Comment on The Guardian and the University of Cambridge Computer Science Department unveil new technology to protect journalists

• Ulrich@feddit.org ⁨3⁩ ⁨weeks⁩ ago

  No they can’t.

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  • Natanael@infosec.pub ⁨3⁩ ⁨weeks⁩ ago

    It’s called traffic analysis

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    • Ulrich@feddit.org ⁨3⁩ ⁨weeks⁩ ago

      It’s called encryption

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      • ICastFist@programming.dev ⁨3⁩ ⁨weeks⁩ ago

        Packet data has headers that can identify where it’s coming from and where it’s going to. The contents of the packet can be securely encrypted, but destination is not. So long as you know which IPs Signal’s servers use (which is public information), it’s trivial to know when a device is sending/receiving messages with Signal.

        This is also why something like Tor manages to circumvent packet sniffing, it’s impossible to know the actual destination because that’s part of the encrypted payload that a different node will decrypt and forward.

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      • papertowels@mander.xyz ⁨3⁩ ⁨weeks⁩ ago

        How exactly do you think encryption prevents the analysis of seeing when an encrypted message is sent?

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      • Natanael@infosec.pub ⁨3⁩ ⁨weeks⁩ ago

        I run a cryptography forum

        Encryption doesn’t hide data sizes unless you take extra steps

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      • Roughknite@lemm.ee ⁨3⁩ ⁨weeks⁩ ago

        How dumb are you? Like someone said the point is they can see the fact that you sent a secured message period. Not with the guardian app though. Pretty easy to comprehend so I am confused why you are acting so stupid.

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  • papertowels@mander.xyz ⁨3⁩ ⁨weeks⁩ ago

    Here’s a relevant stack exchange question. Regarding what an ISP can learn. Of note, everybody is ceding that the ISP can tell you’re using signal, and they’ve moved on to whether or not they’d be able to fingerprint your usage patterns.

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