Matthew Green

I teach cryptography at Johns Hopkins. https://blog.cryptographyengineering.com (#matthew_d_green on the other site.)

Public Key

npub1tsr0tzpcqxta5h0mut3jj29ekmvzcck6crrqy566p8hpet26sgss5g4v4e

NIP-05 Address

matthew_d_green_at_ioc.exchange@mostr.pub

Profile Code

nprofile1qqs9cph43quqr976tha79cef9zumdkpvvtdvp3sz2ddqnmsu44dgyggpz4mhxue69uhhyetvv9ujumt0wd68ytnsw43qtyf4v6

Publishing to

relay.mostr.pub

Author Public Key

npub1tsr0tzpcqxta5h0mut3jj29ekmvzcck6crrqy566p8hpet26sgss5g4v4e

Show more details

Last Notes

2024-08-11 14:55:23

Do people who live in Europe ever have to grapple with this insanity? I’ll move tomorrow if the answer is “no”.
https://files.ioc.exchange/media_attachments/files/112/943/963/543/951/636/original/895916d02b65b520.jpeg

2024-08-01 16:18:58

I am glad some of the “watermarking for LLMs” mania is dying down.

2024-03-31 15:36:37

This thing Facebook did — running an MITM on Snapchat and other competitors’ TLS connections via their Onavo VPN — is so deeply messed up and evil that it completely changes my perspective on what that company is willing to do to its users.

2024-03-21 00:11:00

The weirdest thing about 2024 is the rapid rollout of unconstitutional age verification laws for websites, and how little the “free speech” tech crowd seems to care about this.

2024-02-09 15:25:06

Makes the whole job worthwhile.
https://files.ioc.exchange/media_attachments/files/111/902/215/487/615/514/original/9c228810e9a5dafa.jpeg

2023-10-21 04:05:49

My daughter received an invitation for a Bar Mitzvah with a “World War II theme.” What am I supposed to do with this.

2023-10-18 11:42:59

- reply

It’s amazing to me that a proposal to scan *literally ever private communication in Europe* is barely making newspapers, and we’re reading about legislative progress on blogs.

2023-10-18 11:29:17

The EU chat control legislation has been temporarily postponed. That’s good news. The bad news is there’s another vote in December. https://www.patrick-breyer.de/en/chat-control-vote-postponed-huge-success-in-defense-of-digital-privacy-of-correspondence/

2023-10-02 13:21:39

- reply

But all this data had to be authenticated, to keep bad guys from broadcasting false data and screwing up traffic. At the same time, the crypto used had to preserve *privacy* so you couldn’t use it to track cars. You also needed the ability to revoke signing authority.

2023-10-02 13:21:21

- reply

The idea was that every car would constantly broadcast a message containing its GPS coordinates and speed, so every other car on the road would be able to do stuff like… I don’t really know. Avoid rear-ending other people? Also traffic lights and road signs would also broadcast.

2023-10-02 13:21:00

We don’t talk about it ever, but did you know the US built an entire “private” CA infrastructure for vehicle-to-vehicle communications and a few cars even launched with the capability, before everyone involved decided to scrap the idea?

2023-09-25 13:31:50

Do read this new investigatory piece on the web of money, AI companies, and shadowy “foundations” bankrolling the EU anti-encryption proposals. TL;DR this is the terrifying thing you get when you combine law enforcement, money and AI. https://balkaninsight.com/2023/09/25/who-benefits-inside-the-eus-fight-over-scanning-for-child-sex-content/

2023-09-23 16:01:15

https://files.ioc.exchange/media_attachments/files/111/115/295/911/980/833/original/689a5f24e43e2966.jpeg
https://files.ioc.exchange/media_attachments/files/111/115/296/561/835/609/original/224cf80cf34128d0.mp4

2023-09-19 13:11:18

New leak from the Snowden archive.
https://files.ioc.exchange/media_attachments/files/111/091/978/932/359/373/original/c4b6ae1e8f0fa11f.png

2023-09-01 11:43:15

- reply

@npub1x2u…3j8v What’s that a reference to?

2023-09-01 01:32:28

This article with quotes from Apple on why it killed the CSAM photo scanning initiative is the first thing I’ve seen from the company explaining their decision. https://www.wired.com/story/apple-csam-scanning-heat-initiative-letter/
https://files.ioc.exchange/media_attachments/files/110/987/309/453/405/699/original/50c84ba0b528e3c4.png
https://files.ioc.exchange/media_attachments/files/110/987/309/543/639/460/original/06d101fd76ed21d5.png

2023-09-01 01:31:26

It’s days like these you realize the human brain is a computer that runs on about five ounces of weird chemicals, and if you use it too much they all run out.

2023-08-22 05:22:38

I wrote a blog post about Worldcoin. https://blog.cryptographyengineering.com/2023/08/21/some-rough-impressions-of-worldcoin/

2023-08-17 02:46:29

Really wish this place had search.

2023-07-29 14:26:45

Some folks on HN were confidently asserting that Apple escrows its encryption keys with Chinese-government owned hosting providers “to facilitate mass surveillance.” This statement is messy because it’s 1/4-true, 1/4-false, 1/2 unknown. https://www.nytimes.com/2021/05/17/technology/apple-china-censorship-data.html?smid=nytcore-ios-share&referringSource=articleShare

2023-04-25 00:52:01

- reply

If you had the most cynical possible view of humanity and its governments, you’d expect government agencies to be making a *huge* push to end encryption right now; or at least adorn it with mass-scanning infrastructure. And sure enough, that’s exactly what we’re seeing all around the world. https://www.globalencryption.org/2023/04/statement-on-eu-us-cooperation-against-encryption/

2023-04-25 00:49:50

- reply

Many folks in law enforcement and politics seem genuinely confused about the popularity of end-to-end encrypted messaging, like we all just decided to become anarchists or something. That’s not at all the dynamic we’re seeing here. The entire basis of our communications infrastructure shifted in a direction that’s inimical to privacy; encryption is the obvious solution.

2023-04-25 00:44:39

It is remarkable to think that only in the past 15-20 years have we moved most of our private communications to digital channels with centralized storage & the processing power to perform bulk scanning. Coincidentally that’s nearly as long as encrypted messaging has been around.

2023-04-03 12:21:27

- reply

May be redundant to say, but in a world with proper encryption and good key management: you could store your data anywhere you want and this never happens to you.

2023-04-03 12:20:37

I really don’t know why you’d store your data in a cloud operated by Western Digital. But if you did, you’re in trouble. https://www.bleepingcomputer.com/news/security/western-digital-discloses-network-breach-my-cloud-service-down/

2023-03-07 13:40:40

- reply

#[0] Yup.