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Matthew Green Profile picture
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21 Dec, 4 tweets, 1 min read
Oh this isn’t good, Binance. blog.trailofbits.com/2021/12/21/dis… Image
I’m uncomfortable using “1” as an x-coordinate for Shamir, since my stupid intuition tells me “it’s so close to 0” :) But Binance just letting you blast away at q, 2q, etc.
One of my favorite things about cryptocurrency is you never have to say “well the impact can’t be that bad” because you know someone secured like $100m with it.
For the record this is exactly the kind of stupid thing I would have done and it’s why I’m terrified to release code.

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Matthew Green Profile picture
20 Dec
No, no, no, it does not. What is wrong with you people. Stop this. Image
What even is this. You had an explicitly *non-cryptographic RNG* but you’re upset it doesn’t display cryptographic properties!? Image
Rust cryptography task force: wake up and get on top of this before your beloved language gets ruined by idiots who don’t even know what they want.
Read 9 tweets
Matthew Green Profile picture
19 Dec
Does anyone know how Apple’s privacy protocol for AirTags combines with their anti-tracking features? Seems like the two should be incompatible. (I have some guesses but I’m wondering if it’s officially documented.)
My guess is that the AirTag cycles its broadcast pseudonym at a slower rate than your phone can scan, so if your phone detects many broadcasts of the same pseudonym within some time window it says “ah, an AirTag is near me.” And it links this over many windows.
In other words, Apple is taking advantage of a weakness in their anti-tracking protocol to do tracking, in the service of preventing a different kind of tracking.
Read 5 tweets
Matthew Green Profile picture
15 Dec
🧐 macrumors.com/2021/12/15/app…
Pretty confident Apple is going to ditch client-side CSAM scanning in favor of server-side CSAM scanning. This will be an improvement, but will leave them in a tight corner with E2EE.
Still a massive improvement: the deployment of client-side scanning for cloud backups would have been an asterisk on all device privacy forever, particularly as cloud backups become increasingly non-optional.
Read 9 tweets
Matthew Green Profile picture
11 Dec
Watching this log4j bug metastasize, I’m seeing people ask why industry doesn’t fund open source. I don’t have a great answer, but I have some thoughts following the experience with Heartbleed in ‘14. 1/
When Heartbleed dropped, it was very similar to log4j: an underfunded OSS project (OpenSSL) that nobody thought about, but was *everywhere*. It took everyone by surprise, and even woke industry up. The result was a surge of funding. 2/
Industry (not the government, who still though “infrastructure” meant dams and bridges) suddenly realized they were using this stuff everywhere. So the Linux Foundation created the Core Infrastructure Initiative (now the OpenSSF). coreinfrastructure.org 3/
Read 11 tweets
Matthew Green Profile picture
11 Dec
When is “turn off the cloud” no longer a viable option.
I think it’s optimistic that 40% of people think our devices will continue to be useful in the future without a connection to a cloud service.
Ok. I did not phrase this question well so let me try again. At what point do you think our mobile devices will become sufficiently tied to cloud services that “turn off cloud” is no longer an option — either explicitly, or *effectively*.
Read 6 tweets
Matthew Green Profile picture
6 Dec
The HSM universe is a nightmare. It’s genuinely terrible.
It’s like someone at the NSA in 1991 decided what the use-cases and APIs should look like, and nobody ever cared to bring any of it into the 21st century. It’s such garbage.
This is the “use cases” section for Amazon CloudHSM and reading the manual it’s like: yup, that’s pretty much all you could ever do with this garbage API.
Read 5 tweets

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