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dara=google.com ARC-Authentication-Results: i=1; gmr-mx.google.com; dkim=pass header.i=@mail.wpsoftware.net header.s=default header.b=LcRnot7b; spf=pass (google.com: domain of apoelstra@wpsoftware.net designates 66.183.0.205 as permitted sender) smtp.mailfrom=apoelstra@wpsoftware.net; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=wpsoftware.net Received: from mail.wpsoftware.net ([66.183.0.205]) by gmr-mx.google.com with ESMTP id 5614622812f47-3c9aec970c5si553919b6e.3.2024.05.16.10.24.28 for ; Thu, 16 May 2024 10:24:28 -0700 (PDT) Received-SPF: pass (google.com: domain of apoelstra@wpsoftware.net designates 66.183.0.205 as permitted sender) client-ip=66.183.0.205; Received: from camus (camus-andrew.lan [192.168.0.190]) by mail.wpsoftware.net (Postfix) with ESMTPSA id 3ACAD40102; Thu, 16 May 2024 17:24:27 +0000 (UTC) Date: Thu, 16 May 2024 17:24:26 +0000 From: Andrew Poelstra To: Rama Gan Cc: "bitcoindev@googlegroups.com" Subject: Re: [bitcoindev] Penlock, a paper-computer for secret-splitting BIP39 seed phrases Message-ID: References: <9bt6npqSdpuYOcaDySZDvBOwXVq_v70FBnIseMT6AXNZ4V9HylyubEaGU0S8K5TMckXTcUqQIv-FN-QLIZjj8hJbzfB9ja9S8gxKTaQ2FfM=@proton.me> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="xLDPCawwEMTarxP7" Content-Disposition: inline In-Reply-To: X-Original-Sender: apoelstra@wpsoftware.net X-Original-Authentication-Results: gmr-mx.google.com; dkim=pass header.i=@mail.wpsoftware.net header.s=default header.b=LcRnot7b; spf=pass (google.com: domain of apoelstra@wpsoftware.net designates 66.183.0.205 as permitted sender) smtp.mailfrom=apoelstra@wpsoftware.net; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=wpsoftware.net Precedence: list Mailing-list: list bitcoindev@googlegroups.com; contact bitcoindev+owners@googlegroups.com List-ID: X-Google-Group-Id: 786775582512 List-Post: , List-Help: , List-Archive: , List-Unsubscribe: , X-Spam-Score: -0.8 (/) --xLDPCawwEMTarxP7 Content-Type: text/plain; charset="UTF-8" Content-Disposition: inline On Thu, May 16, 2024 at 01:27:55PM +0000, Andrew Poelstra wrote: > > > > [3]: The 2-of-M wheel "Recovery" window shows the distance between two shares: > > https://beta.penlock.io/2ofm-wheel.html > > > > Ah, I understand. Looking again at your wheel, I see that it's a > combination slide wheel (for addition/subtraction) and slide chart (for > "recovery windows"). > > What I'm saying is that you don't need to have extra cutout windows for > the recovery windows. You should be able to just label the characters on > the inner wheel with them, similar to how you have already labeled = > with (1). > Ah, I am incorrect. You can put the recovery windows on a slide wheel but it needs to use a different ordering than the one used for addition. So you would need a second wheel and possibly some relabelling of recovery windows. I don't see why this is ... it seems that the recovery windows, being differences of characters, should follow exactly the same pattern as addition (possibly in the opposite direction). So worth investigating. But assuming that it isn't possible and would require you introduce another wheel, it's probably not worth the extra "simplicity". After all, you only need to look up the windows once per share (so volvelle ergonomics are not so important) and you only need to cut out as many windows as you have shares (so setup/construction time is not bad). -- Andrew Poelstra Director, Blockstream Research Email: apoelstra at wpsoftware.net Web: https://www.wpsoftware.net/andrew The sun is always shining in space -Justin Lewis-Webster -- You received this message because you are subscribed to the Google Groups "Bitcoin Development Mailing List" group. To unsubscribe from this group and stop receiving emails from it, send an email to bitcoindev+unsubscribe@googlegroups.com. 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