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wallets.html
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<!DOCTYPE html><html lang="C"><head><title>Wallet Overview</title><meta property="og:title" content="Wallet Overview"><meta name="author" content="Will Drewry"><meta property="article:author" content="Will Drewry"><meta name="description" content="A walkthrough of briolette wallets"><meta property="og:description" content="A walkthrough of briolette wallets"><meta name="keywords" content="briolette,ecash,cbdc,se,smartcard"><link rel="canonical" href="https://github.com/google/briolette/docs/designs/explainers/wallets.md"><meta property="og:url" content="https://github.com/google/briolette/docs/designs/explainers/wallets.md"><meta charset="UTF-8"><meta name="viewport" content="width=device-width,height=device-height,initial-scale=1.0"><meta name="apple-mobile-web-app-capable" content="yes"><meta http-equiv="X-UA-Compatible" content="ie=edge"><meta property="og:type" content="website"><meta name="twitter:card" content="summary"><style>@media screen{body[data-bespoke-view=""] 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img[data-marp-twemoji]{background:transparent;height:1em;margin:0 .05em 0 .1em;vertical-align:-.1em;width:1em}
/*!
* Marp default theme.
*
* @theme default
* @author Yuki Hattori
*
* @auto-scaling true
* @size 16:9 1280px 720px
* @size 4:3 960px 720px
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tabindex="-1" title="Next slide">Next slide</button><button data-bespoke-marp-osc="fullscreen" tabindex="-1" title="Toggle fullscreen (f)">Toggle fullscreen</button><button data-bespoke-marp-osc="presenter" tabindex="-1" title="Open presenter view (p)">Open presenter view</button></div><div id=":$p"><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="1" data-transition="{"name":"pull","builtinFallback":true}">
<h1 id="briolette-wallets">Briolette Wallets</h1>
<p>A quick overview</p>
</section>
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<h2 id="what-is-a-wallet">What is a wallet?</h2>
<ul>
<li>A wallet is a combination of hardware and software that a user may rely on to send and receive tokens within a briolette system</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="3" data-transition-back="{"name":"pull","builtinFallback":true}" data-transition="{"name":"pull","builtinFallback":true}">
<h2 id="what-hardware-makes-up-a-wallet">What hardware makes up a wallet?</h2>
<p>Wallet hardware must</p>
<ul>
<li>provide accelerated, isolated cryptographic operations and secure storage</li>
<li>For the current cryptographic protocols and algorithms
<ul>
<li>Elliptic Curve Direct Anonymous Attestation, with specific curve support</li>
</ul>
</li>
<li>Key generation</li>
<li>Operation access control
<ul>
<li>Primarily to disallow double-signing of token transfers within a validity window</li>
</ul>
</li>
<li>Secure storage of private key matter</li>
<li>While dedicated hardware is not necessarily required
<ul>
<li>it provides a strong set of assurances to the system operator</li>
<li>and avoids solutions which provide non-technical assurances</li>
</ul>
</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="4" data-transition-back="{"name":"pull","builtinFallback":true}" data-transition="{"name":"pull","builtinFallback":true}">
<h2 id="what-software-makes-up-a-wallet">What software makes up a wallet?</h2>
<p>Wallet software must</p>
<ul>
<li>implement all transaction and service protocols
<ul>
<li>manage token storage and wallet state</li>
<li>fetch system state and tickets</li>
<li>renew or swap tokens near expiration or transfer limits</li>
</ul>
</li>
<li>implement form factor specific interaction protocols (NFC, BLE, TLS, etc)</li>
<li>provide a user interface for token and wallet management
<ul>
<li>transactional authorization will be critical to the user experience</li>
</ul>
</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="5" data-transition-back="{"name":"pull","builtinFallback":true}" data-transition="{"name":"pull","builtinFallback":true}">
<h2 id="how-is-a-wallet-enabled-12">How is a wallet enabled? (1/2)</h2>
<ul>
<li>Wallets must be provided by a vendor which the operator trusts</li>
<li>Each wallet will go through a number of steps at setup
<ul>
<li>The wallet will prove it is a valid vendor wallet to the vendor</li>
<li>The wallet will generate a private key and send the public key to the vendor</li>
<li>If the wallet validates, the vendor will issue a network access credential (NAC) for the wallet's key</li>
<li>The vendor (and/or the user) will supply other configuration for the supported briolette systems</li>
</ul>
</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="6" data-transition-back="{"name":"pull","builtinFallback":true}" data-transition="{"name":"pull","builtinFallback":true}">
<h2 id="how-is-a-wallet-enabled-22">How is a wallet enabled? (2/2)</h2>
<ul>
<li>For every briolette system the wallet will operate with,
<ul>
<li>the wallet will use its NAC to request a token transfer credential (TTC) from the operator</li>
<li>once issued, it will then use its NAC and TTC to request transaction tickets</li>
</ul>
</li>
<li>With a TTC and tickets, the wallet is ready for transacting</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="7" data-transition-back="{"name":"pull","builtinFallback":true}" data-transition="{"name":"pull","builtinFallback":true}">
<h2 id="how-does-a-wallet-prove-it-is-valid-to-its-vendor">How does a wallet prove it is valid to its vendor?</h2>
<ul>
<li>This process is curently up to the vendor, but standardization is encouraged.</li>
<li>There are many possible approaches:
<ul>
<li>The vendor may embed a secret key in the wallet's hardware which is used to "attest" to its validity</li>
<li>The vendor may rely on a secret key installed after an in-person, or other, process which is then used to attest</li>
<li>...</li>
</ul>
</li>
<li>Similarly, preparation for the arrival of post-quantum cryptography needs may set additional requirements
<ul>
<li>such as the addition of a shared symmetric secret or other PQ-resistant fallback</li>
</ul>
</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="8" data-transition-back="{"name":"pull","builtinFallback":true}" data-transition="{"name":"pull","builtinFallback":true}">
<h2 id="how-does-a-wallet-vendor-become-eligible-for-any-given-operator">How does a wallet vendor become eligible for any given operator?</h2>
<ul>
<li>At present, there is no guidance.
<ul>
<li>It is expected that protocol and API standardization will guide baseline conformance</li>
<li>Secondarily, laboratory-validated standards, like Common Criteria Protection Profiles, may provide assurance of hardware and software properties</li>
</ul>
</li>
<li>Once a vendor has met the criteria, they will register multiple NAC group public keys
<ul>
<li>Credentials issued to the wallets will be validated against these prior to allowing access by the operator</li>
</ul>
</li>
</ul>
</section>
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