davidbgk
/
larlet-fr-david

<!doctype html><!-- This is a valid HTML5 document. -->
<!-- Screen readers, SEO, extensions and so on. -->
<html lang=fr>
<!-- Has to be within the first 1024 bytes, hence before the <title>
  See: https://www.w3.org/TR/2012/CR-html5-20121217/document-metadata.html#charset -->
<meta charset=utf-8>
<!-- Why no `X-UA-Compatible` meta: https://stackoverflow.com/a/6771584 -->
<!-- The viewport meta is quite crowded and we are responsible for that.
  See: https://codepen.io/tigt/post/meta-viewport-for-2015 -->
<meta name=viewport content="width=device-width,minimum-scale=1,initial-scale=1,shrink-to-fit=no">
<!-- Required to make a valid HTML5 document. -->
<title>Sécurité et impression — David Larlet</title>
<!-- Generated from https://realfavicongenerator.net/ such a mess. -->
<link rel="apple-touch-icon" sizes="180x180" href="/static/david/icons/apple-touch-icon.png">
<link rel="icon" type="image/png" sizes="32x32" href="/static/david/icons/favicon-32x32.png">
<link rel="icon" type="image/png" sizes="16x16" href="/static/david/icons/favicon-16x16.png">
<link rel="manifest" href="/manifest.json">
<link rel="mask-icon" href="/static/david/icons/safari-pinned-tab.svg" color="#5bbad5">
<link rel="shortcut icon" href="/static/david/icons/favicon.ico">
<meta name="apple-mobile-web-app-title" content="David Larlet">
<meta name="application-name" content="David Larlet">
<meta name="msapplication-TileColor" content="#da532c">
<meta name="msapplication-config" content="/static/david/icons/browserconfig.xml">
<meta name="theme-color" content="#f0f0ea">
<!-- That good ol' feed, subscribe :p. -->
<link rel=alternate type="application/atom+xml" title=Feed href="/david/log/">

  <!-- Canonical URL for SEO purposes -->
  <link rel="canonical" href="https://larlet.fr/david/stream/2015/11/21/">

<style>
/* http://meyerweb.com/eric/tools/css/reset/ */
html, body, div, span,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, address, big, cite, code,
del, dfn, em, img, ins,
small, strike, strong, tt, var,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, canvas, details, embed,
figure, figcaption, footer, header, hgroup,
menu, nav, output, ruby, section, summary,
time, mark, audio, video {
  margin: 0;
  padding: 0;
  border: 0;
  font-size: 100%;
  font: inherit;
  vertical-align: baseline;
}
/* HTML5 display-role reset for older browsers */
article, aside, details, figcaption, figure,
footer, header, hgroup, menu, nav, section { display: block; }
body { line-height: 1; }
blockquote, q { quotes: none; }
blockquote:before, blockquote:after,
q:before, q:after {
  content: '';
  content: none;
}
table {
  border-collapse: collapse;
  border-spacing: 0;
}

/* http://practicaltypography.com/equity.html */
/* https://calendar.perfplanet.com/2016/no-font-face-bulletproof-syntax/ */
/* https://www.filamentgroup.com/lab/js-web-fonts.html */
@font-face {
  font-family: 'EquityTextB';
  src: url('/static/david/css/fonts/Equity-Text-B-Regular-webfont.woff2') format('woff2'),
       url('/static/david/css/fonts/Equity-Text-B-Regular-webfont.woff') format('woff');
  font-weight: 300;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'EquityTextB';
  src: url('/static/david/css/fonts/Equity-Text-B-Italic-webfont.woff2') format('woff2'),
       url('/static/david/css/fonts/Equity-Text-B-Italic-webfont.woff') format('woff');
  font-weight: 300;
  font-style: italic;
  font-display: swap;
}
@font-face {
  font-family: 'EquityTextB';
  src: url('/static/david/css/fonts/Equity-Text-B-Bold-webfont.woff2') format('woff2'),
       url('/static/david/css/fonts/Equity-Text-B-Bold-webfont.woff') format('woff');
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'TriplicateT4c';
  src: url('/static/david/css/fonts/Triplicate-T4-Code-Regular-webfont.woff2') format('woff2'),
       url('/static/david/css/fonts/Triplicate-T4-Code-Regular-webfont.woff') format('woff');
  font-weight: 300;
  font-style: normal;
  font-display: swap;
}

/* http://practice.typekit.com/lesson/caring-about-opentype-features/ */
body {
  /* http://www.cssfontstack.com/ Palatino 99% Win 86% Mac */
  font-family: "EquityTextB", Palatino, serif;
  background-color: #f0f0ea;
  color: #07486c;
  font-kerning: normal;
  -moz-osx-font-smoothing: grayscale;
  -webkit-font-smoothing: subpixel-antialiased;
  text-rendering: optimizeLegibility;
  font-variant-ligatures: common-ligatures contextual;
  font-feature-settings: "kern", "liga", "clig", "calt";
}
pre, code, kbd, samp, var, tt {
  font-family: 'TriplicateT4c', monospace;
}
em {
  font-style: italic;
  color: #323a45;
}
strong {
  font-weight: bold;
  color: black;
}
nav {
  background-color: #323a45;
  color: #f0f0ea;
  display: flex;
  justify-content: space-around;
  padding: 1rem .5rem;
}
  nav:first-child {
    border-top: 1vh solid #2d7474;
  }
  nav:last-child {
    border-bottom: 1vh solid #2d7474;
  }
  nav a {
    color: #f0f0ea;
  }
  nav abbr {
    border-bottom: 1px dotted white;
  }

h1 {
  border-bottom: .2vh solid #2d7474;
  background-color: #e3e1e1;
  color: #323a45;
  text-align: center;
  padding: 2rem 0 1rem;
  width: 100%;
}
h2 {
  margin: 4rem 0 1rem;
  border-top: .2vh solid #2d7474;
}
h3 {
  text-align: center;
  margin: 3rem 0 .75em;
}
hr {
  height: .4rem;
  width: .4rem;
  border-radius: .4rem;
  background: #07486c;
  margin: 2.5rem auto;
}
time {
  display: bloc;
  background-color: #2d7474;
  color: #e3e1e1;
  padding: .29rem 1rem;
  float: right;
}
ul, ol {
  margin: 2rem;
}
ul {
  list-style-type: square;
}
a {
  text-decoration-skip-ink: auto;
}
article {
  max-width: 50rem;
  display: flex;
  flex-direction: column;
  margin: 3rem auto 1rem auto;
}
  article p:last-child {
    margin-bottom: 1rem;
  }
p {
  padding: 0 .5rem;
}
  p + p {
    margin-top: 2rem;
  }

blockquote {
  background-color: #e3e1e1;
  border-left: .5vw solid #2d7474;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 1rem;
  margin: 1.5rem;
}
  blockquote cite {
    font-style: italic;
  }

figure {
  border-top: .2vh solid #2d7474;
  background-color: #e3e1e1;
  text-align: center;
  padding: 1.5rem 0;
  margin: 1rem 0 0;
  font-size: 1.5rem;
  width: 100%;
}
  figure img {
    width: 250px;
    height: 250px;
    border: .5vw solid #323a45;
    padding: 1px;
  }
figcaption {
  padding: 1rem;
  line-height: 1.4;
}
aside {
  display: flex;
  flex-direction: column;
  background-color: #e3e1e1;
  padding: 1rem 0;
  border-bottom: .2vh solid #07486c;
}
  aside p {
    max-width: 50rem;
    margin: 0 auto;
  }

/* https://fvsch.com/code/css-locks/ */
p, li, pre, code, kbd, samp, var, tt, time {
  font-size: .95rem;
  line-height: calc( 1.5em + 0.2 * 1rem );
}
h1 {
  font-size: 1.7rem;
  line-height: calc( 1.2em + 0.2 * 1rem );
}
h2 {
  font-size: 1.6rem;
  line-height: calc( 1.3em + 0.2 * 1rem );
}
h3 {
  font-size: 1.35rem;
  line-height: calc( 1.4em + 0.2 * 1rem );
}
@media (min-width: 20em) {
  /* The (100vw - 20rem) / (50 - 20) part
     resolves to 0-1rem, depending on the
     viewport width (between 20em and 50em). */
  p, li, pre, code, kbd, samp, var, tt, time {
    font-size: calc( .95rem + .6 * (100vw - 20rem) / (50 - 20) );
    line-height: calc( 1.5em + 0.2 * (100vw - 50rem) / (20 - 50) );
  }
  h1 {
    font-size: calc( 1.7rem + 1.5 * (100vw - 20rem) / (50 - 20) );
    line-height: calc( 1.2em + 0.2 * (100vw - 50rem) / (20 - 50) );
  }
  h2 {
    font-size: calc( 1.5rem + 1.5 * (100vw - 20rem) / (50 - 20) );
    line-height: calc( 1.3em + 0.2 * (100vw - 50rem) / (20 - 50) );
  }
  h3 {
    font-size: calc( 1.35rem + 1.5 * (100vw - 20rem) / (50 - 20) );
    line-height: calc( 1.4em + 0.2 * (100vw - 50rem) / (20 - 50) );
  }
}
@media (min-width: 50em) {
  /* The right part of the addition *must* be a
     rem value. In this example we *could* change
     the whole declaration to font-size:2.5rem,
     but if our baseline value was not expressed
     in rem we would have to use calc. */
  p, li, pre, code, kbd, samp, var, tt, time {
    font-size: calc( .95rem + .6 * 1rem );
    line-height: 1.5em;
  }
  h1 {
    font-size: calc( 1.7rem + 1.5 * 1rem );
    line-height: 1.2em;
  }
  h2 {
    font-size: calc( 1.5rem + 1.5 * 1rem );
    line-height: 1.3em;
  }
  h3 {
    font-size: calc( 1.35rem + 1.5 * 1rem );
    line-height: 1.4em;
  }
  figure img {
    width: 500px;
    height: 500px;
  }
  blockquote {
    margin-left: -1.5rem;
  }
}

figure.unsquared {
  margin-bottom: 1.5rem;
}
  figure.unsquared img {
    height: inherit;
  }

/* https://github.com/richleland/pygments-css */
.codehilite{
    background-color: #fdf6e3;
    margin: 1rem auto;
    padding: 1rem;
    overflow-x:auto;
    box-shadow:inset 0 0 2px rgba(0,0,0,0.2)
}
.codehilite .t{color:#586e75}
.codehilite .w{color:#073642}
.codehilite .err{color:#cb4b16}
.codehilite .k{color:#859900}
.codehilite .kc{color:#2aa198}
.codehilite .kd{color:#268bd2}
.codehilite .kn{color:#b58900}
.codehilite .kp{color:#859900}
.codehilite .kr{color:#073642}
.codehilite .kt{color:#b58900}
.codehilite .n{color:#586e75}
.codehilite .na{color:#2aa198}
.codehilite .nb{color:#268bd2}
.codehilite .nc{color:#268bd2}
.codehilite .ne{color:#cb4b16}
.codehilite .no{color:#2aa198}
.codehilite .nd{color:#2aa198}
.codehilite .ni{color:#2aa198;font-weight:bold}
.codehilite .nf{color:#268bd2}
.codehilite .nn{color:#586e75}
.codehilite .nt{color:#2aa198;font-weight:bold}
.codehilite .nv{color:#cb4b16}
.codehilite .b{color:#859900}
.codehilite .bp{color:#586e75}
.codehilite .v{color:#586e75}
.codehilite .vc{color:#586e75}
.codehilite .vg{color:#268bd2}
.codehilite .vi{color:#268bd2}
.codehilite .m{color:#268bd2}
.codehilite .mf{color:#268bd2}
.codehilite .mh{color:#268bd2}
.codehilite .mi{color:#268bd2}
.codehilite .mo{color:#268bd2}
.codehilite .s{color:#2aa198}
.codehilite .sb{color:#2aa198}
.codehilite .sc{color:#2aa198}
.codehilite .sd{color:#2aa198}
.codehilite .s2{color:#2aa198}
.codehilite .se{color:#cb4b16}
.codehilite .sh{color:#2aa198}
.codehilite .si{color:#cb4b16}
.codehilite .sx{color:#2aa198}
.codehilite .sr{color:#cb4b16}
.codehilite .s1{color:#2aa198}
.codehilite .ss{color:#cb4b16}
.codehilite .il{color:#268bd2}
.codehilite .o{color:#586e75}
.codehilite .ow{color:#859900}
.codehilite .p{color:#586e75}
.codehilite .c{color:#93a1a1;font-style:italic}
.codehilite .cm{color:#93a1a1}
.codehilite .cp{color:#93a1a1}
.codehilite .c1{color:#93a1a1}
.codehilite .cs{color:#93a1a1}
.codehilite .hll{background-color:#dc322f}
.codehilite .g{color:#586e75}
.codehilite .gd{color:#586e75}
.codehilite .ge{font-style:italic}
.codehilite .gr{color:#586e75}
.codehilite .gh{color:#586e75;font-weight:bold}
.codehilite .gi{color:#586e75}
.codehilite .go{color:#586e75}
.codehilite .gp{color:#586e75}
.codehilite .gs{font-weight:bold}
.codehilite .gu{color:#586e75;font-weight:bold}
.codehilite .gt{color:#586e75}

@media print {
  body { font-size: 100%; }
  a:after { content: " (" attr(href) ")"; }
  a, a:link, a:visited, a:after {
    text-decoration: underline;
    text-shadow: none !important;
    background-image: none !important;
    background: white;
    color: black;
  }
  abbr[title] { border-bottom: 0; }
  abbr[title]:after { content: " (" attr(title) ")"; }
  img { page-break-inside: avoid; }
  @page { margin: 2cm .5cm; }
  h1, h2, h3 { page-break-after: avoid; }
  p3 { orphans: 3; widows: 3; }
  img {
    max-width: 250px !important;
    max-height: 250px !important;
  }
  nav, aside { display: none; }
}

/* Dark theme */
[lang=en] body {
  background: #323a45;
}
  [lang=en] article,
  [lang=en] article em,
  [lang=en] article strong {
    color: #f0f0ea;
  }
    [lang=en] article a {
      color: #ffbd2b;
    }
    [lang=en] article a:visited {
      color: #ff6b03;
    }
  [lang=en] blockquote,
  [lang=en] figure {
    background: #111930;
    color: #ccc;
  }
</style>
<nav>
  <p>
    <a href="/david/" title="Profil public">David&nbsp;Larlet</a> partage ses <a href="/david/blog/" title="Expériences bienveillantes">réflexions</a> et sa <a href="/david/stream/2019/" title="Pensées (dés)articulées">veille hebdomadaire</a>.
  </p>
</nav>

<h1>Sécurité et impression</h1>
<time>2015-11-21</time>
<article>
  <blockquote>
<p><a href="/david/stream/2015/10/16/">Une clé GPG en QR-code</a>, pourquoi pas, mais il ne faut pas le générer à partir d’un outil en ligne, fût-il hébergé par lehollandaisvolant (la clé privée ne doit jamais partir sur le réseau) :)</p>
<p>Pour la même raison, éviter de l’imprimer sur une imprimante réseau.</p>
<p>Pour le générer, <code>qrencode</code> le fait localement. Par contre pour le scanner, je n’ai pas d’outil sur PC (j’ai Barcode Scanner sur Android). Si tu en connais, ça m’intéresse :)</p>
</blockquote>
<p>Romain me rappelle à juste titre qu’une impression comporte des risques non négligeables. Du coup, si vous connaissez un moyen d’imprimer/scanner la clé GPG de manière sécurisée ça m’intéresse. Il faudrait pouvoir faire confiance à beaucoup d’intermédiaires sachant que les <em>drivers</em> d’imprimantes ne sont pas réputés pour être fiables…</p>
<p>Timo me précise par email le jour même que <a href="http://lehollandaisvolant.net/tout/tools/tools.7z">le code est téléchargeable</a> pour être exécuté en local et qu’il y a <a href="http://lehollandaisvolant.net/tout/tools/rqrcode/">un décodeur associé</a> utilisable à partir d’une webcam ou d’un fichier.</p>
</article>


<nav>
  <p>
    <a rel=prev href="/david/stream/2015/11/20/">← En guerre</a> | <a href="/david/stream/2015/" title="Retour à la liste complète">↑</a> | <a  rel=next href="/david/stream/2015/11/22/">Révolte et révolution →</a>
  </p>
</nav>


<aside>
  <p>
    Articles choisis :
    <a href="/david/blog/2018/commodite-effondrement/" title="Accéder à l’article complet">Commodité et effondrement</a>,
    <a href="/david/blog/2017/donnees-communs/" title="Accéder à l’article complet">Des données aux communs</a>,
    <a href="/david/blog/2016/accompagner-enfant/" title="Accéder à l’article complet">Accompagner un enfant</a>,
    <a href="/david/blog/2016/senior-developer/" title="Accéder à l’article complet">Senior developer</a>,
    <a href="/david/blog/2016/illusion-sociale/" title="Accéder à l’article complet">L’illusion sociale</a>,
    <a href="/david/blog/2016/instantane-scopyleft/" title="Accéder à l’article complet">Instantané Scopyleft</a>,
    <a href="/david/blog/2016/enseigner-web/" title="Accéder à l’article complet">Enseigner le Web</a>,
    <a href="/david/blog/2016/simplicite-defaut/" title="Accéder à l’article complet">Simplicité par défaut</a>,
    <a href="/david/blog/2016/minimalisme-esthetique/" title="Accéder à l’article complet">Minimalisme et esthétique</a>,
    <a href="/david/blog/2015/travail-transition/" title="Accéder à l’article complet">Travail en transition</a>,
    <a href="/david/blog/2015/pairmutation-travail/" title="Accéder à l’article complet">La pairmutation du travail</a>,
    <a href="/david/blog/2015/principes-web/" title="Accéder à l’article complet">Principes Web</a>,
    <a href="/david/blog/2015/travail-transition/" title="Accéder à l’article complet">Travail en transition</a>,
    <a href="/david/blog/2014/un-web-omni-present/" title="Accéder à l’article complet">Un web omni-présent</a>,
    <a href="/david/blog/2014/manifeste-developpeur/" title="Accéder à l’article complet">Manifeste de développeur</a>,
    <a href="/david/blog/2013/confort-convivialite/" title="Accéder à l’article complet">Confort et convivialité</a>,
    <a href="/david/blog/2013/testament-numerique/" title="Accéder à l’article complet">Testament numérique</a>,
    et <a href="/david/blog/" title="Accéder aux archives">bien d’autres…</a>
  </p>
</aside>


<nav>
  <p>
    <abbr title="Lieu de vie et de potentielles rencontres actuel">Montréal</abbr> ·
    <a href="mailto:david%40larlet.fr" title="Envoyer un courriel">Contact</a> ·
    <a href="http://larlet.com" title="Identité professionnelle">[Travailler ensemble ?]</a> ·
    <abbr title="Alwaysdata, 62 rue Tiquetonne 75002 Paris, +33.184162340">Hébergeur</abbr> ·
    <a href="/david/log/" title="S’abonner aux publications via RSS">Flux</a>
  </p>
</nav>

  <script>
  /* Service workers */
  if (navigator.serviceWorker) {
    window.addEventListener('load', function () {
      var selector = 'a[href^="/david/cache/"], a[rel=prev], a[rel=next]'
      function sendLinks (selector) {
        var links = [].slice.call(document.querySelectorAll(selector)).map(function (link) {
          return link.getAttribute('href')
        })
        links.push(location.pathname)  // Put the current page in cache too.
        navigator.serviceWorker.controller.postMessage({ links: links })
      }
      navigator.serviceWorker.getRegistration()
        .then(function (registration) {
          if (!registration || !navigator.serviceWorker.controller) {
            return navigator.serviceWorker.register('/serviceworker.js')
              .then(navigator.serviceWorker.ready)
              .then(function () {
                console.log('[ServiceWorker] Ready to go!')
              })
              .catch(console.error.bind(console))
          } else {
            console.log('[ServiceWorker] Send links via registration')
            sendLinks(selector)
          }
        })
      navigator.serviceWorker.addEventListener('controllerchange', function () {
        console.log('[ServiceWorker] Send links via controller change')
        sendLinks(selector)
      })
      navigator.serviceWorker.addEventListener('message', function (event) {
        var link = document.querySelector('a[href="' + event.data.link + '"]')
        if (event.data.status && link) {
          link.style.backgroundColor = '#2d7474'
          link.style.color = '#f0f0ea'
          
            link.setAttribute('title', 'En cache pour consultation sans connexion')
          
        }
      })
    })
  } else {
    console.warn('[ServiceWorker] No cache for old browsers.')
  }
</script>