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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    Hector Martin‏ @marcan42 12 Mar 2020
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    So, the problem with USB tokens that we basically have two choices: - Unauditable black boxes built on *supposedly* more secure ICs that require NDAs to develop for - Open and auditable, but definitely pwnable off the shelf microcontrollers. Which poison do you prefer?

    1:39 AM - 12 Mar 2020
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    • Arnaud Durand Oven Ready Piece of Cake ؜ Dp スーツケース、スーツ、傘、財布を買う Philip Gatzka ~VENEZUELA ES CHUKY~ Cybergibbons Platform Security Summit
    19 replies 16 retweets 50 likes
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      2. Hector Martin‏ @marcan42 12 Mar 2020
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        So far I've favored the first one, because you *know* all those keys based on a random STM32 are going to be glitchable, and closed stuff *might* be better. But after ROCA and other fails, maybe open firmware is better and just hope nobody physically attacks your key?

        3 replies 0 retweets 10 likes
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      3. Hector Martin‏ @marcan42 12 Mar 2020
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        Keep in mind that this depends on your use case, e.g. a key keeping SSH keys needs to be more secure than a key used for FIDO U2F login for a handful of websites, because the latter is a second factor only and easier to revoke/replace.

        2 replies 0 retweets 10 likes
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      4. Hector Martin‏ @marcan42 12 Mar 2020
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        Also keep in mind that open does not mean secure, I've seen some absolutely abysmal firmware in "open" firmware projects along these lines too. I guess what I'm asking is whether it's worth doing #2 "right" with the caveat of being vulnerable to physical attacks.

        3 replies 0 retweets 8 likes
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      2. qxy‏ @qwertxzy 12 Mar 2020
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        Replying to @marcan42

        wasn't that the whole motivation to create the tomu?

        1 reply 0 retweets 0 likes
      3. Thomas Daede‏ @enginetankard 12 Mar 2020
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        Replying to @qwertxzy @marcan42

        The tomu still doesn't have a "secure element".

        2 replies 0 retweets 0 likes
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      2. J‏ @justinrwlynn 12 Mar 2020
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        Replying to @marcan42

        Well, I'd imagine that most people will keep them on them and within their sight at all times. If they can be trusted to revoke the keys if they leave their sight, and if the owner of the key doesn't mind the end user having access - that'd probably be most of the threat model.

        1 reply 0 retweets 1 like
      3. J‏ @justinrwlynn 12 Mar 2020
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        Replying to @justinrwlynn @marcan42

        Using epoxy resin embedding w/ non-conductive glitter and photo identitifcation cards, it should be possible to create a tamper resistant case for microcontrollers which are otherwise physically insecure - given the above.

        1 reply 0 retweets 0 likes
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      2. Hector Martin‏ @marcan42 12 Mar 2020
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        Replying to @videah_

        To an extent yes, but secure elements are supposed to have actual security features (security meshes, voltage/clock monitoring, etc) that typical micros do not.

        2 replies 0 retweets 8 likes
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      1. Matt  🔞‏ @coburn64 12 Mar 2020
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        Replying to @marcan42

        the OSS poison. At least you can work with lots of others to make better firmware etc

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