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<H1>[zapps-wg] Powers of Tau Attestation</H1>
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<B>Sean Bowe</B>
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<A HREF="mailto:zapps-wg%40lists.zfnd.org?Subject=Re%3A%20%5Bzapps-wg%5D%20Powers%20of%20Tau%20Attestation&In-Reply-To=%3CCAKazn3%3D5ZgQvdv8CrQt54SPqoykB-N2fmhv1PQm8H-6haSjUyg%40mail.gmail.com%3E"
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TITLE="[zapps-wg] Powers of Tau Attestation">sean at z.cash
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<I>Mon Jan 22 06:56:15 EST 2018</I>
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<PRE>There are potentially few useful entropy sources on an isolated system with
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its peripherals removed that has just booted (for example), so a cat
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walking across the keyboard can be used to strengthen the randomness at
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little cost. It's mostly defense-in-depth.
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Sean
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On Mon, Jan 22, 2018 at 1:59 AM, Bastien Teinturier via zapps-wg <
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<A HREF="/mailman/listinfo/zapps-wg">zapps-wg at lists.z.cash.foundation</A>> wrote:
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><i> It's a good point, and I was wondering why this "manual input" entropy is
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</I>><i> needed.
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</I>><i> I don't understand what it adds to the entropy implicitly grabbed from the
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</I>><i> system by the executable.
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</I>><i> If we assume that an adversary is able to monitor the system and replicate
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</I>><i> the entropy of the random generator used in the code, that adversary is
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</I>><i> probably able to grab the input to the process as well right?
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</I>><i> I'm interested in learning more about why you felt it was necessary to ask
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</I>><i> the user to provide some random input.
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</I>><i>
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</I>><i> Cheers,
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</I>><i> Bastien
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</I>><i>
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</I>><i> On Sat, Jan 20, 2018 at 2:04 PM, Daira Hopwood via zapps-wg <
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</I>><i> <A HREF="/mailman/listinfo/zapps-wg">zapps-wg at lists.z.cash.foundation</A>> wrote:
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</I>><i>
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</I>>><i> On 18/01/18 13:46, Bastien Teinturier via zapps-wg wrote:
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</I>>><i> > Powers of Tau Attestation
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</I>>><i>
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</I>>><i> Notice that PowersOfTau_2.jpg leaks the additional entropy provided
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</I>>><i> to the computation. That's ok, it uses operating system entropy as
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</I>>><i> well; just noting that future participants might want to avoid that.
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</I>>><i>
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</I>>><i> --
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</I>>><i> Daira Hopwood ⚧Ⓐ
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</I>>><i>
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</I>>><i>
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</I>><i>
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</I>><i>
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</I>><i> --
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</I>><i>
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</I>><i> [image: stratumn-logo.jpg]
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</I>><i>
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</I>><i>
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</I>><i> Bastien Teinturier
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</I>><i>
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</I>><i> Senior Software Engineer
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</I>><i>
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</I>><i> Stratumn SAS, 1 bis Cité Paradis, 75010 Paris, France
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</I>><i>
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</I>><i> +33 6 28 57 71 59 <+33%206%2028%2057%2071%2059> • <A HREF="/mailman/listinfo/zapps-wg">bastien at stratumn.com</A> •
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</I>><i> stratumn.com <<A HREF="https://stratumn.com/careers">https://stratumn.com/careers</A>>
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</I>><i>
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</I>><i> We are hiring <<A HREF="https://stratumn.com/careers">https://stratumn.com/careers</A>> • Read about us
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</I>><i> <<A HREF="http://blog.stratumn.com">http://blog.stratumn.com</A>> • Twitter <<A HREF="https://twitter.com/stratumnhq">https://twitter.com/stratumnhq</A>>
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</I>><i>
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</I>
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</PRE>
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