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Presentation.html
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<!DOCTYPE html><html lang="fr-FR"><head><meta name="author" content="Xen0rInspire"><meta property="article:author" content="Xen0rInspire"><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=""] .bespoke-marp-parent>.bespoke-marp-osc>button,body[data-bespoke-view=next] .bespoke-marp-parent>.bespoke-marp-osc>button,body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-info-container button{-webkit-tap-highlight-color:transparent;-webkit-appearance:none;-moz-appearance:none;appearance:none;background-color:transparent;border:0;color:inherit;cursor:pointer;font-size:inherit;opacity:.8;outline:none;padding:0;transition:opacity .2s 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/*!
* Marp default theme.
*
* @theme default
* @author Yuki Hattori
*
* @auto-scaling true
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nowrap;font-size:29px;height:720px;justify-content:center;padding:78.5px;width:1280px}div#p>svg>foreignObject>section{--marpit-root-font-size:29px}div#p>svg>foreignObject>section>:last-child,div#p>svg>foreignObject>section[data-footer]>:nth-last-child(2){margin-bottom:0}div#p>svg>foreignObject>section>:first-child,div#p>svg>foreignObject>section>header:first-child+*{margin-top:0}div#p>svg>foreignObject>section:after{bottom:21px;color:#777;font-size:24px;padding:0;position:absolute;right:30px}div#p>svg>foreignObject>section:after{--marpit-root-font-size:24px}div#p>svg>foreignObject>section.invert{background-color:#222;color:#e6eaf0}div#p>svg>foreignObject>section.invert:after{color:#999}div#p>svg>foreignObject>section.invert img{background-color:transparent}div#p>svg>foreignObject>section.invert a{color:#50b3ff}div#p>svg>foreignObject>section.invert h1{color:#a3c5e7}div#p>svg>foreignObject>section.invert h2,div#p>svg>foreignObject>section.invert h3,div#p>svg>foreignObject>section.invert h4,div#p>svg>foreignObject>section.invert h5{color:#ebeff5}div#p>svg>foreignObject>section.invert blockquote,div#p>svg>foreignObject>section.invert h6{border-color:#3d3f43;color:#939699}div#p>svg>foreignObject>section.invert h1 strong,div#p>svg>foreignObject>section.invert h2 strong,div#p>svg>foreignObject>section.invert h3 strong,div#p>svg>foreignObject>section.invert h4 strong,div#p>svg>foreignObject>section.invert h5 strong,div#p>svg>foreignObject>section.invert h6 strong{color:#7bf}div#p>svg>foreignObject>section.invert hr{background-color:#3d3f43}div#p>svg>foreignObject>section.invert footer,div#p>svg>foreignObject>section.invert header{color:hsla(0,0%,60%,.75)}div#p>svg>foreignObject>section.invert code,div#p>svg>foreignObject>section.invert kbd{background-color:#111}div#p>svg>foreignObject>section.invert kbd{border-color:#666;box-shadow:inset 0 -1px 0 #555;color:#e6eaf0}div#p>svg>foreignObject>section.invert table tr{background-color:#12181d;border-color:#60657b}div#p>svg>foreignObject>section.invert table tr:nth-child(2n){background-color:#1b2024}div#p>svg>foreignObject>section.invert table td,div#p>svg>foreignObject>section.invert table th{border-color:#5b5e61}div#p>svg>foreignObject>section.invert pre{background-color:#0a0e12;border-color:#777}div#p>svg>foreignObject>section.invert pre code{background-color:transparent}div#p>svg>foreignObject>section[data-color] h1,div#p>svg>foreignObject>section[data-color] h2,div#p>svg>foreignObject>section[data-color] h3,div#p>svg>foreignObject>section[data-color] h4,div#p>svg>foreignObject>section[data-color] h5,div#p>svg>foreignObject>section[data-color] h6{color:currentColor}div#p>svg>foreignObject>section{font-family:'Century Gothic',serif!important;font-size:26pt}div#p>svg>foreignObject>section{--marpit-root-font-size:26pt}div#p>svg>foreignObject>section[data-marpit-advanced-background=background]{columns:initial!important;display:block!important;padding:0!important}div#p>svg>foreignObject>section[data-marpit-advanced-background=background]:after,div#p>svg>foreignObject>section[data-marpit-advanced-background=background]:before,div#p>svg>foreignObject>section[data-marpit-advanced-background=content]:after,div#p>svg>foreignObject>section[data-marpit-advanced-background=content]:before{display:none!important}div#p>svg>foreignObject>section[data-marpit-advanced-background=background]>div[data-marpit-advanced-background-container]{all:initial;display:flex;flex-direction:row;height:100%;overflow:hidden;width:100%}div#p>svg>foreignObject>section[data-marpit-advanced-background=background]>div[data-marpit-advanced-background-container][data-marpit-advanced-background-direction=vertical]{flex-direction:column}div#p>svg>foreignObject>section[data-marpit-advanced-background=background][data-marpit-advanced-background-split]>div[data-marpit-advanced-background-container]{width:var(--marpit-advanced-background-split,50%)}div#p>svg>foreignObject>section[data-marpit-advanced-background=background][data-marpit-advanced-background-split=right]>div[data-marpit-advanced-background-container]{margin-left:calc(100% - var(--marpit-advanced-background-split, 50%))}div#p>svg>foreignObject>section[data-marpit-advanced-background=background]>div[data-marpit-advanced-background-container]>figure{all:initial;background-position:center;background-repeat:no-repeat;background-size:cover;flex:auto;margin:0}div#p>svg>foreignObject>section[data-marpit-advanced-background=content],div#p>svg>foreignObject>section[data-marpit-advanced-background=pseudo]{background:transparent!important}div#p>svg>foreignObject>section[data-marpit-advanced-background=pseudo],div#p>svg[data-marpit-svg]>foreignObject[data-marpit-advanced-background=pseudo]{pointer-events:none!important}div#p>svg>foreignObject>section[data-marpit-advanced-background-split]{width:100%;height:100%}</style></head><body><div class="bespoke-marp-osc"><button data-bespoke-marp-osc="prev" tabindex="-1" title="Previous slide">Previous slide</button><span data-bespoke-marp-osc="page"></span><button data-bespoke-marp-osc="next" 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-paginate="true" data-color="#ffff" data-background-color="#2A2A2A" data-header="" data-footer="**10/11/2021 - Nicolas F**" data-class="invert" class="invert" data-marpit-pagination="1" data-marpit-pagination-total="18" style="--paginate:true;--color:#ffff;--background-color:#2A2A2A;--header:;--footer:**10/11/2021 - Nicolas F**;--class:invert;color:#ffff;background-color:#2A2A2A;background-image:none;">
<header><img src="./img/logo.png" alt="" style="width:100px;height:100px;" /></header>
<h1><svg data-marp-fitting="svg"><foreignObject><span data-marp-fitting-svg-content>Random Number Generation on Linux Systems </span></foreignObject></svg></h1>
<p>How does it work ?</p>
<footer><strong>10/11/2021 - Nicolas F</strong></footer>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="2" data-paginate="true" data-color="#ffff" data-background-color="#2A2A2A" data-header="" data-footer="**10/11/2021 - Nicolas F**" data-class="invert" class="invert" data-marpit-pagination="2" data-marpit-pagination-total="18" style="--paginate:true;--color:#ffff;--background-color:#2A2A2A;--header:;--footer:**10/11/2021 - Nicolas F**;--class:invert;color:#ffff;background-color:#2A2A2A;background-image:none;">
<header><img src="./img/logo.png" alt="" style="width:100px;height:100px;" /></header>
<h1>Technical Terminology</h1>
<ul>
<li>Entropy</li>
<li>Special files on Linux distributions</li>
<li>Pseudorandom number generation (PRNG)</li>
<li>Seed (in a random number generator context)</li>
</ul>
<footer><strong>10/11/2021 - Nicolas F</strong></footer>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="3" data-paginate="true" data-color="#ffff" data-background-color="#2A2A2A" data-header="" data-footer="**10/11/2021 - Nicolas F**" data-class="invert" class="invert" data-marpit-pagination="3" data-marpit-pagination-total="18" style="--paginate:true;--color:#ffff;--background-color:#2A2A2A;--header:;--footer:**10/11/2021 - Nicolas F**;--class:invert;color:#ffff;background-color:#2A2A2A;background-image:none;">
<header><img src="./img/logo.png" alt="" style="width:100px;height:100px;" /></header>
<h1>What is the entropy ?</h1>
<footer><strong>10/11/2021 - Nicolas F</strong></footer>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="4" data-paginate="true" data-color="#ffff" data-background-color="#2A2A2A" data-header="" data-footer="**10/11/2021 - Nicolas F**" data-class="invert" class="invert" data-marpit-pagination="4" data-marpit-pagination-total="18" style="--paginate:true;--color:#ffff;--background-color:#2A2A2A;--header:;--footer:**10/11/2021 - Nicolas F**;--class:invert;color:#ffff;background-color:#2A2A2A;background-image:none;">
<header><img src="./img/logo.png" alt="" style="width:100px;height:100px;" /></header>
<p><em>The entropy means a measurable physical property that is particularly associated with a state of <strong>disorder</strong>, <strong>randomness</strong>, <strong>uncertainty</strong> or even <strong>chaos</strong>.</em></p>
<footer><strong>10/11/2021 - Nicolas F</strong></footer>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="5" data-paginate="true" data-color="#ffff" data-background-color="#2A2A2A" data-header="" data-footer="**10/11/2021 - Nicolas F**" data-class="invert" class="invert" data-marpit-pagination="5" data-marpit-pagination-total="18" style="--paginate:true;--color:#ffff;--background-color:#2A2A2A;--header:;--footer:**10/11/2021 - Nicolas F**;--class:invert;color:#ffff;background-color:#2A2A2A;background-image:none;">
<header><img src="./img/logo.png" alt="" style="width:100px;height:100px;" /></header>
<h1>Example in computer science</h1>
<br />
<p>String 1 : <code>aiK!l0bUMud5?2</code></p>
<p>String 2 : <code>aaaAbkkKmmB99b</code></p>
<footer><strong>10/11/2021 - Nicolas F</strong></footer>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="6" data-paginate="true" data-color="#ffff" data-background-color="#2A2A2A" data-header="" data-footer="**10/11/2021 - Nicolas F**" data-class="invert" class="invert" data-marpit-pagination="6" data-marpit-pagination-total="18" style="--paginate:true;--color:#ffff;--background-color:#2A2A2A;--header:;--footer:**10/11/2021 - Nicolas F**;--class:invert;color:#ffff;background-color:#2A2A2A;background-image:none;">
<header><img src="./img/logo.png" alt="" style="width:100px;height:100px;" /></header>
<h1>Example in computer science</h1>
<br />
<p>String 1 : <code>aiK!l0bUMud5?2</code> ← Better entropy</p>
<p>String 2 : <code>aaaAbkkKmmB99b</code></p>
<footer><strong>10/11/2021 - Nicolas F</strong></footer>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="7" data-paginate="true" data-color="#ffff" data-background-color="#2A2A2A" data-header="" data-footer="**10/11/2021 - Nicolas F**" data-class="invert" class="invert" data-marpit-pagination="7" data-marpit-pagination-total="18" style="--paginate:true;--color:#ffff;--background-color:#2A2A2A;--header:;--footer:**10/11/2021 - Nicolas F**;--class:invert;color:#ffff;background-color:#2A2A2A;background-image:none;">
<header><img src="./img/logo.png" alt="" style="width:100px;height:100px;" /></header>
<h1>What are the special files on Linux distributions ?</h1>
<footer><strong>10/11/2021 - Nicolas F</strong></footer>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="8" data-paginate="true" data-color="#ffff" data-background-color="#2A2A2A" data-header="" data-footer="**10/11/2021 - Nicolas F**" data-class="invert" class="invert" data-marpit-pagination="8" data-marpit-pagination-total="18" style="--paginate:true;--color:#ffff;--background-color:#2A2A2A;--header:;--footer:**10/11/2021 - Nicolas F**;--class:invert;color:#ffff;background-color:#2A2A2A;background-image:none;">
<header><img src="./img/logo.png" alt="" style="width:100px;height:100px;" /></header>
<p><em>A <strong>device file</strong> or <strong>special file</strong> is an interface to a <strong>device driver</strong> that appears in a file system as if it were an ordinary file.</em></p>
<footer><strong>10/11/2021 - Nicolas F</strong></footer>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="9" data-paginate="true" data-color="#ffff" data-background-color="#2A2A2A" data-header="" data-footer="**10/11/2021 - Nicolas F**" data-class="invert" class="invert" data-marpit-pagination="9" data-marpit-pagination-total="18" style="--paginate:true;--color:#ffff;--background-color:#2A2A2A;--header:;--footer:**10/11/2021 - Nicolas F**;--class:invert;color:#ffff;background-color:#2A2A2A;background-image:none;">
<header><img src="./img/logo.png" alt="" style="width:100px;height:100px;" /></header>
<br />
<h2>Block devices</h2>
<pre><code class="language-bash"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>/dev/sda
/dev/nvme
/dev/vda
/dev/cdrom
</span></span></foreignObject></svg></code></pre>
<h2>Characters devices</h2>
<pre><code class="language-bash"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>/dev/random
/dev/urandom
/dev/zero
/dev/ttyX <span class="hljs-comment"># where X is a number</span>
</span></span></foreignObject></svg></code></pre>
<footer><strong>10/11/2021 - Nicolas F</strong></footer>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="10" data-paginate="true" data-color="#ffff" data-background-color="#2A2A2A" data-header="" data-footer="**10/11/2021 - Nicolas F**" data-class="invert" class="invert" data-marpit-pagination="10" data-marpit-pagination-total="18" style="--paginate:true;--color:#ffff;--background-color:#2A2A2A;--header:;--footer:**10/11/2021 - Nicolas F**;--class:invert;color:#ffff;background-color:#2A2A2A;background-image:none;">
<header><img src="./img/logo.png" alt="" style="width:100px;height:100px;" /></header>
<h1>Why we talk about "<em>pseudo-random</em>" generation ?</h1>
<footer><strong>10/11/2021 - Nicolas F</strong></footer>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="11" data-paginate="true" data-color="#ffff" data-background-color="#2A2A2A" data-header="" data-footer="**10/11/2021 - Nicolas F**" data-class="invert" class="invert" data-marpit-pagination="11" data-marpit-pagination-total="18" style="--paginate:true;--color:#ffff;--background-color:#2A2A2A;--header:;--footer:**10/11/2021 - Nicolas F**;--class:invert;color:#ffff;background-color:#2A2A2A;background-image:none;">
<header><img src="./img/logo.png" alt="" style="width:100px;height:100px;" /></header>
<p><em>Pseudo-random number generation creates a sequence of numbers that approximates the properties of perfect random numbers as closely as possible. It's based on <strong>mathematical algorithms</strong>.</em></p>
<footer><strong>10/11/2021 - Nicolas F</strong></footer>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="12" data-paginate="true" data-color="#ffff" data-background-color="#2A2A2A" data-header="" data-footer="**10/11/2021 - Nicolas F**" data-class="invert" class="invert" data-marpit-pagination="12" data-marpit-pagination-total="18" style="--paginate:true;--color:#ffff;--background-color:#2A2A2A;--header:;--footer:**10/11/2021 - Nicolas F**;--class:invert;color:#ffff;background-color:#2A2A2A;background-image:none;">
<header><img src="./img/logo.png" alt="" style="width:100px;height:100px;" /></header>
<h1>What is a seed in pseudo-random number generation ?</h1>
<footer><strong>10/11/2021 - Nicolas F</strong></footer>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="13" data-paginate="true" data-color="#ffff" data-background-color="#2A2A2A" data-header="" data-footer="**10/11/2021 - Nicolas F**" data-class="invert" class="invert" data-marpit-pagination="13" data-marpit-pagination-total="18" style="--paginate:true;--color:#ffff;--background-color:#2A2A2A;--header:;--footer:**10/11/2021 - Nicolas F**;--class:invert;color:#ffff;background-color:#2A2A2A;background-image:none;">
<header><img src="./img/logo.png" alt="" style="width:100px;height:100px;" /></header>
<p><em>The seed is the <strong>entry point</strong> of the pseudo-random generation algorithm. This value is defined explicitly by the user or directly with a default value like the system timestamp for example. The purpose of the seed is to allow the user to <strong>lock</strong> the pseudo-random number generator, to <strong>prevent replicable analysis</strong>.</em></p>
<footer><strong>10/11/2021 - Nicolas F</strong></footer>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="14" data-paginate="true" data-color="#ffff" data-background-color="#2A2A2A" data-header="" data-footer="**10/11/2021 - Nicolas F**" data-class="invert" class="invert" data-marpit-pagination="14" data-marpit-pagination-total="18" style="--paginate:true;--color:#ffff;--background-color:#2A2A2A;--header:;--footer:**10/11/2021 - Nicolas F**;--class:invert;color:#ffff;background-color:#2A2A2A;background-image:none;">
<header><img src="./img/logo.png" alt="" style="width:100px;height:100px;" /></header>
<h1>/dev/random vs /dev/urandom</h1>
<p>The most common special files to generate random numbers</p>
<footer><strong>10/11/2021 - Nicolas F</strong></footer>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="15" data-paginate="true" data-color="#ffff" data-background-color="#2A2A2A" data-header="" data-footer="**10/11/2021 - Nicolas F**" data-class="invert" class="invert" data-marpit-pagination="15" data-marpit-pagination-total="18" style="--paginate:true;--color:#ffff;--background-color:#2A2A2A;--header:;--footer:**10/11/2021 - Nicolas F**;--class:invert;color:#ffff;background-color:#2A2A2A;background-image:none;">
<header><img src="./img/logo.png" alt="" style="width:100px;height:100px;" /></header>
<h1>/dev/random</h1>
<ul>
<li>High entropy quality<br />
→ Blocks the reading process if the entropy isn't enough</li>
<li>Can rely on hardware peripherals</li>
</ul>
<br />
<p>Used to generate SSH keys, for LUKS encryption...</p>
<footer><strong>10/11/2021 - Nicolas F</strong></footer>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="16" data-paginate="true" data-color="#ffff" data-background-color="#2A2A2A" data-header="" data-footer="**10/11/2021 - Nicolas F**" data-class="invert" class="invert" data-marpit-pagination="16" data-marpit-pagination-total="18" style="--paginate:true;--color:#ffff;--background-color:#2A2A2A;--header:;--footer:**10/11/2021 - Nicolas F**;--class:invert;color:#ffff;background-color:#2A2A2A;background-image:none;">
<header><img src="./img/logo.png" alt="" style="width:100px;height:100px;" /></header>
<h1>/dev/urandom</h1>
<ul>
<li>Lower entropy quality<br />
→ Doesn't block the reading process no matter how much entropy</li>
<li>Better to use for long processes</li>
</ul>
<br />
<p>Used to wipe disks (shred command for example)</p>
<footer><strong>10/11/2021 - Nicolas F</strong></footer>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="17" data-paginate="true" data-color="#ffff" data-background-color="#2A2A2A" data-header="" data-footer="**10/11/2021 - Nicolas F**" data-class="invert" class="invert" data-marpit-pagination="17" data-marpit-pagination-total="18" style="--paginate:true;--color:#ffff;--background-color:#2A2A2A;--header:;--footer:**10/11/2021 - Nicolas F**;--class:invert;color:#ffff;background-color:#2A2A2A;background-image:none;">
<header><img src="./img/logo.png" alt="" style="width:100px;height:100px;" /></header>
<h1>Other random data source devices</h1>
<p>Not implemented on every Linux distributions</p>
<ul>
<li>
<p><strong>/dev/arandom</strong> : Generates high-quality pseudo-random output data (based on RC4)</p>
</li>
<li>
<p><strong>/dev/prandom</strong> : Simple pseudo-random generator</p>
</li>
<li>
<p><strong>/dev/srandom</strong> : This device returns reliable random data even if sufficient entropy is not currently available (based on MD5)</p>
</li>
</ul>
<footer><strong>10/11/2021 - Nicolas F</strong></footer>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section data-paginate="true" data-color="#ffff" data-background-color="#2A2A2A" data-header="" data-footer="**10/11/2021 - Nicolas F**" data-class="invert" class="invert" data-marpit-pagination="18" data-marpit-pagination-total="18" style="--paginate:true;--color:#ffff;--background-color:#2A2A2A;--header:;--footer:**10/11/2021 - Nicolas F**;--class:invert;color:#ffff;background-color:#2A2A2A;background-image:none;--marpit-advanced-background-split:50%;" data-marpit-advanced-background="background" data-marpit-advanced-background-split="right"><div data-marpit-advanced-background-container="true" data-marpit-advanced-background-direction="horizontal"><figure style="background-image:url("./img/bye.gif");background-size:contain;"></figure></div></section></foreignObject><foreignObject width="50%" height="720"><section id="18" data-paginate="true" data-color="#ffff" data-background-color="#2A2A2A" data-header="" data-footer="**10/11/2021 - Nicolas F**" data-class="invert" class="invert" data-marpit-pagination="18" data-marpit-pagination-total="18" style="--paginate:true;--color:#ffff;--background-color:#2A2A2A;--header:;--footer:**10/11/2021 - Nicolas F**;--class:invert;color:#ffff;background-color:#2A2A2A;background-image:none;--marpit-advanced-background-split:50%;" data-marpit-advanced-background="content" data-marpit-advanced-background-split="right">
<header><img src="./img/logo.png" alt="" style="width:100px;height:100px;" /></header>
<h1>Any questions ?</h1>
<footer><strong>10/11/2021 - Nicolas F</strong></footer>
</section>
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