Kaio Rafael

Doctor of Science (DSc.) Interested in Computer Security. Do I need to tell tweets are my own?

[Kaio Rafael @kaiux]

@elonmusk @PeterDiamandis I will never delete this App! Lol

[Hoje no Mundo Militar @hoje_no]

🚨Urgent appeal for Lito Sousa @avioesemusicas, fighting Creutzfeldt-Jakob disease.

Please share this reel far and wide. https://t.co/9otgGSQRhQ

Make sure to tag these institutions who could include him in life-saving trials:

📌@ionis_pharma — Ionis Pharmaceuticals — ION717 trial
📌@broadinstitute — PRiSM trial (NCT07444580)
📌@harvard
📌@mayoclinic

[JS0N Haddix @Jhaddix]

https://t.co/MUsOCCTjfS

[MacSec Labs @MacSecLabs]

macOS Red Team Operator (MRTO) is officially here and the exam is open for booking.

This is not a 90 minute multiple choice test you can brain dump your way through. MRTO is an 8 hour, hands on, enterprise grade macOS Red Team assessment built to mirror what you actually face in the field.

The setup: multi hop infrastructure, an air gapped target, no SSH, no VNC, no easy footholds. You have to move through a real macOS enterprise environment the hard way, the same way advanced threat actors do.

What you are proving that you can operate tradecraft on Apple silicon and macOS endpoints under pressure, without the usual Linux or Windows crutches. Native macOS TTPs. Living off the land. Privilege escalation. Persistence. Lateral movement. Exfiltration. All against hardened, realistic defenses.

If you have been waiting for a macOS specific Red Team certification that actually tests operator skill instead of memorization, this is it.

Book the exam. Clear the assessment. Earn the MRTO.

https://t.co/tZv9A8kFhk

#macOS #RedTeam #ReverseEngineering #infosec #OffensiveSecurity #CyberSecurity #EthicalHacking #PenTesting #SecurityTraining

[Kaio Rafael @kaiux]

Bru, almost $9k USD for a 5-day training? Don’t forget + air ticket + hotel and food. This is c-r-a-z-y or I am really broke.

[Kaio Rafael @kaiux]

@giramex303 @faux_kosinki Actually, that is a very deep question. I liked it.

[Kaio Rafael @kaiux]

I started to ask myself IF humans can really learn faster or by using AI we have an illusion of “learning” while the knowledge retained is shallow. To me sounds like core concepts shouldn’t be a “deliver faster” model just bc AI can answer it. The mental effort is costly and slow

[Andrew Ng @AndrewYNg]

Fifteen years ago, @Coursera and online courses changed education. It worked better than almost anyone expected, expanding access by opening up where you can learn. But how you learn remains largely the same as it has for centuries: it is still one-size-fits-all, taught the same way to each person who shows up.

We now have an opportunity to change how learning happens. With advances in AI, we can now build a custom learning guide for each person. We will turn learning from one‑to‑many to one‑to‑one. I'm starting LearnVector to invent this next generation of learning. We are starting with a $100M investment from Coursera, and plan to collaborate closely with Coursera and Udemy.

Good learning needs much more than just a chatbot. Research shows that chatbots without guardrails harm learning. They help complete tasks and enable students to do better on homework. But cognitive offloading to a chatbot results in them being less skilled. And, you cannot always trust what a chatbot tells you.

In contrast, LearnVector will plan a path with you, adapt to how you learn, and patiently stay with you until you’ve mastered new skills.

One thing has not changed in all this time. People want learning they can trust: material that is accurate, relevant, and worth the effort you put into it. Anything less wastes the most valuable thing a learner has: time. Coursera has a trusted library of materials from authoritative sources. LearnVector plans to work with Coursera to bring this trustworthy learning to everyone. I'm grateful to Greg Hart and the entire Coursera team for supporting LearnVector.

I look forward to working with our talented team to change how we learn, and accelerate human development.

https://t.co/TqFUDFd1hb

[Kaio Rafael @kaiux]

.@Ubiquiti devices are really good, but dear marketing people, just freaking use simple and clear name to your products. What a confusing terminology and bad UX design

[Kaio Rafael @kaiux]

@TheRingsofPower Nice. I really hope this season gets back to track. Great show.

[Cyber Security News @The_Cyber_News]

Yubico has announced the release of YubiKey 5.8, a firmware update that enhances the functionality of hardware-backed passkeys beyond secure login authentication, extending into verified authorization workflows.

This update, announced on July 21, 2026, is designed to support enterprise document signing, digital identity wallets, secure payments, and human approvals for AI-driven actions.

As enterprises face increasing risks from generative AI and autonomous agents, traditional multi-factor authentication methods can verify a user during login.

#cybersecuritynews

[Kaio Rafael @kaiux]

Really cool. CISA do an important job for security defense.

[Cybersecurity and Infrastructure Security Agency @CISAgov]

CISA is hiring! We are looking for the best of the best to help protect our nation’s most critical systems and functions. New positions are regularly being posted. Don’t wait, apply now: https://t.co/arFjUkoBF4

[Sergey Toshin @_bagipro]

The largest vulnerability disclosure in the mobile history!

140 vulnerabiltiies in Samsung preinstalled apps

https://t.co/ag8i86KT44

[Kaio Rafael @kaiux]

I cannot watch more WC games anymore. I really was exited for the 🇺🇸 for the first 35 minutes, but boy … that was really sad :(

[Kaio Rafael @kaiux]

As Brazilian I am not surprised watching the fall on FIFA 2026. Generation after generation of bs of “we are 5 times” world champion. The world has changed and the past glory is f gone.

[Kaio Rafael @kaiux]

Happy 4th of July. 🇺🇸🇺🇸🇺🇸

[Kaio Rafael @kaiux]

@FTFonFS1 @getnickwright “Historic factoid” then history proofs him wrong!

[Kaio Rafael @kaiux]

@GIROTTO Seguro não. Brasil começa adaptar o modelo de controle social da China. Simples assim.

[Kaio Rafael @kaiux]

@ayubio É uma pena. A dominação por uma ideologia já é antiga. Não há tolerância por quem pensa diferente.

[Kaio Rafael @kaiux]

When senior engineer have to handle security alerts during on-call shift!

[(fan) Gonzi @GoonzalezzRM]

pov: entras al vestuario del madrid

[Kaio Rafael @kaiux]

Christ is Risen! Happy Easter