linux-kernel - Re: [RFC PATCH v2 00/12] crypto: Adiantum support

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Date:   Mon, 22 Oct 2018 13:20:51 +0200
From:   Tomer Ashur <tomer.ashur@...t.kuleuven.be>
To:     Paul Crowley <paulcrowley@...gle.com>, Jason@...c4.com
Cc:     ebiggers@...nel.org, linux-crypto@...r.kernel.org,
        linux-fscrypt@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Greg Kaiser <gkaiser@...gle.com>,
        Michael Halcrow <mhalcrow@...gle.com>,
        samuel.c.p.neves@...il.com
Subject: Re: [RFC PATCH v2 00/12] crypto: Adiantum support

> On 19-Oct-18 8:19 PM, Paul Crowley wrote:
>> I would prefer not to wait. Unlike a new primitive whose strength can
>> only be known through attempts at cryptanalysis, Adiantum is a
>> construction based on
>> well-understood and trusted primitives; it is secure if the proof
>> accompanying it is correct. Given that (outside competitions or
>> standardization efforts) no-one ever issues public statements that
>> they think algorithms or proofs are good, what I'm expecting from
>> academia is silence :) The most we could hope for would be getting the
>> paper accepted at a conference, and we're pursuing that but there's a
>> good chance that won't happen simply because it's not very novel. It
>> basically takes existing ideas and applies them using a stream cipher
>> instead of a block cipher, and a faster hashing mode; it's also a
>> small update from HPolyC. I've had some private feedback that the
>> proof seems correct, and that's all I'm expecting to get.
>
I tend to agree with Paul on this point. This is a place where academia
needs to improve. An attempt to do so is the Real World Crypto
conference (RWC; https://rwc.iacr.org/2019/), but the deadline for
submissions was October 1st. For HpolyC I asked a few people to take a
look at the construction and the consensus was that it seems secure but
that the proof style makes it hard to verify. I haven't had the time yet
to read the Adiantum paper (and I'm not a provable security person
anyway) but I suppose Paul took the comments he received on this into
account and that's the best we can hope for. Academia simply moves in a
different pace and has different incentives.

 Tomer



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