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

Greg Rose <ggr@seer-grog.net> Sat, 24 February 2018 14:41 UTC

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From: Greg Rose <ggr@seer-grog.net>
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Date: Sat, 24 Feb 2018 06:41:46 -0800
Cc: Greg Rose <ggr@seer-grog.net>, "cfrg@irtf.org" <cfrg@irtf.org>, Paul Hoffman <paul.hoffman@icann.org>, "David McGrew (mcgrew)" <mcgrew@cisco.com>
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To: Jean-Philippe Aumasson <jeanphilippe.aumasson@gmail.com>
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Subject: Re: [Cfrg] [Ext] Re: Analysis of ipcrypt?
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> 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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