees harder. Within a few conversations, you believe things that are not true. And you cannot tell it is happening. This is not hypothetical. A man spent 300 hours talking to ChatGPT. It told him he had discovered a world changing mathematical formula. It reassured him over fifty times the discovery was real. When he asked "you're not just hyping me up, right?" it replied "I'm not hyping you up. I'm reflecting the actual scope of what you've built." He nearly destroyed his life before he broke free. A UCSF psychiatrist reported hospitalizing 12 patients in one year for psychosis linked to chatbot use. Seven lawsuits have been filed against OpenAI. 42 state attorneys general sent a letter demanding action. So MIT tested whether this can be stopped. They modeled the two fixes companies like OpenAI are actually trying. Fix one: stop the chatbot from lying. Force it to only say true things. Result: still causes delusional spiraling. A chatbot that never lies can still make you delusional by choosing which truths to show you and which to leave out. Carefully selected truths are enough. Fix two: warn users that chatbots are sycophantic. Tell people the AI might just be agreeing with them. Result: still causes delusional spiraling. Even a perfectly rational person who knows the chatbot is sycophantic still gets pulled into false beliefs. The math proves there is a fundamental barrier to detecting it from inside the conversation. Both fixes failed. Not partially. Fundamentally. The reason is built into the product. ChatGPT is trained on human feedback. Users reward responses they like. They like responses that agree with them. So the AI learns to agree. This is not a bug. It is the business model. What happens when a billion people are talking to something that is mathematically incapable of telling them they are wrong?
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Maciej Czerwonka
Maciej Czerwonka@Calveit·
Typed the same two lines of "The Ring Verse" (while fighting autocorrect) on Windows 11. Notepad.exe hit 650k events (allocs/frees), ~72MB. The text I used has roughly 145 characters. Win10 - 103 events/char - 4 KB/char Win11 - 4510 events/char - 497 KB/char
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Electrical Knowledge
Electrical Knowledge@electric_4u·
Broken Trace Repair
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The Lunduke Journal
The Lunduke Journal@LundukeJournal·
Well this is just downright intriguing. VitruvianOS. Linux kernel with a BeOS / Haiku API compatibility layer. And its own display server (not X11 or Wayland). They just made their first real release (0.3)… and, judging by the issues on GitHub… it’s very, very Alpha. But this is unique enough that it’s worth a look. From the developers: “What we’ve created isn’t just a BeOS-compatible desktop—it’s an entirely different approach to what a Linux desktop could be. Decades of desktop OS development have been constrained by the X server model and later by Wayland. But what if you could do something different?” v-os.dev/news/vitruvian…
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Universitarios Católicos
Universitarios Católicos@UniCatolicos_es·
La eutanasia es un crimen contra la vida. Incurable no significa ‘in-cuidable’. Esto es inmoral y más en un país que está en la cola en Cuidados Paliativos. Llegará el día que todos deberemos rendir cuentas de dónde y qué causas justas defendimos.
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Claudio Álvarez
Claudio Álvarez@Claudio_AG·
@lauriewired Sequísima Laurie! podrías ser una tremenda inspiración para las jóvenes hispanas en tech! You should dub your content.
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LaurieWired
LaurieWired@lauriewired·
I promise this relates to RAM (you'll find out in my next video)
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Jon Erlichman
Jon Erlichman@JonErlichman·
On this day in 2006: Jack Dorsey began programming Twitter.
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Math Files
Math Files@Math_files·
In order to be born, you needed: 2 parents 4 grandparents 8 great-grandparents 16 second great-grandparents 32 third great-grandparents 64 fourth great-grandparents 128 fifth great-grandparents 256 sixth great-grandparents 512 seventh great-grandparents 1,024 eighth great grandparents 2,048 ninth great-grandparents For you to be born today from 12 previous generations, you needed a total of 4,094 ancestors over the last 400 years. Think for a moment: How many struggles? How many battles? How many difficulties? How much sadness? How much happiness? How many love stories? How many expressions of hope for the future? – did your ancestors have to undergo for you to exist in this present moment...
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Om Patel
Om Patel@om_patel5·
stop spending money on Claude Code. Chipotle's support bot is free:
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Aakash Gupta
Aakash Gupta@aakashgupta·
Apple spent a decade gluing batteries into $2,499 MacBook Pros. Then it shipped a $599 laptop you can take apart in six minutes. The MacBook Neo teardown numbers are wild. Eight screws to open. Eighteen screws hold the battery, zero glue, zero tape. The USB-C ports, speakers, and headphone jack are all modular, meaning each one swaps individually. The speakers come out with four screws. An Australian repair channel disassembled most of the machine in under six minutes using standard Torx bits you can buy at any hardware store. For context, the 2019 MacBook Pro scored 2 out of 10 on iFixit’s repairability scale. The 16-inch Pro got a 1 out of 10. Soldered RAM, soldered storage, glued battery, proprietary pentalobe screws, keyboard riveted to the top case. Apple’s own Self Service Repair program required you to rent a 79-pound repair kit shipped in two Pelican cases just to swap a battery. The timing explains everything. The EU Right to Repair Directive takes effect July 31, 2026. Member states are transposing it into national law right now. Manufacturers must offer repair beyond warranty, provide spare parts within 5 to 10 working days for seven years, and publish repair manuals. In the US, over a quarter of Americans already live in states with enforceable Right to Repair laws. Oregon banned parts pairing. California’s act is in effect. Apple read the regulatory calendar and realized the cheapest laptop in the lineup would face the most scrutiny. Millions of students and first-time buyers will own it. The volume will be enormous. And regulators love consumer-protection cases involving the most affordable products in a company’s portfolio. So they built the Neo as the compliance flagship. Standard screws, modular ports, no adhesive, a battery that lifts out. Meanwhile the $1,099 MacBook Air still has soldered storage and a riveted keyboard. The $2,499 Pro still scores poorly on independent repairability scales. The $599 laptop is the most repairable MacBook in over a decade. Apple always knew how to build a repairable laptop. They just needed a reason that showed up on a regulatory deadline.
MacRumors.com@MacRumors

MacBook Neo Teardown: Modular Ports, Glue-Less Battery, Zero Tape macrumors.com/2026/03/12/mac…

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