diff --git a/book/source/diag/subkey_binding_backsig.png b/book/source/diag/subkey_binding_backsig.png
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diff --git a/book/source/diag/subkey_binding_backsig.svg b/book/source/diag/subkey_binding_backsig.svg
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+         x="71.898506"
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+         id="tspan5177">(for certification)</tspan></text>
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+         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:2.82222px;font-family:sans-serif;-inkscape-font-specification:'sans-serif, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-east-asian:normal;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.2;stroke-dasharray:none;stroke-opacity:1"
+         x="35.653236"
+         y="109.62244"
+         id="tspan17565">This arrow is a shorthand for</tspan><tspan
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+         x="107.94159"
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+         id="tspan13837"> Primary key creates a</tspan><tspan
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+         x="107.94159"
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+         id="tspan13839">    &quot;subkey binding</tspan><tspan
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+         x="107.94159"
+         y="79.403572"
+         id="tspan9">     signature&quot;</tspan><tspan
+         sodipodi:role="line"
+         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:2.82222px;font-family:'Courier 10 Pitch';-inkscape-font-specification:'Courier 10 Pitch, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-east-asian:normal;fill:#ff0000;fill-opacity:1;stroke:none;stroke-width:0.2;stroke-dasharray:none;stroke-opacity:1"
+         x="107.94159"
+         y="82.931351"
+         id="tspan18684">      to associate the </tspan><tspan
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+         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:2.82222px;font-family:'Courier 10 Pitch';-inkscape-font-specification:'Courier 10 Pitch, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-east-asian:normal;fill:#ff0000;fill-opacity:1;stroke:none;stroke-width:0.2;stroke-dasharray:none;stroke-opacity:1"
+         x="107.94159"
+         y="86.459122"
+         id="tspan18686">       subkey with itself</tspan></text>
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+         x="46.848679"
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+         id="tspan2111-9">key creation time</tspan><tspan
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+         id="tspan2143-5-3">OpenPGP subkey</tspan><tspan
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+         x="50.257763"
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+         id="tspan602">(for signing)</tspan></text>
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+         x="94.361412"
+         y="183.71982"
+         id="tspan602-7">Subkey binding signature</tspan></text>
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+         x="99.450737"
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+    <text
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+       x="91.595093"
+       y="111.6011"
+       id="text4813-35-6"><tspan
+         sodipodi:role="line"
+         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:3.52778px;font-family:'Courier 10 Pitch';-inkscape-font-specification:'Courier 10 Pitch, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-east-asian:normal;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.2;stroke-dasharray:none;stroke-opacity:1"
+         x="91.595093"
+         y="111.6011"
+         id="tspan14771">Signature over:</tspan><tspan
+         sodipodi:role="line"
+         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:3.52778px;font-family:'Courier 10 Pitch';-inkscape-font-specification:'Courier 10 Pitch, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-east-asian:normal;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.2;stroke-dasharray:none;stroke-opacity:1"
+         x="91.595093"
+         y="116.01082"
+         id="tspan2">primary key</tspan><tspan
+         sodipodi:role="line"
+         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:3.52778px;font-family:'Courier 10 Pitch';-inkscape-font-specification:'Courier 10 Pitch, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-east-asian:normal;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.2;stroke-dasharray:none;stroke-opacity:1"
+         x="91.595093"
+         y="120.42055"
+         id="tspan17"> + subkey</tspan><tspan
+         sodipodi:role="line"
+         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:3.52778px;font-family:'Courier 10 Pitch';-inkscape-font-specification:'Courier 10 Pitch, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-east-asian:normal;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.2;stroke-dasharray:none;stroke-opacity:1"
+         x="91.595093"
+         y="124.83027"
+         id="tspan6" /><tspan
+         sodipodi:role="line"
+         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:3.52778px;font-family:'Courier 10 Pitch';-inkscape-font-specification:'Courier 10 Pitch, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-east-asian:normal;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.2;stroke-dasharray:none;stroke-opacity:1"
+         x="91.595093"
+         y="129.23999"
+         id="tspan1"> + additional metadata</tspan><tspan
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+         x="91.595093"
+         y="133.64972"
+         id="tspan5">    (subpackets):</tspan><tspan
+         sodipodi:role="line"
+         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:3.52778px;font-family:'Courier 10 Pitch';-inkscape-font-specification:'Courier 10 Pitch, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-east-asian:normal;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.2;stroke-dasharray:none;stroke-opacity:1"
+         x="91.595093"
+         y="138.05945"
+         id="tspan10" /><tspan
+         sodipodi:role="line"
+         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:3.52778px;font-family:'Courier 10 Pitch';-inkscape-font-specification:'Courier 10 Pitch, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-east-asian:normal;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.2;stroke-dasharray:none;stroke-opacity:1"
+         x="91.595093"
+         y="142.46918"
+         id="tspan11">- Embedded Signature</tspan><tspan
+         sodipodi:role="line"
+         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:3.52778px;font-family:'Courier 10 Pitch';-inkscape-font-specification:'Courier 10 Pitch, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-east-asian:normal;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.2;stroke-dasharray:none;stroke-opacity:1"
+         x="91.595093"
+         y="146.87889"
+         id="tspan12">  &quot;Primary Key Binding&quot;</tspan><tspan
+         sodipodi:role="line"
+         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:3.52778px;font-family:'Courier 10 Pitch';-inkscape-font-specification:'Courier 10 Pitch, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-east-asian:normal;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.2;stroke-dasharray:none;stroke-opacity:1"
+         x="91.595093"
+         y="151.28862"
+         id="tspan15">          (Signature over</tspan><tspan
+         sodipodi:role="line"
+         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:3.52778px;font-family:'Courier 10 Pitch';-inkscape-font-specification:'Courier 10 Pitch, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-east-asian:normal;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.2;stroke-dasharray:none;stroke-opacity:1"
+         x="91.595093"
+         y="155.69835"
+         id="tspan16">           primary + subkey)</tspan><tspan
+         sodipodi:role="line"
+         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:3.52778px;font-family:'Courier 10 Pitch';-inkscape-font-specification:'Courier 10 Pitch, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-east-asian:normal;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.2;stroke-dasharray:none;stroke-opacity:1"
+         x="91.595093"
+         y="160.10808"
+         id="tspan8" /><tspan
+         sodipodi:role="line"
+         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:3.52778px;font-family:'Courier 10 Pitch';-inkscape-font-specification:'Courier 10 Pitch, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-east-asian:normal;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.2;stroke-dasharray:none;stroke-opacity:1"
+         x="91.595093"
+         y="164.51779"
+         id="tspan14777">- signature creation time</tspan><tspan
+         sodipodi:role="line"
+         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:3.52778px;font-family:'Courier 10 Pitch';-inkscape-font-specification:'Courier 10 Pitch, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-east-asian:normal;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.2;stroke-dasharray:none;stroke-opacity:1"
+         x="91.595093"
+         y="168.92752"
+         id="tspan13456">- key expiration time</tspan><tspan
+         sodipodi:role="line"
+         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:3.52778px;font-family:'Courier 10 Pitch';-inkscape-font-specification:'Courier 10 Pitch, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-east-asian:normal;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.2;stroke-dasharray:none;stroke-opacity:1"
+         x="91.595093"
+         y="173.33725"
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