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Re: [Cfrg] [Ext] Re: Analysis of ipcrypt?

Jean-Philippe Aumasson <jeanphilippe.aumasson@gmail.com> Sat, 24 February 2018 14:51 UTC

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References: <18C83761-E442-45D9-BDBF-71DC7F751007@icann.org> <CAHmME9r3awwZxjEU-HWnOCyARhBx54VOcUOFJB4opmneKdZsyA@mail.gmail.com> <72BE956C-7D0F-41BE-88DE-C7C2063A7FED@seer-grog.net> <877er4h8n5.fsf@fifthhorseman.net> <149857F4-859F-45C8-AA6E-E1F72342B988@seer-grog.net> <A17CCC93-1AEE-47E3-B1A3-CA2791AA3AE0@icann.org> <6063D40B-F8A8-4C63-92EB-53EF4DB64975@cisco.com> <CAGiyFdddeUkqhMxQLH079syiHuV3KgY3_Ko2pVxYhjd+jEUMLA@mail.gmail.com> <E04CDD47-DCB3-456E-A8A6-EE93B63442B0@seer-grog.net>
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From: Jean-Philippe Aumasson <jeanphilippe.aumasson@gmail.com>
Date: Sat, 24 Feb 2018 14:51:00 +0000
Message-ID: <CAGiyFdcsf=LJ22jfcDy41x=VBrXHkUbE+WadRnYTyY-sOTs4GA@mail.gmail.com>
To: Greg Rose <ggr@seer-grog.net>
Cc: "cfrg@irtf.org" <cfrg@irtf.org>, Paul Hoffman <paul.hoffman@icann.org>, "David McGrew (mcgrew)" <mcgrew@cisco.com>
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Subject: Re: [Cfrg] [Ext] Re: Analysis of ipcrypt?
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In my use case it had to be 1-to-1.
On Sat, 24 Feb 2018 at 15:41, Greg Rose <ggr@seer-grog.net> wrote:

>
> > On Feb 23, 2018, at 23:34 , Jean-Philippe Aumasson <
> jeanphilippe.aumasson@gmail.com> wrote:
> >
> > Seconding David. We're talking tokenization more than encryption. In the
> context where I created ipcrypt we just needed to obfuscate the PII data
> (such as IP addresses) in a deterministic and format-preserving way.
>
> Now I'm confused. Is there a requirement for invertability or not? The
> problem, if it isn't invertible, is that it will act as a hash, and you can
> expect collisions after only about 60k entries. Are there consequences to
> that?
>
> Greg.

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