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We are pleased to announce #LetheKit, the newest project from @BlockchainComns. It is a #DIY platform & SDK for developing sensitive crypto apps on an offline/airgapped device without WiFi, Bluetooth, or local storage, which could leak information. https://github.com/blockchainCommons/bc-lethekit
Without local storage, when you turn #LetheKit off it forgets any sensitive data stored in RAM. Thus the name Lethe ("lee-thee") from the mythological river of forgetfulness and oblivion. (Thank you to @eordano for suggesting the name!).
Led by software engineer and hardware hacker Ken Sedgwick @ksedgwic, #LetheKit leverages a ASMD51 “SparkFun Thing Plus” board with an AMD ATSAMD51J20 32-bit ARM Cortex-M4 processor, printable 3D CAD and assembly instructions & an example seedtool application.
The example seedtool app leverages other libraries under development at @BlockchainComns to help with #SmartCustody. It allows you to create a master cryptographic seed from dice, save or restore it from offline using #BIP39 words or shards of multiple #SLIP39 words using Shamir.
One of the goals of #LetheKit is that all of its functionality is completely inspectable & auditable. You can enter the same dice used for randomness into IanColeman's popular javascript tools, or our forthcoming CLI tools, and compare the results.
#LetheKit leverages a number of new cryptographic libraries by Blockchain Commons, including bc-shamir & bc-slip39, C implementations of the #SLIP39 shamir secret sharing standard. They currently conform to the @Trezor reference code. https://github.com/satoshilabs/slips/blob/master/slip-0039.md
This is a late alpha of #LetheKit v0, so it should not be used for production tasks until it has had further testing and auditing. We need your help to review the implementation & test it before we send it out for formal security review.
Future plans for v0 of the seedtool include #BIP32 xprv, xpub & digital asset key derivation, output of QR codes to ease input into other devices, and other useful tools for an airgapped device. Other apps might include #zkproof support.
Based on the reactions to #LetheKit hardware, we are considering improvements beyond v0 to include various approaches of hardening the software, making the hardware tamper evident, adding a auto-focusing camera for reading dice or QR codes, new motherboards with HSM support, etc.
We would like to thank our financial contributors, project sponsors, sustaining patrons, and of course our volunteers for helping @BlockchainComns to be able do these kinds of blockchain and security infrastructure projects…
#LetheKit Blockchain Commons Sustaining Patrons: Sean Moss-Pultz @moskovitch of https://bitmark.com & Digital Contract Design. Project Sponsors: @unchainedcap. Individual Financial Sponsors: @aantonop @gwillen Alexandre Linhares @DarioUTXO @__B__T__C__ Anonymous x4
Volunteers who helped with this project, either with advice, code or review include: @ksedgwic @howech @kanzure @dsp6s @WolfMcnally @pavolrusnak @MarkFriedenbach @yancyribbens @htcexodus @Appelcline
#LetheKit is a project by @BlockchainComns, a not-for-profit benefit organization supporting the open web. Our work is funded entirely by donations from people like you. Every donation will be spent on building open tools & technology for blockchain & security infrastructure.
To financially support further development of LetheKit# & our other projects, please consider becoming a ongoing patron of Blockchain Commons by sponsoring us through @GitHub; currently, they are matching the first $5k so please do consider this option. https://github.com/sponsors/BlockchainCommons
You can also support our projects by contributing Bitcoin to Blockchain Commons via our BTCPay Server: https://btcpay.blockchaincommons.com
Please share with us on Twitter your progress on making your own #DIY #LetheKit! Share photos of your experience! We welcome issues (even basic questions) and pull requests at our GitHub repository. https://github.com/blockchainCommons/bc-lethekit
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