Microsoft MVP, Code Wrangler/Chief Iceberg Rider and Employee 1.0 @haveibeenpwned, @dotnetfdn member, @stebets@infosec.exchange. He/him
Joined February 2009
- Tweets 15,467
- Following 1,334
- Followers 2,276
- Likes 9,660
1,425 Photos and videos
Pinned Tweet
21 May 2024
It’s official now. I’ll be joining @troyhunt and @Charlotte_Hunt_ later this summer, working full time for @haveibeenpwned!Really excited about this awesome opportunity and I’m very much looking forward to it! 🥳
Massive day for @Charlotte_Hunt_ and I today as we welcome our first ever *proper* @haveibeenpwned employee: @stebets troyhunt.com/have-i-been-pwn…
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Stefán Jökull Sigurðarson retweeted
New stealer log corpus: A collection of hundreds of millions of stealer log records containing 56M unique email addresses has been added. The data also contained 124M unique passwords added to Pwned Passwords. 86% were already in @haveibeenpwned. More: haveibeenpwned.com/Breach/Ju…
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Stefán Jökull Sigurðarson retweeted
Jun 10
New breach: The University of Nottingham was targeted in a ShinyHunters extortion campaign exposing 455k email addresses this week. Data included name, address, phone, ethnicity, disability & academic enrolment info. 47% were already in @haveibeenpwned haveibeenpwned.com/Breach/Un…
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Have I got any friends at @OpenAI that can help get our app submission for @haveibeenpwned through? After many hours of preparation, we're stuck on an endless loop of "This is a required field" without specifying the field, and they're all complete anyway 🤷♂️
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Stefán Jökull Sigurðarson retweeted
The Windows developer experience team wrote the grep implementation in uutils. Everything is being contributed upstream. github.com/uutils/grep
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Stefán Jökull Sigurðarson retweeted
This was nice rider GitHub Copilot but having basically one working day of usage for such price is just not acceptable, time to move on.
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Stefán Jökull Sigurðarson retweeted
Jun 1
What's better than writing a book about GC? Writing a GC! I am excited to share that I've joined Microsoft as Principal Software Engineer, to work on the evolution of the .NET Garbage Collector and in general the future of the .NET runtime. Stay tuned for much more!
After my two-year detour into agentic AI, and my deep .NET background, I find it a perfect match for today's evolution of .NET and serving heavy AI workloads. The intersection of AI with low-level programming and hardware-aware algorithms is a great place to be. Not to mention AI-assisted work and engineering is already deep in my heart.
#dotnet 💜
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Current status after less then 24 hours of GitHub Copilot usage (Pro subscription) with the new usage-based billing. I haven't even done any really complex work yet.... I have a feeling I'll be going somewhere else pretty soon. Been using GPT 5.4 today.
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1,000 data breaches!
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That's a massive milestone - 1,000 breaches processed in @haveibeenpwned - and it got me wondering why the service is still needed? But you don't have to look far to see why: troyhunt.com/1000-data-breac…
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Found a need to calculate cryptographic hashes for strings a lot and all the online tools sucked so I wrote my own and published as @Cloudflare Pages app. Simple and gets the job done: hashes.stebet.net
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Also, @GitHub Copilot has a come a long way since I first started using it and made this so much easier and faster to do. UI, GiHub Actions and Cloudflare Wrangler setup was done in minutes instead of hours.
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May 22
I'm thrilled to release CodeAlta - one of the first efficient AI coding-agent TUIs built entirely in C#/.NET 🚀
I've been developing and using it daily for the past 3 months, and I hope you enjoy it as much as I do! 🤗
Retweets are highly appreciated! 🙏
CodeAlta brings you a beautiful, colorful timeline interface, multiple threads in the same workspace, a real prompt editor experience, quick file viewing/editing with syntax highlighting, in-app model provider configuration, a multi-agent-ready environment, and much more! ✨
ALT Screenshot of the CodeAlta tui
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Stefán Jökull Sigurðarson retweeted
May 21
Passkeys are supposed to be browser-enforced security.
But what happens when a browser extension can step into the WebAuthn flow and bypass the rules your site explicitly set?
I dug into 1Password, Permissions Policy, and a questionable edge case:
scotthelme.co.uk/passkeys-pe…
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Stefán Jökull Sigurðarson retweeted
May 19
I didn't realise it was so trivial for an XSS vulnerability to allow an attacker to register their passkey on your account!
scotthelme.co.uk/xss-is-dead…
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Stefán Jökull Sigurðarson retweeted
May 15
It's not OpenCode but it's called CodeAlta 😁 entirely written in C#, multi-sessions, multi-threaded, multi-model-providers, single file C# plugins, fast TUI, ... and fully OSS, coming soon! 🚀
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Stefán Jökull Sigurðarson retweeted
May 15
Want to tell the product team what's missing in Windows before a feature ships, not after? We're opening that channel. Direct access, real research, your voice in the room. Sign up: aka.ms/windows-listens
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Stefán Jökull Sigurðarson retweeted
Why do people think this is the only thing MS is doing to fix lags in the Windows UX? Has anyone though they might actually also optimize code? Or that this might be an opt-in mechanism to make stuff that will be faster due to code optimizations even faster? Think people!
Microsoft is working on a special new performance boost feature for Windows 11 that sources say will speed up app launches by up to 40%.
According to our sources, Microsoft is now testing a new "Low Latency Profile" feature for Windows 11 that will max out CPU frequency in short bursts whenever users open an app or system flyout.
This is said to make the OS much snappier, with some apps seeing up to a 40% performance improvement at launch, and system flyouts up to 70%. More info at the link. windowscentral.com/microsoft…
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Stefán Jökull Sigurðarson retweeted
May 9
There are actual things wrong and smart people are working to fix them, but a lot of this negativity is computer science enthusiasts without experience in computer science making assumptions based on their intuition
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Why do people think this is the only thing MS is doing to fix lags in the Windows UX? Has anyone though they might actually also optimize code? Or that this might be an opt-in mechanism to make stuff that will be faster due to code optimizations even faster? Think people!
Microsoft is working on a special new performance boost feature for Windows 11 that sources say will speed up app launches by up to 40%.
According to our sources, Microsoft is now testing a new "Low Latency Profile" feature for Windows 11 that will max out CPU frequency in short bursts whenever users open an app or system flyout.
This is said to make the OS much snappier, with some apps seeing up to a 40% performance improvement at launch, and system flyouts up to 70%. More info at the link. windowscentral.com/microsoft…
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Also, Microsoft can't fix 3rd party code, but they can do things like this to make them faster so everyone wins.
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