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taviso's profile
Tavis Ormandy
Tavis Ormandy
Tavis Ormandy
Verified account
@taviso

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Tavis OrmandyVerified account

@taviso

Vulnerability researcher at Google. This is a personal stream, opinions expressed are mine.

California
taviso.decsystem.org
Joined April 2008

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    1. Matthew Green‏ @matthew_d_green 11 Dec 2019
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      The best part of the “going dark” debate is that we have to pretend sophisticated attacks by nation-states and criminals are some kind of Gibsonian sci-fi fantasy. It’s 2019. Theres a multi-billion dollar industry around attacking phone security systems.https://www.fastcompany.com/90307864/u-s-fund-sells-israeli-hacking-firm-nso-group-amid-spy-mystery …

      11 replies 173 retweets 367 likes
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    2. Tavis Ormandy‏Verified account @taviso 11 Dec 2019
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      Replying to @matthew_d_green @rmhrisk

      As a thought experiment, if you had to choose between a key escrow system accessible to due process (with all the risks you've spelled out) xor eliminating criminal/state access to 0day exploits, which would you choose? (I'm not making a point, just curious about your position).

      6 replies 2 retweets 23 likes
    3. chort  ↙️ ↙️ ↙️ Abolish ICE‏ @chort0 14 Dec 2019
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      Replying to @taviso @matthew_d_green @rmhrisk

      I would ban state-sponsored key escrow and accept 0-day. Criminals do far less systematic damage than authoritarian states do. It’s also possible to defend against 0-day. Nothing can be done to prevent abuse of key escrow, and no way to see it being used.

      1 reply 0 retweets 1 like
    4. Tavis Ormandy‏Verified account @taviso 14 Dec 2019
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      Replying to @chort0 @matthew_d_green @rmhrisk

      Interesting, but not sure I understand the "no way to see it" point, presumably it would require a legal paper trail and audited access (the same way the signing keys are stored in an HSM today, for example).

      3 replies 0 retweets 1 like
    5. Ryan Hurst‏Verified account @rmhrisk 14 Dec 2019
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      Replying to @taviso @chort0 @matthew_d_green

      Also the type of authentication that is done by a a CA is far easier to implement (prove you control the thing you want access to) vs prove you are a representative of a organization that is part of a government that is authorized to get unfettered across to someone’s else’s info

      1 reply 0 retweets 0 likes
    6. Ryan Hurst‏Verified account @rmhrisk 14 Dec 2019
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      Replying to @rmhrisk @taviso and

      Despite this a large majority of the miss issuance by CAs is a result of human error; it’s a significant percentage of issuance too. Importantly far less is at risk in that system also.

      1 reply 0 retweets 0 likes
      Tavis Ormandy‏Verified account @taviso 14 Dec 2019
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      Replying to @rmhrisk @chort0 @matthew_d_green

      Very true, but we have also had package signing infrastructure compromised (e.g. Microsoft, Red Hat, Debian, Adobe) and that's what we rely on today. So I don't see this as a significant increase in risk, I take it you disagree?

      10:50 AM - 14 Dec 2019
      1 reply 0 retweets 0 likes
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        2. Ryan Hurst‏Verified account @rmhrisk 14 Dec 2019
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          Replying to @taviso @chort0 @matthew_d_green

          I do disagree; it’s much easier for Microsoft to authenticate the entitlement of their employee than it is for them to authenticate the entitlement of a person in a entity that has government affiliation that is authorized by that government to decrypt your device; ...

          1 reply 0 retweets 2 likes
        3. Ryan Hurst‏Verified account @rmhrisk 14 Dec 2019
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          Replying to @rmhrisk @taviso and

          both involve human processes that need not to fail but one is plausible risk can be reduced substantially; the other is effectively unbounded.

          1 reply 0 retweets 0 likes
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