Impressum

Angaben gemäß § 5 TMG:

Jiska Classen
Pankratiusstr. 2
64289 Darmstadt

Kontakt:

jiska at bluetooth punkt lol

Verantwortlich für den Inhalt nach § 55 Abs. 2 RStV:

Jiska Classen

Comments

Post a Comment

Popular posts from this blog

Reverse Engineering iOS 18 Inactivity Reboot

Image
Reverse Engineering iOS 18 Inactivity Reboot iOS 18 introduced a new inactivity reboot security feature. What does it protect from and how does it work? This blog post covers all the details down to a kernel extension and the Secure Enclave Processor. Security Before First Unlock / After First Unlock Did you know that entering your passcode for the first time after your phone starts is something very different then entering it later on to unlock your phone? When initially entering your passcode, this unlocks a key store in the Secure Enclave Processor (SEP) that encrypts your data on an iPhone. The state before entering your passcode for the first time is also called Before First Unlock (BFU). Due to the encrypted user data, your iPhone behaves slightly differently to later unlocks. You'll see that Face ID and Touch ID won't work and that the passcode is required. But there's more subtle things you might notice: Since Wi-Fi passwords are encrypted, your iPhone won't co...
Read more

Always-on Processor magic: How Find My works while iPhone is powered off

Image
Update: We wrote a paper with even more technical details :) iOS 15.0 introduces a new feature: an iPhone can be located with Find My even while the iPhone is turned "off". How does it work? Is it a security concern? I saw this feature rather early on one of my iPhones with an iOS 15 beta. Here's a screenshot I took in July. The user interface changed a little bit since then. It took a bit longer until the public realized this feature exists. One needs to update to iOS 15.0, use an iPhone that has location services enabled, a logged in user account, participates in the Find My network, etc. And the weirdest thing nobody does these days: One has to turn the iPhone off. But once Twitter found out, this took off. And so did the rumors how this was implemented. Apple's Always-on Processor (AOP) There's only little public documentation about the AOP. All chips and various embedded devices Apple manufactures run a real-time operating system, called RTKitOS. The AOP on ...
Read more

BlueZ: Linux Bluetooth Stack Overview

Image
Found some time for another Bluetooth rant :) This time it's going to be about BlueZ , the Linux Bluetooth stack. Note that there are other Bluetooth stacks for Linux such as BTstack , but I didn't find the time to play around with these, and BlueZ is still what you get these days if you install a normal Linux distribution. This is my view on about BlueZ and a couple of things might be over-simplified. Feel free to add comments to this post if anything is wrong or is better explained elsewhere. However, I found that there is no good overview from a programming and hacking perspective, and often times I get questions about patching certain things within InternalBlue that have a root cause deep down in the Linux kernel. BlueZ is missing documentation. In fact, I ended up using dynamic debugging here and there to understand which functions are still called and which are deprecated. Otherwise, this blog post would not be needed for an open-source project m) Linux Bluetooth stack vs...
Read more