+Delivery-date: Sun, 12 May 2024 11:08:09 -0700

+Received: from mail-qv1-f59.google.com ([209.85.219.59])

+ by mail.fairlystable.org with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256

+ (Exim 4.94.2)

+ (envelope-from <bitcoindev+bncBAABBAELQSZAMGQE3BKIA7A@googlegroups.com>)

+ id 1s6DcG-0002a5-KG

+ for bitcoindev@gnusha.org; Sun, 12 May 2024 11:08:08 -0700

+Received: by mail-qv1-f59.google.com with SMTP id 6a1803df08f44-6a0c1aff9f5sf45725096d6.2

+ for <bitcoindev@gnusha.org>; Sun, 12 May 2024 11:08:08 -0700 (PDT)

+ARC-Seal: i=2; a=rsa-sha256; t=1715537282; cv=pass;

+ d=google.com; s=arc-20160816;

+ b=TeIluambsO2a793ay/QNn22aJ0RMwk8+gm+GO4dDj1EBJzsFb3nmqeA7EkzZU9BK7h

+ bSUUMjNAU2i4aAmN+QJWIa0JXu2H6M5TnKxYYQge7f3pabZhbQ07ke7ppoaC3R8qL1t5

+ G9eaWrikmxEvP9uvfJkrUmIi5WOVkzpICGOyrQzucu+9s1dT/GUdp4x0cYA7RzdJUywp

+ cGqz9UDGAyw55G3UdJMUUnxMY9+kJRclQ9hnahd8KtgdOvcuVYs+NwCprwMF+JzZkRQB

+ /v4WUZsQtsfUnI8xPoi9FDLbx1m1hu8SS/G+I40U2LTRsrV2e63yOtGvihsE2ns/6csa

+ WXnA==

+ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816;

+ h=list-unsubscribe:list-subscribe:list-archive:list-help:list-post

+ :list-id:mailing-list:precedence:reply-to:mime-version:feedback-id

+ :message-id:subject:from:to:date:dkim-signature;

+ bh=THXYp0MWKaYfCshtU2d9DrKc5OiPShoGyMutwzK7sXg=;

+ fh=h+xvhpU4gMuK+GuRlaw4Bh9uxXhqvF0YAQ3Qm1cQJmE=;

+ b=yMRA5Hr7i8fsGDD+YuFaySjwMidOj52pfOObBbPMQkwiZao6SFc9EpqFljGDReFwfa

+ x0awyJMIppPb1XCe5NIc6o0YNDkw9D5fvoyuqHuITGp++c/ZO/+qGEPaTqkweu8Pjuqh

+ bramP2p6YuLqzwAf3WAmFV726ghFaX/Vq6B9STY9xVwsiN7Sr3keF0V6UK3TcpBTb6tj

+ QIdLhfcQVC8kwGDj6HVrpc1ZsfiSNS/vYNmAj77bEpV2puN+C4nJl5TtDIzbQYL2nsdD

+ BQMTmnwuQoyAvq0xCsl3or7qwUUKS6NzWUmVIWvns5m+b6weSI7DuoKfcNWQJgO6JLIY

+ j8iw==;

+ darn=gnusha.org

+ARC-Authentication-Results: i=2; gmr-mx.google.com;

+ dkim=pass header.i=@proton.me header.s=protonmail header.b=Xy+bBGip;

+ spf=pass (google.com: domain of ganrama@proton.me designates 185.70.40.141 as permitted sender) smtp.mailfrom=ganrama@proton.me;

+ dmarc=pass (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=proton.me

+DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;

+ d=googlegroups.com; s=20230601; t=1715537282; x=1716142082; darn=gnusha.org;

+ h=list-unsubscribe:list-subscribe:list-archive:list-help:list-post

+ :list-id:mailing-list:precedence:reply-to

+ :x-original-authentication-results:x-original-sender:mime-version

+ :feedback-id:message-id:subject:from:to:date:from:to:cc:subject:date

+ :message-id:reply-to;

+ bh=THXYp0MWKaYfCshtU2d9DrKc5OiPShoGyMutwzK7sXg=;

+ b=R1FBHUDIYVKZNDhNm668A3oYoes9llBDi8fTv4z7ukQA1tkNSJtzF4H5w93870yM3L

+ ETM8sh+PDI6TWW0OJL5CCURApEqJtMQqTglRm16WkmlzGPjVA4hA9FgQLfgJD8eN9D4L

+ ePsOJBPeGQO4pF34AqqzdhA0c0FPLv3qGu1L5COzpoHalqsrqjTSayfolHeWFPQGTTbN

+ ejNF4I6UehtZDkwzCjNU1qTwTm1+Ox2SdJ3IkKB+dDaKUcHKI7XF1T6j5CXBiyuKBloh

+ kldYKyG1L/lh8Po1tjndgPXOb2CgBfzKx7xpSXISKCrMRxKnTuc1L+h+VDl/iYQ6yY3p

+ 7ynw==

+X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;

+ d=1e100.net; s=20230601; t=1715537282; x=1716142082;

+ h=list-unsubscribe:list-subscribe:list-archive:list-help:list-post

+ :list-id:mailing-list:precedence:reply-to

+ :x-original-authentication-results:x-original-sender:mime-version

+ :feedback-id:message-id:subject:from:to:date:x-beenthere

+ :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to;

+ bh=THXYp0MWKaYfCshtU2d9DrKc5OiPShoGyMutwzK7sXg=;

+ b=n39tQ8fLpFdUZzdnahPzLxYdUIuk9OE41XlvAUEMknnoAeF7bKILuWS2ROs3YlCvRI

+ jwOqNMOS3/XTDX7iFycBeI6HnzDQ9+j08oAnu+9j9jSCMxkrdn6dUGkPRp5DT/wu2llp

+ vovSR9lihKmXyw9udo5FtsvcbB7ZFSgvahfySvRO1jmoy+UGNQonSMfkhq7Xt/cuaEQ8

+ M5JjzWdGXqIA7IvE8IeYS+Zogj9uRgaQhk9lOBu6MgFd/KYuo5duCC+tQfRsMdoRJOqV

+ Hgwhql5GAGCutAlQLHnwZiv+8iU1eSim4yldV5f4DVTf0S8GvTpv9zbaEMyKukNjDk4T

+ RLzw==

+X-Forwarded-Encrypted: i=2; AJvYcCXOtL3/okeORxhwvzWpRhRBEc/vFZlo4cSSNTnqGCvyBNqsKuBW/oJuzHoIgm256E3fzZr9x4P5DithhQohX1vycW/al/w=

+X-Gm-Message-State: AOJu0YxJTIvDGlXyCqdJrzPVxXoKjDUcaTVluZVAi6o1ZSybW76q86yM

+ Moyo9oHokg7bsTDq3BkNyFQVrHnkFGmeLByIflvDnFftsMjzdIoZ

+X-Google-Smtp-Source: AGHT+IGq5RNgMQIGvLGle6G2DoKY0NHH6MCx3U6ur5zDcCQMt5jWXoBOOJVH/GqggzzBdE34vjKtMw==

+X-Received: by 2002:a05:6214:4602:b0:696:a202:5f53 with SMTP id 6a1803df08f44-6a168258891mr99358636d6.49.1715537281940;

+ Sun, 12 May 2024 11:08:01 -0700 (PDT)

+X-BeenThere: bitcoindev@googlegroups.com

+Received: by 2002:a05:6214:1250:b0:6a0:a591:6f3d with SMTP id

+ 6a1803df08f44-6a15d32feeals41778656d6.0.-pod-prod-07-us; Sun, 12 May 2024

+ 11:08:00 -0700 (PDT)

+X-Received: by 2002:a05:6214:5281:b0:6a0:ea32:ae66 with SMTP id 6a1803df08f44-6a16821084amr5912346d6.11.1715537280611;

+ Sun, 12 May 2024 11:08:00 -0700 (PDT)

+Received: by 2002:a05:620a:190f:b0:790:ee24:5a3f with SMTP id af79cd13be357-792bcb6ec4dms85a;

+ Sun, 12 May 2024 11:04:17 -0700 (PDT)

+X-Received: by 2002:a2e:98d9:0:b0:2e5:65a3:e67 with SMTP id 38308e7fff4ca-2e565a30f6fmr30649571fa.40.1715537056000;

+ Sun, 12 May 2024 11:04:16 -0700 (PDT)

+ARC-Seal: i=1; a=rsa-sha256; t=1715537055; cv=none;

+ d=google.com; s=arc-20160816;

+ b=JEVTudSsMKUq+5tiBaI6s04lqpyeJpaFIqBhOXIrRrJnBxmYZ6gMvzjbSe5EqZKuB9

+ tWHq+sDSCa4vfO2cluSjUz9uOBwI47hh1WfIo8Y+z0P0qCixNnlKOFcX85p2HjL57Xld

+ e7vWdnUe0/80BRVmoA3O/Xb6o85VUl2ksIdG9J5J0Kje02dLOUp3VwCcVbH4FUYzV5bP

+ Ya5X2EI5Edv7DlAVKjVjdXhLbB2uiY+Ndnc4Z6eEtIHiuo6FhNkdPiiNsT+5T86jIf1d

+ nWO+hgKnmIADHn7mD1ZN0uTolYDAm/rVvtT3W7WMj5IF7phUdYLL5WXi26xKRY2+M8IR

+ naog==

+ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816;

+ h=content-transfer-encoding:mime-version:feedback-id:message-id

+ :subject:from:to:date:dkim-signature;

+ bh=IfN9NlVlhD38c823pl2H0zfPZSsIuEk2+6kN5jr5HS0=;

+ fh=lhFSo2W/mHC0QoJ9oNg3A35n0DTltt3CQl1/0RggJlk=;

+ b=ZTZe+VaRip2IyFjgw7ka7G/Dh6Z4Ju9zV1Ao/qYZC++hdXBLUxsO30P2Gbf4pBB/tI

+ UNVO1BvpNTTfjIvrIAhjajJo/gNk8V3uYcosMjuQbopdL1NNLWg5xTL5uH0SLw701E0f

+ tHBAjeTjZuBiO9NJTke1PWzA3GmUMxfgKTFIgHILlO6krh7Q6Qx/WP7/FAxJ5Tkxgf+b

+ JZA2NYdTwDL8NxTapiFNZdXEh0H33mCGBrz/mbsj5ChCvtZ4LO3S+0BGkLCCiDeY8iBr

+ tXEm8trY2U28+r7fYJJlDtyUM9CeRzbtZmVoBM/gF9BmA1sHYO75uLlT7SWxp9jzgOWu

+ QZLw==;

+ dara=google.com

+ARC-Authentication-Results: i=1; gmr-mx.google.com;

+ dkim=pass header.i=@proton.me header.s=protonmail header.b=Xy+bBGip;

+ spf=pass (google.com: domain of ganrama@proton.me designates 185.70.40.141 as permitted sender) smtp.mailfrom=ganrama@proton.me;

+ dmarc=pass (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=proton.me

+Received: from mail-40141.protonmail.ch (mail-40141.protonmail.ch. [185.70.40.141])

+ by gmr-mx.google.com with ESMTPS id 5b1f17b1804b1-420174a84d7si40145e9.1.2024.05.12.11.04.15

+ for <bitcoindev@googlegroups.com>

+ (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256);

+ Sun, 12 May 2024 11:04:15 -0700 (PDT)

+Received-SPF: pass (google.com: domain of ganrama@proton.me designates 185.70.40.141 as permitted sender) client-ip=185.70.40.141;

+Date: Sun, 12 May 2024 18:04:09 +0000

+To: "bitcoindev@googlegroups.com" <bitcoindev@googlegroups.com>

+From: "'Rama Gan' via Bitcoin Development Mailing List" <bitcoindev@googlegroups.com>

+Subject: [bitcoindev] Penlock, a paper-computer for secret-splitting BIP39

+ seed phrases

+Message-ID: <9bt6npqSdpuYOcaDySZDvBOwXVq_v70FBnIseMT6AXNZ4V9HylyubEaGU0S8K5TMckXTcUqQIv-FN-QLIZjj8hJbzfB9ja9S8gxKTaQ2FfM=@proton.me>

+Feedback-ID: 79991369:user:proton

+X-Pm-Message-ID: 8800b2edf451c89cc111b2bb67c954e1de94946b

+MIME-Version: 1.0

+Content-Type: text/plain; charset="UTF-8"

+X-Original-Sender: ganrama@proton.me

+X-Original-Authentication-Results: gmr-mx.google.com; dkim=pass

+ header.i=@proton.me header.s=protonmail header.b=Xy+bBGip; spf=pass

+ (google.com: domain of ganrama@proton.me designates 185.70.40.141 as

+ permitted sender) smtp.mailfrom=ganrama@proton.me; dmarc=pass

+ (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=proton.me

+X-Original-From: Rama Gan <ganrama@proton.me>

+Reply-To: Rama Gan <ganrama@proton.me>

+Precedence: list

+Mailing-list: list bitcoindev@googlegroups.com; contact bitcoindev+owners@googlegroups.com

+List-ID: <bitcoindev.googlegroups.com>

+X-Google-Group-Id: 786775582512

+List-Post: <https://groups.google.com/group/bitcoindev/post>, <mailto:bitcoindev@googlegroups.com>

+List-Help: <https://groups.google.com/support/>, <mailto:bitcoindev+help@googlegroups.com>

+List-Archive: <https://groups.google.com/group/bitcoindev

+List-Subscribe: <https://groups.google.com/group/bitcoindev/subscribe>, <mailto:bitcoindev+subscribe@googlegroups.com>

+List-Unsubscribe: <mailto:googlegroups-manage+786775582512+unsubscribe@googlegroups.com>,

+ <https://groups.google.com/group/bitcoindev/subscribe>

+X-Spam-Score: -1.0 (-)

+

+I am excited to introduce Penlock, a printable paper-computer that guides users

+through secret-splitting their BIP39 seed phrase without an electronic device. A

+beta release is now available for peer-reviewing and early testing:

+https://beta.penlock.io.

+

+There are a growing number of people storing a significant portion of their

+savings on the blockchain. Most people use a BIP39 seed phrase to back up their

+wallet, but this method has disadvantages. If the seed phrase is lost or stolen,

+then the funds are at risk of being irremediably lost. Additionally, planning

+for inheritance would require entrusting the phrase to a third party, something

+that is not advisable.

+

+Secret splitting is a straightforward cryptographic concept that solves these

+issues. A 2-of-3 split produces 3 "shares"; Any 2 of these shares can be used to

+recover the seed phrase. Each share can be stored in a separate location and no

+single share can be used to reveal information about the seed phrase.

+Trust-minized inheritance is then possible, as one share can be given directly

+to an heir, and another left in the will.

+

+Unfortunately, despite commendable efforts with SLIP39, we still lack a

+wallet-agnostic secret splitting standard. Moreover, users who already produced

+their BIP39 seed phrase might be legitimately reluctant to enter it into an

+electronic device for the purpose of secret splitting.

+

+This is were Penlock enters the scene! Secret-splitting BIP39 seed phrases

+guarantees compatibility with all existing wallets. Using the analog

+implementation, one can run the algorithm without exposing the seed phrase to an

+additional electronic device. You only need a printer, a craft knife, some

+scissors, a pencil and paper, and a few hours of free time.

+

+Penlock was inspired by Codex32, a similar project from A. Poelstra and R.

+O'Connor. From there, I tried to map the design space by exploring different

+trade-offs, producing prototypes, benchmarking their execution speed, their ease

+of use, etc. While there is always room for improvement, I believe that the

+design of Penlock is now close enough to optimal and deserves to be released.

+

+Penlock is an open-source project that will always remain free to use.

+Cryptographers, developers and enthusiasts are very welcome to test and

+peer-review Penlock until its public release date, which is currently planned

+for Q3 2024. Please share any feedback or comments you may have! :)

+

+

+Rama Gan

+

+--

+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.

+To view this discussion on the web visit https://groups.google.com/d/msgid/bitcoindev/9bt6npqSdpuYOcaDySZDvBOwXVq_v70FBnIseMT6AXNZ4V9HylyubEaGU0S8K5TMckXTcUqQIv-FN-QLIZjj8hJbzfB9ja9S8gxKTaQ2FfM%3D%40proton.me.

+