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Dear Apple: add “Disappearing Messages” to iMessage right now
This is a cryptography blog and I always feel the need to apologize for any post that isn’t “straight cryptography.” I’m actually getting a little tired of apologizing for it (though if you want some...
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A bit more on Twitter/X’s new encrypted messaging
Update 6/10: Based on a short conversation with an engineering lead at X, some of the devices used at X are claimed to be using HSMs. See more further below. Matthew Garrett has a nice post about...
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Kerberoasting
I learn about cryptographic vulnerabilities all the time, and they generally fill me with some combination of jealousy (“oh, why didn’t I think of that”) or else they impress me with the brilliance of...
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WhatsApp Encryption, a Lawsuit, and a Lot of Noise
It’s not every day that we see mainstream media get excited about encryption apps! For that reason, the past several days have been fascinating, since we’ve been given not one but several unusual...
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Anonymous credentials: an illustrated primer
This post has been on my back burner for well over a year. This has bothered me, since with every month that goes by, I become more convinced that anonymous authentication the most important topic we...
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Anonymous credentials: an illustrated primer (Part 2)
This is the second in a series of posts about anonymous credentials. You can find the first part here. In the previous post, we introduced the notion of anonymous credentials as a technique that...
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Let’s talk about encrypted reasoning
This is a quick post I wanted to write about a hobby project I spent a weekend on. It has little to do with real cryptography, and mostly doesn’t expose a particularly exciting vulnerability. But it...
View ArticleThe future of Siri, or: why private inference isn’t private enough
Yesterday Apple announced a big step towards deploying real AI in their Siri ecosystem. In most ways this is good and inevitable: Siri is one of the world’s most widely-used voice agents, and it would...
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Some thoughts about Anthropic’s new cryptanalysis results
Yesterday Anthropic published two new cryptanalysis results, both outputs of Claude Mythos, their (still) unreleased advanced model. The first of these results attacks a signature scheme called HAWK,...
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Everything is about to “go dark”
I’m coming down from spending a few days at Usenix Security, right here in my hometown of Baltimore. This means that my days have been taken up with two kinds of conversation: first, explaining to...
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