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patio11's profile
Patrick McKenzie
Patrick McKenzie
Patrick McKenzie
@patio11

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Patrick McKenzie

@patio11

I work for the Internet, at @stripe, mostly on accelerating startups. Opinions here are my own.

東京都 Tokyo
kalzumeus.com
Joined February 2009

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    Patrick McKenzie‏ @patio11 21 May 2019
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    This keeps happening to cryptocurrency enthusiasts, but is a well-worn attack within the capabilities of a non-technical teenager. https://medium.com/coinmonks/the-most-expensive-lesson-of-my-life-details-of-sim-port-hack-35de11517124 … Take your phone number off your Gmail/etc accounts and use hardware or TOTP 2FA.

    1:32 AM - 21 May 2019
    • 58 Retweets
    • 174 Likes
    • George V. Reilly Jib L@DO BWD Neil Montes (Data Commune & TheNeuroMarketer) 💫🍕 😷 Scott Swezey Rajesh Arasu Yaoyu Yang
    5 replies 58 retweets 174 likes
      1. New conversation
      2. Patrick McKenzie‏ @patio11 21 May 2019
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        Incidentally, while the cryptocurrency community provides easy one-stop-shopping for high-value targets, once criminals develop a business process to exploit this they could plausibly expand into adjacent markets. This *very much* includes startup founders, etc.

        2 replies 0 retweets 14 likes
        Show this thread
      3. Patrick McKenzie‏ @patio11 21 May 2019
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        Ideally you do business with financial institutions which will not just give all the money irreversibly to anyone capable of spoofing your cell phone but strongly consider defense-in-depth against attacks like this. Some friends/acquaintances of mine had near misses to similar.

        1 reply 0 retweets 15 likes
        Show this thread
      4. Patrick McKenzie‏ @patio11 21 May 2019
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        At the risk of getting close to socially contentious topics: there exist *some* banks and brokerages which will respect an account note "No account actions or transfers above $Xk unless I am standing in front of you in the office." You may want that service level someday.

        3 replies 0 retweets 32 likes
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      5. Patrick McKenzie‏ @patio11 21 May 2019
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        "Can you recommend any?" Socially contentious because of the nature of my job, but in most futures where you wake up with atypical amounts of money in an account you'll also know at least one person who has been dealing with your threat model for years. Ask them for a rec.

        2 replies 0 retweets 15 likes
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      6. End of conversation
      1. New conversation
      2. Max Tagher‏ @MaxTagher 21 May 2019
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        Replying to @patio11

        We use TOTP exclusively at @BankMercury and it’s worked out fairly well so far. Still I think the 2FA offerings need improvement: 1. Google Authenticator doesn’t do backup, which surprises people and makes getting a new phone a pain in the butt

        2 replies 0 retweets 5 likes
      3. Patrick McKenzie‏ @patio11 21 May 2019
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        Replying to @MaxTagher @BankMercury

        Lifecycle management at scale is the hardest problem in 2FA, a point which Stamos made a million times and which technologists underappreciate.

        0 replies 0 retweets 5 likes
      4. End of conversation
      1. New conversation
      2. Patrick McKenzie‏ @patio11 21 May 2019
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        Replying to @samsaragon

        Google Authenticator is a TOTP, so acceptable for this purpose, as long as you can't end-run it with an SMS/etc.

        0 replies 0 retweets 0 likes
      3. End of conversation
      1. Kia‏☆‏ @alt_kia 21 May 2019
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        Replying to @patio11

        SIM/number-porting fraud is horrific and i really do hope phone companies come up with some seriously effective technical countermeasures against it; the idea that impersonating me via mobile-phone is O(finding a sufficiently gullible/rushed customer service agent) is terrifying

        0 replies 0 retweets 9 likes
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      1. New conversation
      2. tommy boy‏ @tomkarlo 21 May 2019
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        Replying to @patio11

        💯... SMS verification is effective against random / automated attacks, but not considered particularly useful against targeted attempts. Google itself recommends hardware-based 2FA for anyone likely to be the subject of a targeted attack.

        1 reply 0 retweets 1 like
      3. Jason Hsu‏ @jashsu 21 May 2019
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        Replying to @tomkarlo @patio11

        Another low-hanging fruit: Gmail should not allow certain account recovery emails to be deleted for N days.

        0 replies 0 retweets 1 like
      4. End of conversation

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