Welcome to the Tech Meam ride home from Monday, April 13th, 2020. I'm Brian McCullough today.

Deeper dives into that Google Apple Contact Tracing Project, solid rumors about the new iPhone

design, the telecom industry might lose 25 billion dollars this year and

international roaming charges are to blame. And an open source live streaming and video

streaming app that can help you twitch and YouTube better without being beholden

to their tools. Here's what you missed today in the world of tech. The chatter and analysis of Google and Apple stepping in to

provide a technological solution for the contact tracing that'll be necessary for the

next phase of the coronavirus crisis continued all weekend.

And we got some new details from the companies

about how this all will work.

Apple, for example, says that the anticipated apps can include

duration of proximity as a vector when deciding what actually constitutes a proximity event, thereby hopefully limiting false positives.

Signal Creator Moxi Marlon Spike explained further how this all might work in practice.

Once a day your device derives a new key, a daily tracing key.

It then uses that to derive a new proximity ID every time your device's Bluetooth address changes every 15 minutes or so which is broadcast to nearby Bluetooth sensors.

Your device then keeps track of all proximity IDs it sees. If someone tests

positive and they choose to publish their previously secret daily tracing

keys, your device frequently downloads all published daily tracing keys and

KDFs to see if they match recorded proximity IDs. So first obvious caveat is

that this is private or at least not worse than BTLE until the moment you test positive.

At that point all of your BTLE MAC addresses over the previous period become linkable. Why do they change to begin with?

Because tracking is already a problem. So it takes BTLE privacy a step back. I don't

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