From 65cf7fbcf932a8406f3aa6e2a11aa4b1b7a692b7 Mon Sep 17 00:00:00 2001
From: Paul Schaub <vanitasvitae@fsfe.org>
Date: Fri, 8 Dec 2023 16:21:45 +0100
Subject: [PATCH] Improve diagrams

---
 book/source/11-decryption.md                  |  8 +--
 book/source/drawio/PKESKv3-decryption.drawio  | 30 ++++----
 book/source/drawio/PKESKv3-decryption.svg     |  2 +-
 book/source/drawio/SEIPDv1-decryption.drawio  | 48 +++++++------
 book/source/drawio/SEIPDv1-decryption.svg     |  2 +-
 .../SEIPDv2-decryption-mk-derivation.drawio   | 63 ++++++++--------
 .../SEIPDv2-decryption-mk-derivation.svg      |  2 +-
 book/source/drawio/SKESKv4-decryption.drawio  | 71 ++++++++++---------
 book/source/drawio/SKESKv4-decryption.svg     |  2 +-
 9 files changed, 115 insertions(+), 113 deletions(-)

diff --git a/book/source/11-decryption.md b/book/source/11-decryption.md
index 778c19a..88d7099 100644
--- a/book/source/11-decryption.md
+++ b/book/source/11-decryption.md
@@ -128,13 +128,7 @@ Since SEIPD version 1 is susceptible to downgrade attacks under certain scenario
 ```
 
 To decrypt the contents of a version 1 SEIPD packet, the session-key obtained in the previous step is used.
-The cipher algorithm is determined by TODO.
-
-```{admonition} TODO
-:class: warning
-
-Describe in detail, how the cipher algorithm is obtained.
-```
+The cipher algorithm is either extracted from the decrypted session-key (the algorithm ID is typically prefixed to the decrypted session-key), or - in case of a SKESK packet using the direct-method - taken from the SKESKs cipher algorithm field. 
 
 Once the cipher is initialized, the whole encrypted data from the SEIPD packet is decrypted.
 
diff --git a/book/source/drawio/PKESKv3-decryption.drawio b/book/source/drawio/PKESKv3-decryption.drawio
index 235b4f1..b6e37fe 100644
--- a/book/source/drawio/PKESKv3-decryption.drawio
+++ b/book/source/drawio/PKESKv3-decryption.drawio
@@ -1,28 +1,28 @@
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   <diagram name="Seite-1" id="ocT50L08296YUH-PY7lG">
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-        <mxCell id="h-jzOOFD72CvbkbpJgZJ-4" value="&lt;div&gt;Secret Key&lt;/div&gt;Key-ID: 0xB0B" style="shape=hexagon;perimeter=hexagonPerimeter2;whiteSpace=wrap;html=1;fixedSize=1;" vertex="1" parent="1">
+        <mxCell id="h-jzOOFD72CvbkbpJgZJ-4" value="&lt;div&gt;Secret Key&lt;/div&gt;Key-ID: 0xB0B" style="shape=hexagon;perimeter=hexagonPerimeter2;whiteSpace=wrap;html=1;fixedSize=1;" parent="1" vertex="1">
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+        <mxCell id="h-jzOOFD72CvbkbpJgZJ-68" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;exitX=0.5;exitY=1;exitDx=0;exitDy=0;entryX=0.5;entryY=0;entryDx=0;entryDy=0;" parent="1" source="h-jzOOFD72CvbkbpJgZJ-14" target="h-jzOOFD72CvbkbpJgZJ-64" edge="1">
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-        <mxCell id="h-jzOOFD72CvbkbpJgZJ-14" value="&lt;div&gt;Asymmetric&lt;/div&gt;&lt;div&gt;Decryption&lt;br&gt;&lt;/div&gt;" style="rhombus;whiteSpace=wrap;html=1;" vertex="1" parent="1">
+        <mxCell id="h-jzOOFD72CvbkbpJgZJ-14" value="&lt;div&gt;Asymmetric&lt;/div&gt;&lt;div&gt;Decryption&lt;br&gt;&lt;/div&gt;" style="rhombus;whiteSpace=wrap;html=1;" parent="1" vertex="1">
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         </mxCell>
-        <mxCell id="h-jzOOFD72CvbkbpJgZJ-64" value="Symmetric Key" style="rounded=0;whiteSpace=wrap;html=1;" vertex="1" parent="1">
+        <mxCell id="h-jzOOFD72CvbkbpJgZJ-64" value="&lt;div&gt;Cipher Algorithm&lt;/div&gt;&lt;div&gt;+&lt;/div&gt;&lt;div&gt;Session Key&lt;br&gt;&lt;/div&gt;" style="rounded=0;whiteSpace=wrap;html=1;" parent="1" vertex="1">
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         </mxCell>
-        <mxCell id="h-jzOOFD72CvbkbpJgZJ-2" value="" style="rounded=0;whiteSpace=wrap;html=1;" vertex="1" parent="1">
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+        <mxCell id="h-jzOOFD72CvbkbpJgZJ-15" value="" style="curved=1;endArrow=classic;html=1;rounded=0;exitX=0;exitY=0.5;exitDx=0;exitDy=0;shape=flexArrow;entryX=1;entryY=0.5;entryDx=0;entryDy=0;width=10;endSize=4;" parent="1" source="h-jzOOFD72CvbkbpJgZJ-7" target="h-jzOOFD72CvbkbpJgZJ-14" edge="1">
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@@ -31,24 +31,24 @@
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-        <mxCell id="h-jzOOFD72CvbkbpJgZJ-3" value="&lt;div&gt;PKESKv3&lt;/div&gt;" style="text;html=1;strokeColor=none;fillColor=none;align=center;verticalAlign=middle;whiteSpace=wrap;rounded=0;" vertex="1" parent="1">
+        <mxCell id="h-jzOOFD72CvbkbpJgZJ-3" value="&lt;div&gt;PKESKv3&lt;/div&gt;" style="text;html=1;strokeColor=none;fillColor=none;align=center;verticalAlign=middle;whiteSpace=wrap;rounded=0;" parent="1" vertex="1">
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-        <mxCell id="h-jzOOFD72CvbkbpJgZJ-5" value="Key-ID: 0xB0B" style="rounded=0;whiteSpace=wrap;html=1;" vertex="1" parent="1">
+        <mxCell id="h-jzOOFD72CvbkbpJgZJ-5" value="Key-ID: 0xB0B" style="rounded=0;whiteSpace=wrap;html=1;" parent="1" vertex="1">
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-        <mxCell id="h-jzOOFD72CvbkbpJgZJ-7" value="Asymmetric Algo." style="rounded=0;whiteSpace=wrap;html=1;" vertex="1" parent="1">
+        <mxCell id="h-jzOOFD72CvbkbpJgZJ-7" value="Asymmetric Algo." style="rounded=0;whiteSpace=wrap;html=1;" parent="1" vertex="1">
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-        <mxCell id="h-jzOOFD72CvbkbpJgZJ-9" value="Enc. Session-Key" style="rounded=0;whiteSpace=wrap;html=1;" vertex="1" parent="1">
+        <mxCell id="h-jzOOFD72CvbkbpJgZJ-9" value="Enc. Session-Key" style="rounded=0;whiteSpace=wrap;html=1;" parent="1" vertex="1">
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diff --git a/book/source/drawio/PKESKv3-decryption.svg b/book/source/drawio/PKESKv3-decryption.svg
index 28e9267..da7e8d6 100644
--- a/book/source/drawio/PKESKv3-decryption.svg
+++ b/book/source/drawio/PKESKv3-decryption.svg
@@ -1,4 +1,4 @@
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diff --git a/book/source/drawio/SEIPDv1-decryption.drawio b/book/source/drawio/SEIPDv1-decryption.drawio
index 4e86af7..adf2f4c 100644
--- a/book/source/drawio/SEIPDv1-decryption.drawio
+++ b/book/source/drawio/SEIPDv1-decryption.drawio
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diff --git a/book/source/drawio/SEIPDv1-decryption.svg b/book/source/drawio/SEIPDv1-decryption.svg
index 09c1962..708593e 100644
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+++ b/book/source/drawio/SEIPDv1-decryption.svg
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text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 118px; height: 1px; padding-top: 275px; margin-left: 141px;"><div style="box-sizing: border-box; font-size: 0px; text-align: center;" data-drawio-colors="color: rgb(0, 0, 0); "><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;">Plaintext</div></div></div></foreignObject><text x="200" y="279" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">Plaintext</text></switch></g><rect x="0" y="30" width="120" height="60" fill="rgb(255, 255, 255)" stroke="rgb(0, 0, 0)" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 118px; height: 1px; padding-top: 60px; margin-left: 1px;"><div style="box-sizing: border-box; font-size: 0px; text-align: center;" data-drawio-colors="color: rgb(0, 0, 0); "><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;">Cipher Algorithm</div></div></div></foreignObject><text x="60" y="64" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">Cipher Algorithm</text></switch></g><rect x="30" y="0" width="200" height="30" fill="none" stroke="none" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; 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diff --git a/book/source/drawio/SEIPDv2-decryption-mk-derivation.drawio b/book/source/drawio/SEIPDv2-decryption-mk-derivation.drawio
index 5f7dba1..24dfd8d 100644
--- a/book/source/drawio/SEIPDv2-decryption-mk-derivation.drawio
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diff --git a/book/source/drawio/SEIPDv2-decryption-mk-derivation.svg b/book/source/drawio/SEIPDv2-decryption-mk-derivation.svg
index 7491d2d..0619eda 100644
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\ No newline at end of file
diff --git a/book/source/drawio/SKESKv4-decryption.drawio b/book/source/drawio/SKESKv4-decryption.drawio
index 0a8c28f..d7c71b5 100644
--- a/book/source/drawio/SKESKv4-decryption.drawio
+++ b/book/source/drawio/SKESKv4-decryption.drawio
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diff --git a/book/source/drawio/SKESKv4-decryption.svg b/book/source/drawio/SKESKv4-decryption.svg
index 879f6bc..c168a78 100644
--- a/book/source/drawio/SKESKv4-decryption.svg
+++ b/book/source/drawio/SKESKv4-decryption.svg
@@ -1,4 +1,4 @@
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text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 98px; height: 1px; padding-top: 198px; margin-left: 371px;"><div style="box-sizing: border-box; font-size: 0px; text-align: center;" data-drawio-colors="color: rgb(0, 0, 0); "><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;">Enc. 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text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 285px; margin-left: 184px;"><div style="box-sizing: border-box; font-size: 0px; text-align: center;" data-drawio-colors="color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); "><div style="display: inline-block; font-size: 11px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; background-color: rgb(255, 255, 255); white-space: nowrap;">no</div></div></div></foreignObject><text x="184" y="289" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="11px" text-anchor="middle">no</text></switch></g><path d="M 185 170 L 255 240 L 185 310 Z" fill="rgb(255, 255, 255)" stroke="rgb(0, 0, 0)" stroke-miterlimit="10" transform="rotate(270,220,240)" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 138px; height: 1px; padding-top: 240px; margin-left: 151px;"><div style="box-sizing: border-box; font-size: 0px; text-align: center;" data-drawio-colors="color: rgb(0, 0, 0); "><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;"><div><br /></div><div>Is</div><div>Encrypted</div><div>Session-Key</div><div>present<br /></div></div></div></div></foreignObject><text x="220" y="244" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">Is...</text></switch></g><path d="M 320 365 L 320 375 L 235 375 L 235 393.63" fill="none" stroke="rgb(0, 0, 0)" stroke-miterlimit="10" pointer-events="stroke"/><path d="M 235 398.88 L 231.5 391.88 L 235 393.63 L 238.5 391.88 Z" fill="rgb(0, 0, 0)" stroke="rgb(0, 0, 0)" stroke-miterlimit="10" pointer-events="all"/><path d="M 320 285 L 370 325 L 320 365 L 270 325 Z" fill="rgb(255, 255, 255)" stroke="rgb(0, 0, 0)" stroke-miterlimit="10" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; 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text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 118px; height: 1px; padding-top: 430px; margin-left: 261px;"><div style="box-sizing: border-box; font-size: 0px; text-align: center;" data-drawio-colors="color: rgb(0, 0, 0); "><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;"><div>Cipher Algorithm</div><div>+</div><div>Session Key<br /></div></div></div></div></foreignObject><text x="320" y="434" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">Cipher Algorithm...</text></switch></g></g><switch><g requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"/><a transform="translate(0,-5)" xlink:href="https://www.drawio.com/doc/faq/svg-export-text-problems" target="_blank"><text text-anchor="middle" font-size="10px" x="50%" y="100%">Text is not SVG - cannot display</text></a></switch></svg>
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