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Matthew Green
Matthew Green
Matthew Green
@matthew_d_green

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Matthew Green

@matthew_d_green

I teach cryptography at Johns Hopkins.

Baltimore, MD
blog.cryptographyengineering.com
Joined January 2010

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Matthew Green‏ @matthew_d_green

Do something nice for your family this holiday season: go through their phone settings and turn on all the privacy features.

7:44 AM - 24 Dec 2019
  • 1,446 Retweets
  • 4,667 Likes
  • Mike Rohith Prakash iRoller Sulaiman Chris Jarvis Mohan R S Cheston LeAnn Ramirez
69 replies 1,446 retweets 4,667 likes
    1. New conversation
    2. Matthew Green‏ @matthew_d_green Dec 24

      It’s sort of amazing to me how hard this has gotten, even on iOS, which advertises itself as the “privacy” OS. My wife asked me how Facebook knew she walked by a particular store yesterday, so I dove into the Settings. What a mess.

      29 replies 229 retweets 813 likes
      Show this thread
    3. Matthew Green‏ @matthew_d_green Dec 24

      First, there’s this “Privacy” tab in iOS settings, but under it you’ve got this ridiculous and ever-growing list of crap. Every app appears multiple times, and you have to know where to look.pic.twitter.com/KQL7GtPnuE

      7 replies 32 retweets 228 likes
      Show this thread
    4. Matthew Green‏ @matthew_d_green Dec 24

      Browsing the “Location Services” tab alone is a nightmare. There’s no way to sort by “Always”, which is usually the particularly bad permission you care about. (Although “While Using” is a bit ambiguous too.)pic.twitter.com/FaSKmrpYAe

      7 replies 29 retweets 213 likes
      Show this thread
    5. Matthew Green‏ @matthew_d_green Dec 24

      And don’t get me started on this “Bluetooth” tab. Why do any of these apps need direct access to my Bluetooth other than crappy tracking?pic.twitter.com/1fIohZG0vx

      14 replies 37 retweets 263 likes
      Show this thread
    6. Matthew Green‏ @matthew_d_green Dec 24

      And even if you turn off location services for an app, the app may still get this data by examining the metadata from your photos. (I’m not sure if iOS13 fixes this.)pic.twitter.com/wrXSuNmU81

      13 replies 39 retweets 240 likes
      Show this thread
    7. Matthew Green‏ @matthew_d_green Dec 24

      TL;DR If Apple’s going to advertise itself as the “private” phone, they need to do a much better job than this. “At least we’re aren’t Google!” is pretty much the best they can say.

      36 replies 245 retweets 1,234 likes
      Show this thread
    8. End of conversation
    1. New conversation
    2. Cryptobill‏ @cryptodotbi Dec 24
      Replying to @matthew_d_green

      I've done it before. Every OS update resets everything back to tracking mode.

      2 replies 4 retweets 39 likes
    3. 𝕐Ω𝕌ℕ𝔾 𝔾𝕃Ω𝕎‏ @TheYoungGlow Dec 25
      Replying to

      It really doesn’t. I’ve had my settings stay stable through multiple phone switches and major OS updates.

      0 replies 0 retweets 23 likes
    4. End of conversation
    1. New conversation
    2. Lloyd Wood‏ @WoodLloydWood Dec 24
      Replying to @matthew_d_green

      and do something nice for everyone else: turn off the keyboard clicks...

      1 reply 1 retweet 53 likes
    3. Kevin P. Fleming‏ @realkpfleming Dec 25
      Replying to

      And Facebook pops and dings. All sounds really, except for incoming calls.

      0 replies 0 retweets 22 likes
    4. End of conversation
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