Matthew Dempsky

@mdempsky

Security, Go compiler engineer. Cog in the Google machine. Crypto means cryptography. Tax the rich. Ⓥ🌹

San Francisco, CA
Vrijeme pridruživanja: travanj 2009.

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  1. proslijedio/la je Tweet
    2. velj

    Hm starting to notice a pattern here

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  2. proslijedio/la je Tweet

    Pela primeira vez, uma grande pesquisa nacional (da NBC News) mostra Bernie Sanders liderando todos os seus concorrentes - incluindo Joe Biden - em todo o país. As pessoas estão começando a acreditar que Bernie tem uma chance real e séria de vencer.

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  3. 31. sij

    Juicero but with Blockchain. VC money please. 🤲

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    BREAKING: 30 and members are refusing to leave ’s statewide headquarters in Des Moines over his lies about and his ties to the insurance company CEOs who are funding his campaign.

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    1/ Hundreds of us decided to stand up to our employer, Amazon. We are scared. But we decided we couldn’t live with ourselves if we let a policy silence us in the face of an issue of such moral gravity like the climate crisis.

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    24. sij
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    24. sij

    ‘Governments worldwide are threatening peaceful activists with massive fines, prison time, and physical violence.’ — Here’s how ‘ag-gag’ laws hurt animals, target activists, and prevent transparency to protect the massive farming industry

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  8. 22. sij
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  9. 18. sij

    Started reading about Ur/Web last night. Unified, type-safe programming model for building web applications. Browser, server, and database logic all generated from a single codebase. Seems interesting.

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    Women in New York Protest Against Accused Rapists Harvey Weinstein & President Trump

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    It's hard for me to get too excited about this: * Drummond was allowed to resign with 3 weeks notice (the thing they told was against policy), while organizers like myself were fired. * Drummond sold nearly $220 million in stock since the beginning of November 1/6

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  12. 9. sij

    Evidently, J. Perlinger identified this issue and wrote their own alternative strictly conforming implementation for NTP (though never reported it back upstream to OpenBSD as far as I can tell 😢):

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  13. 9. sij

    Notably, my solution isn't strictly conforming C code: it depends on signed integer representation (two's complement) and right-shift behavior for negative values (sign extension). However, this is the implementation-defined behavior used by GCC:

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  14. 9. sij

    I added it to OpenBSD back in 2014. I'm not particularly fond of the API, but I was told it was important, and implementing memcmp semantics without branching based on memory contents was a fun little puzzle (warning: spoilers):

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  15. 9. sij

    Apparently Solaris added timingsafe_memcmp in 2018:

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  16. 9. sij

    Discussion with a coworker who didn't realize he was credited by the PKCS#11 spec led me to discover I'm credited by POSIX:

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  17. 8. sij
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  18. 4. sij
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  19. 2. sij

    "No longer can massive tech companies like Google be permitted to operate relatively free from government oversight."

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  20. proslijedio/la je Tweet
    31. pro 2019.

    beware the 2020 length-extension time-travel attack: if you write a date as 01/02/20, someone could edit it to 01/02/2010 etc. the attack is practical and requires negligible memory

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