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Re: [Cfrg] XMSS and https://ia.cr/2017/938

Philip Lafrance <philip.lafrance92@gmail.com> Fri, 27 April 2018 15:29 UTC

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From: Philip Lafrance <philip.lafrance92@gmail.com>
Date: Fri, 27 Apr 2018 15:29:07 +0000
Message-ID: <CALwqbuwaTxd9JQBMSOWNj0rK_CU3-=mYq+f1k0t1aNXQ8H7FrA@mail.gmail.com>
To: Dan Brown <danibrown@blackberry.com>
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Subject: Re: [Cfrg] XMSS and https://ia.cr/2017/938
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Hello Dan,

(I'm not a member of the XMSS team, but felt qualified to answer.)

The answer to your question is not at all. Our paper only discussed the
security of WOTS-PRF and this has no bearing on the security of other
Winternitz constructions. In particular I should say that the WOTS+ scheme
remains secure.

Good question though! And thanks for asking :)

Warm regards,
Philip Lafrance

On Fri, Apr 27, 2018, 11:24 AM Dan Brown, <danibrown@blackberry.com> wrote:

> Hi XMSS team,
>
>
>
> Lafrance and Menezes https://ia.cr/2017/938 describe a flaw in a security
> analysis and correction to the security estimates for WOTS-PRF and to
> XMSS.  I am rather new to this area, so I naively ask:
>
>
>
> Are the Lafrance—Menezes results applicable to (and addressed by) the
> current draft of XMSS?
>
>
>
> Best regards,
>
> ​​​​​
>
> Dan Brown
> Standards Manager
> Office: +1 (289) 261-4157
> Mobile: +1 (416) 276-1736
> danibrown@blackberry.com
>
>
> [image: BlackBerry] <http://www.blackberry.com/>
>
>
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