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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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    1. Hector Martin‏ @marcan42 9 Oct 2018
      • Report Tweet
      • Report NetzDG Violation

      Hector Martin Retweeted Tavis Ormandy

      Ahahaha, WTF is this thing? USB MITM to restrict device classes to a whitelist? LOL.https://twitter.com/taviso/status/1049721887578681344 …

      Hector Martin added,

      Tavis OrmandyVerified account @taviso
      Apparently this is the product Bloomberg's source is selling, I had to find the specs on http://archive.org , because their website doesn't work. What even is this... 🤪https://web.archive.org/web/20170721190725/http://www.sepio.systems/assets/Sepio_Data_Sheet.pdf …
      1 reply 2 retweets 25 likes
      Show this thread
    2. Hector Martin‏ @marcan42 9 Oct 2018
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      Also I like the 2W power consumption spec. That's 80% of the available power on a standard USB port. I guess your keyboard gets the remaining 20%. Better not have any RGB LEDs on it.

      1 reply 0 retweets 15 likes
      Show this thread
    3. Tavis Ormandy‏Verified account @taviso 9 Oct 2018
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      Replying to @marcan42

      Galvanic isolation is my new favourite term. I'm going to waste all day hassling people in Chrome asking why the sandbox isn't using galvanic isolation.

      3 replies 0 retweets 20 likes
    4. Hector Martin‏ @marcan42 9 Oct 2018
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      Replying to @taviso

      It's a real term... the kind of thing you might want in a medical device, or a RS485 network. They seem to think it matters for a USB keyboard, somehow.

      3 replies 1 retweet 3 likes
    5. Karl‏ @supersat 9 Oct 2018
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      Replying to @marcan42 @taviso

      presumably to stop side-channel attacks like this: https://www.usenix.org/conference/usenixsecurity17/technical-sessions/presentation/su … but you still need to power the KB so ¯\_(ツ)_/¯

      1 reply 0 retweets 0 likes
    6. Karl‏ @supersat 9 Oct 2018
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      Replying to @supersat @marcan42 @taviso

      sure, you could convert the DC to AC and pass it through a transformer, but that wouldn't necessarily stop side channels

      2 replies 0 retweets 0 likes
    7. Karl‏ @supersat 9 Oct 2018
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      Replying to @supersat @marcan42 @taviso

      I'm guessing it's from some government requirement more than anything

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 9 Oct 2018
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      Replying to @supersat @taviso

      More likely just snake oil and marketing bullshit.

      11:51 AM - 9 Oct 2018
      • 1 Like
      • Karl
      1 reply 0 retweets 1 like
        1. Karl‏ @supersat 9 Oct 2018
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          Replying to @marcan42 @taviso

          agreed, although if I were making one of these devices, I'd probably use two microcontrollers with a one-way opto-isolator to ensure no digital data could flow in the opposite direction

          0 replies 0 retweets 0 likes
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