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Lukas Arnold

@lukasarnld.bsky.social

192 followers 140 following 13 posts

Researching iOS' Cellular Protocol Stack @ SEEMOO Studying CS @tuda.bsky.social 🌍 lukasarnold.de

Posts Replies Media

Lukas Arnold @lukasarnld.bsky.social · 08/04/2026

If you are a (cybersecurity) student or early in your career, consider applying at objective-see.org/oftw/v4.html.

objective-see.org

#OFTW v4.0

Empowering students in our community

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Lukas Arnold @lukasarnld.bsky.social · 08/04/2026

The fourth iteration of the „Objective for the We“ event will be held in Berlin at the end of July. Apply to join us for two days of free trainings and talks that teach Apple security research in a beginner-friendly way.

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Lukas Arnold @lukasarnld.bsky.social · 27/10/2025

I just published the slides of my #OBTS v8.0 talk about Apple's #C1 baseband. Our C1 #binja loader is now available on GitHub, and you can find a recording on YouTube. lukasarnold.de/posts/obtsv8...

lukasarnold.de

OBTS v8.0: Diving into C1

Learn more about my talk “What’s at the Bottom of the Sea, One Baseband? - Diving into the C1” at eight edition of the Objective by the Sea conference.

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Lukas Arnold @lukasarnld.bsky.social · 16/10/2025

Thanks for joining my #OBTSv8 talk about Apple's novel #C1 & #C1X basebands. I'm glad to be back at this awesome conference. We'll release the slides and tooling in the coming days.

My first talk slide. It has the title "What’s at the Bottom of the Sea, One Baseband?". The talk was held by Lukas Arnold on the 16th September 2025. The slide includes decorative emojis of the sea floor.

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Lukas Arnold @lukasarnld.bsky.social · 24/07/2025

I‘m glad to be back at #OBTS v8.0 with a talk about Apple‘s #C1 baseband and carrier profiles objectivebythesea.org/v8/talks.htm...

objectivebythesea.org

#OBTS v8.0: Talks

Conference Talks

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Lukas Arnold @lukasarnld.bsky.social · 27/06/2025

So far, we haven't discovered this functionality, but we're in the early stage of researching the C1. The baseband likely contains such an interface, but it may be hard to access. If we have any interesting updates regarding that, I'll share them.

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Lukas Arnold @lukasarnld.bsky.social · 14/06/2025

You install CellGuard with TestFlight or download the special build for jailbroken devices on our website: cellguard.seemoo.de/docs/install/

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Lukas Arnold @lukasarnld.bsky.social · 14/06/2025

We've released CellGuard 1.6.0, our iOS app, to make use of the iPhone's internal baseband communication. The update enhances support for dual SIM, adds new #C1 packet types, automatic navigation to sysdiagnoses, and more: cellguard.seemoo.de/docs/changel...

cellguard.seemoo.de

Changelog

Changelog # 1.6.0 # CellGuard now supports dual SIM setups. When two SIM cards are activated simultaneously, the app can distinguish between their connected cells and packets. We’re working on extract...

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Lukas Arnold @lukasarnld.bsky.social · 25/01/2025

Due to the decentralized @atproto.com architecture, researchers can also collect vast amounts of data from BlueSky. There's an interesting paper from April 2024 about this. It has a whole section about labelers. bsky.app/profile/gare...

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Lukas Arnold @lukasarnld.bsky.social · 28/12/2024

Jiska's first lighting talk at #38c3 will show you how to get started with CellGuard to detect fake base stations

Detecting Fake Base Stations with CellGuard on iOS

Jiska Classen
Joined work with Lukas Arnold, Matthias Hollick, and the CellGuard Team

@neahrdine.bsky.social

Hasso Plattner Institut - Technische Universität Darmstadt - ATHENE (National Research Center for Applied Cybersecurity) - Open6GHub

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Lukas Arnold @lukasarnld.bsky.social · 28/12/2024

You can find the recording of my #OBTS talk about iPhone basebands and Apple Location Services on YouTube: youtu.be/DqOOggWDtes

youtu.be

#OBTS v7: Unraveling the iPhone’s Baseband Architecture to Defend Against Cellular Attacks. L Arnold

YouTube video by Objective-See Foundation

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Lukas Arnold @lukasarnld.bsky.social · 11/12/2024

Thanks! You can rewatch the live stream recording with my talk at www.youtube.com/live/LKzJuEZ.... I guess at some point, there will also be a dedicated video. The slides are up on lukasarnold.de/pdfs/obts7-t....

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Reposted by Lukas Arnold

jiska @naehrdine.bsky.social · 06/12/2024

It's great seeing students I've had the privilege to supervise deliver amazing talks at #OBTS - and for Lina it's even her first conference talk! Check out their recordings on YouTube: youtube.com/@objectiveseefoundation

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Lukas Arnold @lukasarnld.bsky.social · 06/12/2024

Thanks for joining my talk about iPhone basebands at #OBTS #OBTSv7. It’s an awesome experience in Maui, and I’m looking forward to the rest of the conference. You can find the slides at lukasarnold.de/pdfs/obts7-t...

Objective by the Sea v7.0 Trace the Base: Unraveling the iPhone’s Baseband Architecture to Defend Agalnst Cellular Attacks Lukas Arnold - December 5th 2024

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