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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. Tavis Ormandy‏Verified account @taviso 24 May 2018
      • Report Tweet
      • Report NetzDG Violation
      Replying to @alexstamos

      Everyone is on board w/preventing abuse. It's the bit about having to share intimate pictures that's worrying. You're dismissive whenever someone says there are technical solutions, if you've got some convincing evidence, why not share? (eg. why not sgx+photodna+review on match?)

      1 reply 1 retweet 12 likes
    2. Matthijs Mullender‏ @mullender 24 May 2018
      • Report Tweet
      • Report NetzDG Violation
      Replying to @taviso @alexstamos

      You mean? 1. submit hash/photo ID to block 2. When a hit happens, trigger manual review of the uploaded photo 3. If bad stuff, tell law enforcement about uploader. And inform victim 4. If good stuff, ask original submitter for proof the hash is for a bad photo

      2 replies 0 retweets 0 likes
    3. Katriel‏ @katrielalex 24 May 2018
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      Replying to @mullender @taviso @alexstamos

      Downside 1: this lets anyone force manual review of any photo by fake-reporting it. So e.g. the Turkish gov could make anyone wait $REVIEWTIME to post photos it didn't like

      2 replies 0 retweets 1 like
    4. Tavis Ormandy‏Verified account @taviso 24 May 2018
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      Replying to @katrielalex @mullender @alexstamos

      That only works once, the hash can be whitelisted after first review. That's a pretty small gain for a lot of lying and misdirection.

      1 reply 0 retweets 1 like
    5. Matthijs Mullender‏ @mullender 24 May 2018
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      Replying to @taviso @katrielalex @alexstamos

      If a gov wants to do this they need to be the first to have the photo. Any hashes of photos already uploaded would be whitelisted by default. When you report a hash we already have seen, we review the matching photo.

      1 reply 0 retweets 1 like
    6. Katriel‏ @katrielalex 25 May 2018
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      Replying to @mullender @taviso @alexstamos

      Err sorry, I've misunderstood something. We are discussing a hypothetical other way to do this, correct? If so, if you whitelist any photos uploaded by default then you have the original problem again: someone can post revenge porn and get it whitelisted by default.

      1 reply 0 retweets 0 likes
    7. Katriel‏ @katrielalex 25 May 2018
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      Replying to @katrielalex @mullender and

      IIUC the constraints are: 1. If you disclose a bad photo to Facebook, after some review delay no-one else should be able to upload it. It's not ok to have it uploadable and taken down later after a time delay. (Without this, people could post revenge porn.)

      1 reply 0 retweets 0 likes
    8. Katriel‏ @katrielalex 25 May 2018
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      Replying to @katrielalex @mullender and

      2. If you disclose a non-bad photo to Facebook, after some review delay no-one else should be prevented from uploading it. It's not ok to have it blocked and post-able after a time delay. (Without this, governments could find photos they don't like and add a review time lag.)

      1 reply 0 retweets 0 likes
    9. Katriel‏ @katrielalex 25 May 2018
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      Replying to @katrielalex @mullender and

      Or is it the case that 2 already doesn't hold for Facebook right now, but that isn't a problem?

      1 reply 0 retweets 0 likes
    10. Tavis Ormandy‏Verified account @taviso 25 May 2018
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      Replying to @katrielalex @mullender @alexstamos

      You are concerned that governments will have access to a sensitive photo, then block people from uploading that photo for a few hours by lying and claiming they are abuse victims. This very unlikely scenario (as pointed out, how will they have it first?) Is pretty minor attack.

      1 reply 0 retweets 0 likes
      Tavis Ormandy‏Verified account @taviso 25 May 2018
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      Replying to @taviso @katrielalex and

      I think that isn't going to happen, it's a tiny temp delay for a lot of lies and abusing a program for helping victims. Even if it you disagree, the alternative is mail humans your nudes for review, and allow them to be posted while the human verifies your claims.

      6:23 AM - 25 May 2018
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Matthijs Mullender‏ @mullender 25 May 2018
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          Replying to @taviso @katrielalex @alexstamos

          For the revenge porn situation the photo has either been uploaded already or not. If not and a victim registers a hash through a channel, then any future uploaded photos matching the hash will get delayed and reviewed.

          1 reply 0 retweets 2 likes
        3. Matthijs Mullender‏ @mullender 25 May 2018
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          Replying to @mullender @taviso and

          If the photo was already uploaded, the hash would locate it, and it can be reviewed and deleted right then. In neither case the victim has to upload their photos. (in this different hypothetical solution)

          2 replies 0 retweets 1 like
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