Leighton Sheppard

[Leighton Sheppard @leight0n]

@Babywwir Literally all 20! 🤣

[Leighton Sheppard @leight0n]

Experiencing suppression with this account. If you see this, do me a favor, just drop a comment. Thanks.

[Leighton Sheppard @leight0n]

@EliAfriatISR Yarp!

[Science girl @sciencegirl]

True strength is born the moment we have something beyond ourselves to protect https://t.co/wy3yJsRXde

[Leighton Sheppard @leight0n]

@EliAfriatISR Happy Birthday :)

[NASA Artemis @NASAArtemis]

Signal acquired! 📡

Engineers at @NASAJPL have confirmed that the Orion spacecraft is communicating with the Deep Space Network. For the first time in over 50 years, we’re receiving a signal from a spacecraft carrying humans toward the Moon.

[Dave W Plummer @davepl1968]

How to write a great kernel:

- Write a brain-dead simple kernel
- Improve it a bit
- Repeat for 30 years
- Success!

[Leighton Sheppard @leight0n]

@VividProwess ♥️

[Stephen Sims @Steph3nSims]

I want to share a quick thought for people in cyber security. This will be my longest tweet ever.

I’ve spoken to many lately who are having an existential crisis from the constant posts about “the end of cybersecurity jobs.”

Yes, things are changing quickly. This is a significant moment for the tech industry. Change can be uncomfortable. But we’ve seen cycles like this before.

• When GitHub and open source took off, people said software engineers would disappear because code was free.
• When AWS and cloud computing emerged, people said infrastructure jobs would vanish.
• When fuzzing and SAST tools improved, people said vulnerability research would disappear.
• Virtualization would eliminate infrastructure jobs.
• Mobile computing was going to end desktop dev.
• Exploit mitigations would end exploitability. It didn't.

Each time automation improved, the amount of software grew faster than the automation. It does feel "different" this time as it's explosive.
Some roles will shrink:
• repetitive pentesting
• basic vulnerability scanning
• tier-1 SOC monitoring

But other areas are expanding rapidly:

• AI system security
• supply chain security
• identity architecture
• autonomous agent security
• critical infrastructure protection

Historically, every time we eliminate one class of bugs, new classes emerge. Right now people are vibe-coding entire systems, giving AI access to their machines, crossing trust boundaries, and deploying autonomous agents with excessive permissions. The legal and regulatory world is nowhere close to ready.

There will absolutely be new failure modes. Humans are amazing and always adapt, finding new ways to do things.

The worst thing you can do right now is fall into a doom loop.

...and I’ll be honest, I too have felt the "psychological paralysis" a few times thinking, “Is this time different?” It's especially impactful when it comes from someone I respect in the community. There are certainly unknowns, in an industry where we've become accustomed to predictability.

But... the majority of those reactions are usually driven by social media, not reality. Platforms like X reward engagement, and sensational doom posts spread faster than measured thinking.
If you see something like:
“Holy #$%^! Opus 66.6 just found every bug in Chrome and replaced 50 startups!”

…mute it and move on.

Instead:

Stay curious.
Learn the new technology.
Adapt your skillsets.
Build things.

We’ll get through this transition the same way we always have. If I'm wrong then Sam Altman better be right about UBI! :) I'm sure that if this tweet gets any engagement that I'll get some heat for it, but a good friend of mine reminds me often to focus on what you have control over. I'll revisit this tweet at DEF CON 40!

[Richard Donaldson @RDonaldson91]

Two hours ago I launched my petition. It is currently the fastest growing petition in the UK and has already hit 10,000 signatures.

Thank you so much.

Terrorist must NOT be allowed to stand for public office in the UK.

[Elon Musk @elonmusk]

Yes

[Leighton Sheppard @leight0n]

Great posts - you should follow @ProudofusUK

[Proudofus.uk @ProudofusUK]

There's a door in England.🚪🏴󠁧󠁢󠁥󠁮󠁧󠁿

It's been there for nine hundred years. And on that door is a knocker.

If you grabbed it, the law couldn't touch you.⚖️

Durham Cathedral. Built in 1093. From the moment it was finished, a rule was carved into its stone.

Anyone who reached that knocker was protected. Thirty-seven days. No one could arrest you. No one could harm you.

Two monks sat in a room above the door. Day and night. Every hour. Listening for a knock.

Because when it came, they had to open the door.

They gave you a black gown. A yellow cross on the chest. A bed. Food. And for thirty-seven days, safety.
After that, you had a choice. Face trial. Or leave England forever.

They called it abjuring the realm. Walk to the coast carrying a cross. Never leave the road. Board a ship. Never come back.

Over three hundred people claimed sanctuary. Murderers. Thieves. Debtors. All given the same protection.

The right of sanctuary ended in 1623.

But the knocker never came down.

It's still on the door at Durham Cathedral. Nine hundred years old. Still holding the ring that saved three hundred lives.

England built mercy into its architecture. Into the stone. Into the door. Into a ring that anyone could grab.

Be part of us. https://t.co/hVV3lUyvrZ

Be Proud Of Us. 🇬🇧

[mRr3b00t @UK_Daniel_Card]

Red Teaming: UK MOD Style:
https://t.co/vhM2AtEKMM

[Collin Rugg @CollinRugg]

NEW: The Sagrada Familia basilica in Barcelona, Spain, has officially reached its maximum height after being under construction for 144 years.

A 55-foot-tall white cross now stands at the top of the Tower of Jesus Christ.

The basilica now stands at a soaring height of 566 feet.

The Sagrada Familia was designed by Antoni Gaudífirst and the first stone was placed in 1882. The basilica's full completion is not expected for another decade.

As designed by Gaudí, who passed away in 1926 at the age of 73, the cross at the top has four arms so it can be recognized from any direction.

Beautiful.

[Oliver Prompts @oliviscusAI]

the cybersecurity industry is about to get completely disrupted.. 💀

someone just open-sourced a fully autonomous AI Red Team.

it’s called PentAGI. multiple AI agents that talk to each other to hack a target. zero human input.

[All day Astronomy @forallcurious]

🚨: The most important sky events of this decade is occurring on February 28th. 🌌 ✨

Six planets will align and put on a show of our lifetime. Mercury, Venus, Jupiter and Saturn will be visible to the naked eye from almost anywhere.

Uranus and Neptune will be visible to naked eye if seen from dark places.

MARK YOUR CALENDERS; February 28th. 📅✨

[Leighton Sheppard @leight0n]

@Lord_Sugar Loved it, looking forward to the rest of the series!

[Black Hole @konstructivizm]

Don't Miss ! On January 23, 2026, the night sky will deliver a rare and delightful cosmic moment. The Moon will curve gently beneath Saturn and Neptune, forming a natural “smiley face” high above Earth. This triple conjunction happens when all three celestial bodies appear close together from our viewpoint, creating a brief but magical alignment.
It’s a reminder that space isn’t always distant and serious sometimes, it feels playful too. If skies are clear, look up and enjoy this once-in-a-long-while celestial smile lighting up the darkness.

[The Figen @TheFigen_]

Our minds are perfect.

Were you able to read these words?