Update both forward and reverse mode crypto docs

They were written before HKDF was introduced.

Improve graphics as well

3 files changed, 733 insertions, 616 deletions

diff --git a/docs/img/file-content-encryption.svg b/docs/img/file-content-encryption.svg
index 6f054eb..dfde974 100644
--- a/docs/img/file-content-encryption.svg
+++ b/docs/img/file-content-encryption.svg
@@ -19,40 +19,40 @@
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-       inkscape:stockid="Arrow1Mend"
-       orient="auto"
-       refY="0"
-       refX="0"
-       id="marker5544"
+       inkscape:isstock="true"
        style="overflow:visible"
-       inkscape:isstock="true">
+       id="marker13917"
+       refX="0"
+       refY="0"
+       orient="auto"
+       inkscape:stockid="Arrow1Mend">
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-         style="fill:#000000;fill-opacity:1;fill-rule:evenodd;stroke:#000000;stroke-width:1pt;stroke-opacity:1"
+         inkscape:connector-curvature="0"
          transform="matrix(-0.4,0,0,-0.4,-4,0)"
-         inkscape:connector-curvature="0" />
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+         d="M 0,0 5,-5 -12.5,0 5,5 0,0 Z"
+         id="path13915" />
     </marker>
     <marker
        inkscape:stockid="Arrow1Mend"
        orient="auto"
        refY="0"
        refX="0"
-       id="marker9033"
+       id="marker13729"
        style="overflow:visible"
        inkscape:isstock="true"
        inkscape:collect="always">
       <path
-         id="path9035"
+         id="path13727"
          d="M 0,0 5,-5 -12.5,0 5,5 0,0 Z"
-         style="fill:#000000;fill-opacity:1;fill-rule:evenodd;stroke:#000000;stroke-width:1pt;stroke-opacity:1"
+         style="fill:#000000;fill-opacity:0.99607843;fill-rule:evenodd;stroke:#000000;stroke-width:1pt;stroke-opacity:0.99607843"
          transform="matrix(-0.4,0,0,-0.4,-4,0)"
          inkscape:connector-curvature="0" />
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     <marker
        inkscape:isstock="true"
        style="overflow:visible"
-       id="marker8949"
+       id="marker13671"
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        orient="auto"
@@ -61,21 +61,37 @@
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          transform="matrix(-0.4,0,0,-0.4,-4,0)"
-         style="fill:#000000;fill-opacity:1;fill-rule:evenodd;stroke:#000000;stroke-width:1pt;stroke-opacity:1"
+         style="fill:#000000;fill-opacity:0.99607843;fill-rule:evenodd;stroke:#000000;stroke-width:1pt;stroke-opacity:0.99607843"
          d="M 0,0 5,-5 -12.5,0 5,5 0,0 Z"
-         id="path8951" />
+         id="path13669" />
+    </marker>
+    <marker
+       inkscape:stockid="Arrow1Mend"
+       orient="auto"
+       refY="0"
+       refX="0"
+       id="marker5544"
+       style="overflow:visible"
+       inkscape:isstock="true"
+       inkscape:collect="always">
+      <path
+         id="path5546"
+         d="M 0,0 5,-5 -12.5,0 5,5 0,0 Z"
+         style="fill:#000000;fill-opacity:0.99607843;fill-rule:evenodd;stroke:#000000;stroke-width:1pt;stroke-opacity:0.99607843"
+         transform="matrix(-0.4,0,0,-0.4,-4,0)"
+         inkscape:connector-curvature="0" />
     </marker>
     <marker
        inkscape:stockid="Arrow1Mend"
        orient="auto"
        refY="0"
        refX="0"
-       id="marker8631"
+       id="marker9033"
        style="overflow:visible"
        inkscape:isstock="true"
        inkscape:collect="always">
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+         id="path9035"
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          transform="matrix(-0.4,0,0,-0.4,-4,0)"
@@ -84,7 +100,7 @@
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        inkscape:isstock="true"
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+       id="marker8949"
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@@ -95,7 +111,7 @@
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          d="M 0,0 5,-5 -12.5,0 5,5 0,0 Z"
-         id="path8561" />
+         id="path8951" />
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        inkscape:stockid="Arrow1Mend"
@@ -137,13 +153,13 @@
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      inkscape:pageshadow="2"
-     inkscape:zoom="1.979899"
-     inkscape:cx="325.88995"
-     inkscape:cy="143.0543"
+     inkscape:zoom="5.6"
+     inkscape:cx="315.34957"
+     inkscape:cy="136.91144"
      inkscape:document-units="px"
      inkscape:current-layer="layer1"
      showgrid="false"
-     showguides="false"
+     showguides="true"
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      inkscape:window-height="1016"
      inkscape:window-x="0"
@@ -156,7 +172,8 @@
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      inkscape:bbox-nodes="false"
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-     inkscape:document-rotation="0">
+     inkscape:document-rotation="0"
+     inkscape:guide-bbox="true">
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        id="grid4153"
@@ -166,6 +183,16 @@
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        originx="-58.710531"
        originy="-676.77163" />
+    <sodipodi:guide
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+       orientation="1,0"
+       id="guide13905"
+       inkscape:locked="false" />
+    <sodipodi:guide
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+       id="guide14057"
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@@ -388,34 +415,17 @@
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        id="path8737-5"
-       cx="403.82645"
+       cx="402.37164"
        cy="240.94487"
-       rx="5.3170557"
+       rx="2.674895"
        ry="5.31496" />
-    <path
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@@ -426,14 +436,14 @@
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-       x="423.86295"
-       y="213.29985"
+       x="465.70953"
+       y="214.10306"
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        transform="scale(1.0001971,0.99980293)"><tspan
          sodipodi:role="line"
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-         x="423.86295"
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+         x="465.70953"
+         y="214.10306"
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@@ -479,43 +489,65 @@
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+       x="315.77496"
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diff --git a/docs/img/reverse-derivePathIV.svg b/docs/img/reverse-derivePathIV.svg
index 622cec1..65e8e0a 100644
--- a/docs/img/reverse-derivePathIV.svg
+++ b/docs/img/reverse-derivePathIV.svg
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-   width="144.88924mm"
-   height="40.864796mm"
-   viewBox="0 0 513.38705 144.79651"
+   width="146.88574mm"
+   height="61.163269mm"
+   viewBox="0 0 520.46128 216.72024"
    id="svg2"
    version="1.1"
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+   inkscape:version="0.92+devel unknown"
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+         d="M 0,0 5,-5 -12.5,0 5,5 Z"
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