Why Even Signal Calls Apple & Google (gpn24)

Why Even Signal Calls Apple & Google (gpn24)

Author: CCC media team June 5, 2026 Duration: 46:00
I just wanted Zulip notifications on my phone. So I started building something myself - and fell into a rabbit hole. This talk tells the story of how I tried to solve a problem - and in doing so, understood how push notifications actually work. Why my first approach didn't scale. Why almost every app uses Firebase or APNs. Why even Signal knocks at Google's door. And why, since the Wyden letter of 2023, this is a documented privacy problem: "We kill people based on metadata." I'll show what alternatives exist with UnifiedPush and ntfy, how I built a bridge for Zulip, and why the same problem applies to your Prometheus alerts, Grafana notifications, and CI/CD pipelines. And what all of this has to do with digital sovereignty. Licensed to the public under https://creativecommons.org/licenses/by/4.0/ about this event: https://cfp.gulas.ch/gpn24/talk/38ZLSX/

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Author: Episodes: 100

Chaos Computer Club - recent events feed
Podcast Episodes
Infrastructure Review & Closing (gpn24) [not-audio_url] [/not-audio_url]

Duration: 1:16:35
Große Zahlen und ganz viel WOW Licensed to the public under https://creativecommons.org/licenses/by/4.0/ about this event: https://cfp.gulas.ch/gpn24/talk/MTP7YB/
WAF: Wrong Approach Firewall (gpn24) [not-audio_url] [/not-audio_url]

Duration: 1:01:42
Web Application Firewalls (WAFs) for filtering based on HTTP and payload are omnipresent. In this talk an argument will be made that, in many cases, the wrong approach for implementing WAFs is chosen: They are implemente…
Building video games with 20 year old tech (gpn24) [not-audio_url] [/not-audio_url]

Duration: 19:10
The market is full of high-performance graphics APIs like Vulkan and fantastic engines like Unreal and Unity. So, why not use DirectX 9 and a self-built engine instead? ;) In this talk we'll take a quick stroll down memo…
Three Languages, Triple the Confusion (gpn24) [not-audio_url] [/not-audio_url]

Duration: 20:21
This code runs without errors, but still confuses. In this talk, we explore some subtle quirks of C, Python, and Java (and others) that catch even experienced developers off guard. No bugs, no typos - just the language d…
MMO-CHIP: From Microscope to Verilog in an hour (gpn24) [not-audio_url] [/not-audio_url]

Duration: 58:45
Reverse engineering old custom chips from microscope pictures is cool, but oh so painfully slow! Last time I did this (talk at 38C3), I spent two weeks waking up, annotating wires in Inkscape, going to bed, and then drea…
DI.Days as Anarchist Practice/Anarchist Practices for DI.Days (gpn24) [not-audio_url] [/not-audio_url]

Duration: 44:54
Digital Independence Days are a response to the growing monopolization of technology and the recent loss of trust in US-based tech firms after the USA's shift towards authoritarianism. The (communicated) goal is to prote…