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Update (April 19): Yilei Chen announced the discovery of a bug in the algorithm, which he does not know how to fix. This was independently discovered by Hongxun Wu and Thomas Vidick. At present, the paper does not provide a polynomial-time algorithm for solving LWE. If you’re a normal person — that is, a person who doesn’t obsessively follow the latest cryptography news — you probably missed last
Matthew Green in email November 16, 2020December 10, 2020 2,511 Words I'm a cryptographer and professor at Johns Hopkins University. I've designed and analyzed cryptographic systems used in wireless networks, payment systems and digital content protection platforms. In my research I look at the various ways cryptography can be used to promote user privacy. My academic website Mastodon Twitter Top
A Few Thoughts on Cryptographic Engineering Some random thoughts about crypto. Notes from a course I teach. Pictures of my dachshunds. I'm a cryptographer and professor at Johns Hopkins University. I've designed and analyzed cryptographic systems used in wireless networks, payment systems and digital content protection platforms. In my research I look at the various ways cryptography can be used t
If you’re looking for a nice dose of crypto conspiracy theorizing and want to read a paper by some very knowledgeable cryptographers, I have just the paper for you. Titled “A Riddle Wrapped in an Enigma” by Neal Koblitz and Alfred J. Menezes, it tackles one of the great mysteries of the year 2015. Namely: why did the NSA just freak out and throw its Suite B program down the toilet? Koblitz and Men
Yesterday the New York Times and ProPublica posted a lengthy investigation based on leaked NSA documents, outlining the extensive surveillance collaboration between AT&T and the U.S. government. This surveillance includes gems such as AT&T’s assistance in tapping the main fiber connection supporting the United Nations, and that’s only the start. The usual Internet suspects are arguing about whethe
Last Thursday, Yahoo announced their plans to support end-to-end encryption using a fork of Google’s end-to-end email extension. This is a Big Deal. With providers like Google and Yahoo onboard, email encryption is bound to get a big kick in the ass. This is something email badly needs. So great work by Google and Yahoo! Which is why following complaint is going to seem awfully ungrateful. I reali
Update: I’ve added a link to a page at Royal Holloway describing the new attack. Listen, if you’re using RC4 as your primary ciphersuite in SSL/TLS, now would be a great time to stop. Ok, thanks, are we all on the same page? No? I guess we need to talk about this a bit more. You see, these slides have been making the rounds since this morning. Unfortunately, they contain a long presentation aimed
I just checked the date on my last post and it seems that I haven’t blogged in nearly a month. Believe me, this isn’t for lack of trying. The world has just been a very, very busy place. But this is the Thanksgiving holiday and every (US) American knows the best part of Thanksgiving is sitting around for hours waiting for a huge bird to cook thoroughly enough that it won’t kill your family. And th
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