There are only 4 billion to reverse, not that hard really with a rainbow
table...

On Thu, 21 May 2020 at 13:08, Michał Górny <mgo...@gentoo.org> wrote:

> On Thu, 2020-05-21 at 13:57 +0200, Ulrich Mueller wrote:
> > > > > > > On Thu, 21 May 2020, Robert Bridge wrote:
> > > On Thu, 21 May 2020 at 09:47, Michał Górny <mgo...@gentoo.org> wrote:
> > > > Option 1: IP-based limiting
> > > > ===========================
> > > >
> > > Preface this with IANAL, check with your own legal counsel...
> > > While IP address based methods might be attractive  technically, do
> > > remember that an IP address is considered Personally Identifiable in
> > > European Data Protection law.
> > > The fact submissions require an action by the user will probably be
> > > sufficient to be explicit consent, any system storing these details
> should
> > > allow for the use to revoke their consent: If you collect anything
> > > personally identifiable, you will need to provide a mechanism for
> users to
> > > request the removal of all their submissions.
> > > Tread carefully with this project. :)
> >
> > You don't have to store any IP addresses, you can store a cryptographic
> > hash like their b2sum (salted if necessary).
> >
>
> Yes, this is as great as storing hashes of phone numbers ;-).
>
> --
> Best regards,
> Michał Górny
>
>

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