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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
      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.

      11:15 AM - 9 Oct 2018
      • 1 Retweet
      • 3 Likes
      • Alexander Riccio Dr. Broccoli Wulf Tavis Ormandy Medtech Tribune 📰
      3 replies 1 retweet 3 likes
        1. Hector Martin‏ @marcan42 9 Oct 2018
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          Replying to @marcan42 @taviso

          Maybe it's to protect the host from a USBKill? World's #1 threat scenario 🤪

          0 replies 0 retweets 5 likes
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        1. 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
        2. 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
        3. Show replies
        1. Alexander Riccio‏ @ariccio 10 Oct 2018
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          Replying to @marcan42 @taviso

          Fun fact: you also want to use this is plumbing, anywhere you connect stainless steel to copper, or copper to steel, or any two metals with different galavnic potentials. It'll cause the pipes to galvanically corrode.

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