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Define "unlinkability" #103

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nadimkobeissi opened this issue Apr 9, 2020 · 9 comments
Open

Define "unlinkability" #103

nadimkobeissi opened this issue Apr 9, 2020 · 9 comments
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clarification taken-into-account-but-not-solved-yet

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@nadimkobeissi
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@nadimkobeissi nadimkobeissi commented Apr 9, 2020

Increasingly, "unlinkability" is becoming a central security property with regards to DP-3T, even leading to a new protocol variant being published yesterday with specific focus on unlinkability.

However, it has come up in discussions more than once that the text does not provide an actual definition of unlinkability at any point. I'm not necessarily asking for a fully formal definition in the standard model, but even a semi-formal one would certainly help especially when related to classes of principals and attackers discussed in the paper.

What exactly is unlinkability, which information does it pertain to, and what does it seek to achieve, against whom and in which circumstances?

@lbarman lbarman added the clarification label Apr 9, 2020
@cascremers
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@cascremers cascremers commented Apr 10, 2020

Thanks, this is something we are working on, and will add to the documentation as soon as we have it.

@s-chtl s-chtl added the will-close-soon-without-further-input label Apr 20, 2020
@lbarman lbarman closed this as completed Apr 21, 2020
@nealmcb
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@nealmcb nealmcb commented Apr 21, 2020

@cascremers, thanks for your response.

Note, I find it helpful to be able to track whether the issue is resolved by leaving it open until fixed. Would it make sense to re-open it? Or is it done, could you link to the change in the documentation?

Note that although I'm subscribed to this issue, I didn't get a notification about the will-close-soon-without-further-input label, or I would have commented then.
Thanks again.

@akuckartz
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@akuckartz akuckartz commented Apr 21, 2020

Please reopen this issue. It is not yet resolved.

@burdges
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@burdges burdges commented Apr 21, 2020

Could some reference the new variant?

@lbarman
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@lbarman lbarman commented Apr 22, 2020

@nealmcb @akuckartz sure, I'll try with a new label so I can filter by the issues I still have to process. Thanks for your understanding :)

@lbarman lbarman reopened this Apr 22, 2020
@lbarman lbarman added taken-into-account-but-not-solved-yet and removed will-close-soon-without-further-input labels Apr 22, 2020
@nadimkobeissi
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@nadimkobeissi nadimkobeissi commented Apr 27, 2020

Could someone please point me to where unlinkability is now defined within the text? I don't understand how this has been taken into account; I don't see a new definition anywhere.

@lbarman
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@lbarman lbarman commented Apr 28, 2020

@KAepora the issue was raised internally but I don't think it is solved yet (as the label mentions). Naturally if someone does a PR (or a simply suggestion in this thread) we'd be happy to consider including it. Thanks!

@nadimkobeissi
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@nadimkobeissi nadimkobeissi commented Apr 29, 2020

@lbarman But then why was this issue closed and then reopened with the will-close-without-further-input label?

@lbarman
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@lbarman lbarman commented Apr 29, 2020

It wasn't. Although I must admit I have also been confused by Github's interface :)
I reopened, then removed will-close-soon and added taken-into-account... (see top of the column on the right).

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