Lukas Arnold

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.

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...

27.10.2025 15:48 — 👍 4    🔁 1    💬 0    📌 0

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.

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.

16.10.2025 10:58 — 👍 2    🔁 0    💬 0    📌 0

#OBTS v8.0: Talks Conference Talks

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...

24.07.2025 18:42 — 👍 0    🔁 0    💬 0    📌 0

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.

27.06.2025 08:39 — 👍 1    🔁 0    💬 0    📌 0

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

14.06.2025 18:40 — 👍 0    🔁 0    💬 0    📌 0

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...

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...

14.06.2025 18:40 — 👍 5    🔁 1    💬 2    📌 0

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...

25.01.2025 17:51 — 👍 2    🔁 0    💬 0    📌 0

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

28.12.2024 09:24 — 👍 5    🔁 2    💬 0    📌 0

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

28.12.2024 09:07 — 👍 2    🔁 0    💬 0    📌 0

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....

11.12.2024 20:32 — 👍 0    🔁 0    💬 0    📌 0

Lukas Arnold - Trace the Base

Lina Wilske - Unraveling Time

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

06.12.2024 10:35 — 👍 10    🔁 3    💬 1    📌 0

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

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...

06.12.2024 01:45 — 👍 10    🔁 1    💬 2    📌 1