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Re: Introducing CBOR-LD...

From: Adrian Gropper <agropper@healthurl.com>
Date: Fri, 24 Jul 2020 11:30:59 -0400
Message-ID: <CANYRo8gNV+7As7FfHjotKQ3RekwxZriQs=5AbLej8T80GXO5aw@mail.gmail.com>
To: Manu Sporny <msporny@digitalbazaar.com>
Cc: Leonard Rosenthol <lrosenth@adobe.com>, "public-credentials@w3.org" <public-credentials@w3.org>
Let’s say I use a public dictionary to encode $9.99 as an object because it
keeps coming up. Then, we have inflation and people come up with a new code
for $10.99. An agency monitoring the public dictionary would be able to
infer the rate of inflation in my country.

- Adrian

On Fri, Jul 24, 2020 at 11:20 AM Manu Sporny <msporny@digitalbazaar.com>
wrote:

> On 7/24/20 11:11 AM, Adrian Gropper wrote:
> > There’s a rather esoteric attack on dictionary-based compression in
> > general. As the process of refining a public dictionary becomes more
> > efficient, we get a kind of traffic analysis or inverse differential
> > privacy effect. I don’t doubt the value of dictionary-based compression
> > but let’s keep entropy in mind.
>
> Could you elaborate more, Adrian? I'm not following.
>
> Perhaps define what the esoteric attack on dictionary-based compression is?
>
> -- manu
>
> --
> Manu Sporny - https://www.linkedin.com/in/manusporny/
> Founder/CEO - Digital Bazaar, Inc.
> blog: Veres One Decentralized Identifier Blockchain Launches
> https://tinyurl.com/veres-one-launches
>
Received on Friday, 24 July 2020 15:31:23 UTC

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