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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. This Tweet is unavailable.
    2. Hector Martin‏ @marcan42 4 Jan 2019
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      Replying to @Serianox_ @pawel_lasek and

      Which TPM is this? All the ones I know of are EEPROM based and require no power.

      0 replies 0 retweets 0 likes
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    4. Hector Martin‏ @marcan42 4 Jan 2019
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      Replying to @Serianox_ @pawel_lasek and

      There is no mention of battery backup anywhere in the datasheet for SLB9635TT1.2 (typical Infineon TPM). The only mention of batteries in the TPM 1.2 specification is about timestamping/clock, and it's optional.

      0 replies 0 retweets 0 likes
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    6. Hector Martin‏ @marcan42 4 Jan 2019
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      Replying to @Serianox_ @pawel_lasek and

      You need a battery to do *anything* when powered off. Without a battery chassis intrusion detection is useless as a defense against hardware modification attacks like the one I described.

      1 reply 0 retweets 0 likes
    7.  🏳️‍🌈JOHN WOLF CONNOR 🏳️‍🌈‏ @connorfgws 6 Jan 2019
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      Replying to @marcan42 @Serianox_ and

      So what a cmos battery to save the bios settings or do u mean now battery to reset the settings?

      1 reply 0 retweets 0 likes
    8. Hector Martin‏ @marcan42 6 Jan 2019
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      Replying to @connorfgws @Serianox_ and

      Look, this isn't rocket science. A computer without a battery cannot possibly detect that you've opened the case while powered off (and do something about it like destroy encryption keys).

      1 reply 0 retweets 0 likes
    9. Paweł Lasek‏ @pawel_lasek 6 Jan 2019
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      Replying to @marcan42 @Serianox_ and

      Unless there's a big enough capacitor in a chip to destroy internal encryption key, or drain a static nvram hosting it, etc. All possible to circumvent, but you don't need battery - you need some source of current (or in certain conditions, a drain)

      1 reply 0 retweets 0 likes
    10. Paweł Lasek‏ @pawel_lasek 6 Jan 2019
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      Replying to @pawel_lasek @marcan42 and

      Now, whether the chips involved actually do any of that is another question completely

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 6 Jan 2019
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      Replying to @pawel_lasek @Serianox_ and

      A capacitor would not work in practice because it would mean you lose your keys if you keep the computer powered off for too long (when it runs out of charge). Even a battery is dodgy in that sense.

      1:15 PM - 6 Jan 2019
      • 1 Like
      • 🏳️‍🌈JOHN WOLF CONNOR🏳️‍🌈
      1 reply 0 retweets 1 like
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        1. Paweł Lasek‏ @pawel_lasek 6 Jan 2019
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          Replying to @marcan42 @Serianox_ and

          Interestingly enough it's an approach used by FlexVer (in TALOS2), where very, very low power sustains FPGA which deconfigures once it runs out

          0 replies 0 retweets 0 likes
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