Matthew Green

@matthew_d_green

I teach cryptography at Johns Hopkins.

Baltimore, MD
blog.cryptographyengineering.com
Joined January 2010
1,665 Photos and videos Photos and videos

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  1. Pinned Tweet
    29 Jan 2017

    List of non-US contact points for crypto/security PhD applicants (by )

    27 replies 231 retweets 586 likes
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  2. Retweeted
    18 hours ago

    Here's our response to the Kazakhstan government order for HTTPS interception: ?

    26 replies 241 retweets 593 likes
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  3. Retweeted
    19 hours ago

    The year-long rash of supply chain attacks against open source is getting worse via

    1 reply 58 retweets 75 likes
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  4. 19 hours ago

    I’m trying to square “only an extremely small fraction of recordings will be reviewed” with this big scary warning you get when you turn off the setting.

    4 replies 10 retweets 41 likes
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  5. Aug 20

    The mystery of the Bitcoin curve.

    "48ce563f89a0ed9414f5aa28ad0d96d6795f9c62" - Nadia Heninger et al. 99% of repeated Bitcoin ECDSA nonces are the constant (n-1)/2 (n=order of secp256k1). What's weird is that the x-coord. of that times the generatorhas only 160 bits. This is nice for transaction costs. (cont.)
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    1 reply 12 retweets 30 likes
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  6. Retweeted
    Aug 20

    This weird property is shared by all related curves, and does not haooen at random. So it's how the curves are generated, which is not public. The value might be the SHA-1 value of something (with some digits added). Why were so many digits added? Why did they double the point?

    1 reply 3 retweets 10 likes
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  7. Retweeted
    Aug 20

    "48ce563f89a0ed9414f5aa28ad0d96d6795f9c62" - Nadia Heninger et al. 99% of repeated Bitcoin ECDSA nonces are the constant (n-1)/2 (n=order of secp256k1). What's weird is that the x-coord. of that times the generatorhas only 160 bits. This is nice for transaction costs. (cont.)

    2 replies 8 retweets 25 likes
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  8. Retweeted
    Aug 20

    The rump session program is out, using old school formatting and including a few typos still to be fixed

    2 replies 10 retweets 26 likes
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  9. Aug 20

    Ok so this is either going to be awesome or get me fired.

    44 replies 46 retweets 276 likes
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  10. Aug 20

    Reply with suggested titles.

    59 replies 19 likes
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  11. Aug 20

    Resolved: I’m going to teach a Winter Term course called “essential science and hacker movies from 1970-2019”.

    22 replies 16 retweets 140 likes
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  12. Aug 20

    Ok people you all need to go out and watch Real Genius. Seriously. This is not ok.

    10 replies 2 retweets 69 likes
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  13. Aug 20

    If I say “space-based assassination laser” and you’re under the age of 40, you think:

    51 replies 7 retweets 40 likes
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  14. Retweeted
    Aug 19

    dear new grad students starting MA/PhD coursework, the loud male grad students in your seminars who name-drop fancy concepts without explaining them are not smarter than you

    497 replies 17,621 retweets 113,304 likes
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  15. Retweeted
    Aug 19

    We have updated our advertising policies. Going forward, we will not accept advertising from state-controlled news media. Find out more:

    468 replies 910 retweets 1,895 likes
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  16. Retweeted
    26 Nov 2017

    Lately I’ve been divesting djb algorithms from my crypto portfolio and buying into more Rogaway and Bellare

    Owning a diverse crypto-portfolio is now as easy as holding a single token.
    10 replies 36 retweets 182 likes
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  17. Retweeted
    Aug 19

    This cover story by is well worth your time. I really think many people at Google really are trying, but The Company has other priorities. If you're in tech, much of this will ring familiar.

    9 retweets 37 likes
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  18. Retweeted
    Aug 19

    tired of the "successful" talks at CRYPTO? check out the highlights from the CFAIL 2019 PowerPoint Karaoke Duel!

    6 retweets 14 likes
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  19. Aug 19

    Now do I have to learn about Chaldean numerology?!

    16 replies 5 retweets 47 likes
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  20. Aug 18

    I’m hoping it wasn’t a “this is my first time flying a plane” kind of speech.

    19 replies 3 retweets 120 likes
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