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RichFelker's profile
Rich Felker
Rich Felker
Rich Felker
@RichFelker

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Rich Felker

@RichFelker

Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.

musl-libc.org
Joined March 2014

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    1. Norman‏ @NormanShamas Jul 27

      Example 2: A mutual friend wants to connect two friends who don't know each other. In a case like this, it can be easier to introduce a less secure element, like SMS

      1 reply 0 retweets 0 likes
      Show this thread
    2. Norman‏ @NormanShamas Jul 27

      Example 3: Two people meet online and want to have a secure, less public conversation. Sharing phone numbers can reveal information (such as current or past location) that someone does not want to share

      1 reply 0 retweets 0 likes
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    3. Norman‏ @NormanShamas Jul 27

      I am sure there are more examples. Without refactoring the app to have non-phone numbers as unique IDs, are there any design patterns that people have researched?

      1 reply 0 retweets 0 likes
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    4. Erinn Atwater‏ @errorinn Jul 27
      Replying to @NormanShamas

      only solution i knowhttps://medium.com/@mshelton/using-signal-without-giving-your-phone-number-3a575580f652 …

      2 replies 0 retweets 1 like
    5. Rich Felker‏ @RichFelker Jul 27
      Replying to @errorinn @NormanShamas

      And it's not really a good solution because in almost all cases, either there's a trail linking the number back to you, or someone else can hijack the number and you have no recourse.

      1 reply 1 retweet 1 like
    6. Erinn Atwater‏ @errorinn Jul 27
      Replying to @RichFelker @NormanShamas

      i've been able to get a free number with textnow using tor and a throwaway email address. the hijacking thing is certainly still a problem but it's outside many ppls' threat models

      1 reply 1 retweet 2 likes
    7. Norman‏ @NormanShamas Jul 27
      Replying to @errorinn @RichFelker

      Hijacking is definitely of concern for activists and journalists though. There are examples of that already being done in the US against activists with real phone numbers through social engineering of telcoms

      1 reply 0 retweets 2 likes
    8. Erinn Atwater‏ @errorinn Jul 27
      Replying to @NormanShamas @RichFelker

      i've successfully social engineered my own number away from my telco as a test :(

      2 replies 0 retweets 0 likes
    9. Erinn Atwater‏ @errorinn Jul 27
      Replying to @errorinn @NormanShamas @RichFelker

      i think that it boils down to, there is no good answer to ur question. signal/whatsapp are just bad for this use case.

      1 reply 0 retweets 1 like
    10. Erinn Atwater‏ @errorinn Jul 27
      Replying to @errorinn @NormanShamas @RichFelker

      oh! and signal has PINs now to help prevent number hijacking!

      1 reply 1 retweet 1 like
      Rich Felker‏ @RichFelker Jul 27
      Replying to @errorinn @NormanShamas

      What do you do if you legitimately want to use Signal but the previous owner of your number already did before abandoning the number, and put a PIN on it? This whole model around phone numbers as identifiers is hopelessly broken.

      12:14 PM - 27 Jul 2018
      • 1 Retweet
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      • Norman
      1 reply 1 retweet 1 like
        1. Erinn Atwater‏ @errorinn Jul 27
          Replying to @RichFelker @NormanShamas

          agreed.

          0 replies 0 retweets 0 likes
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