diff --git a/book/source/10-encryption.md b/book/source/10-encryption.md
index fd555e9..cdde41e 100644
--- a/book/source/10-encryption.md
+++ b/book/source/10-encryption.md
@@ -107,7 +107,7 @@ In this version of the SEIPD packet, the session-key is used directly as message
 
 When communicating with a mix of recipients, some of whose OpenPGP software only supports OpenPGP version 4, then this mechanism must be used.
 
-```{figure} drawio/SEIPDv1-PKESK.png
+```{figure} drawio/SEIPDv1-PKESK.svg
 :name: fig-encryption-seipdv1-pkesk
 :alt: Depicts a dotted hexagon labeled "Plaintext", from which a curved arrow passes another dotted hexagon "Session Key" and finally points to a "SEIPDv1" packet. Two more curved arrows originate from the session key and pass Alice' and Bob's encryption key, ending in two PKESK packets.
 
@@ -127,7 +127,7 @@ In version 2 SEIPD, the *session key* is transformed into a *message key*, based
 The session-key can use a different symmetric algorithm than the message-key.
 ```
 
-```{figure} drawio/SEIPDv2-PKESK.png
+```{figure} drawio/SEIPDv2-PKESK.svg
 :name: fig-encryption-seipdv2-pkesk
 :alt: TODO
 
diff --git a/book/source/drawio/SEIPDv1-PKESK.png b/book/source/drawio/SEIPDv1-PKESK.png
deleted file mode 100644
index cb8d040..0000000
Binary files a/book/source/drawio/SEIPDv1-PKESK.png and /dev/null differ
diff --git a/book/source/drawio/SEIPDv1-PKESK.svg b/book/source/drawio/SEIPDv1-PKESK.svg
new file mode 100644
index 0000000..c8518d1
--- /dev/null
+++ b/book/source/drawio/SEIPDv1-PKESK.svg
@@ -0,0 +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: 118px; height: 1px; padding-top: 150px; margin-left: 331px;"><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>PKESK #1</div>0xBBBB...</div></div></div></foreignObject><text x="390" y="154" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">PKESK #10xBBBB...</text></switch></g><rect x="330" y="40" 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; 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\ No newline at end of file
diff --git a/book/source/drawio/SEIPDv2-PKESK.png b/book/source/drawio/SEIPDv2-PKESK.png
deleted file mode 100644
index f3151ca..0000000
Binary files a/book/source/drawio/SEIPDv2-PKESK.png and /dev/null differ
diff --git a/book/source/drawio/SEIPDv2-PKESK.svg b/book/source/drawio/SEIPDv2-PKESK.svg
new file mode 100644
index 0000000..33a2a52
--- /dev/null
+++ b/book/source/drawio/SEIPDv2-PKESK.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: 150px; margin-left: 331px;"><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>PKESK #1</div>0xBBBB...</div></div></div></foreignObject><text x="390" y="154" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">PKESK #10xBBBB...</text></switch></g><rect x="330" y="40" 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: 70px; margin-left: 331px;"><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>PKESK #0</div>0xAAAA...</div></div></div></foreignObject><text x="390" y="74" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">PKESK #00xAAAA...</text></switch></g><rect x="0" y="40" width="120" height="60" rx="9" ry="9" 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: 70px; 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;"><div>Alice'</div><div>Encryption Key</div><div>0xAAAA...<br /></div></div></div></div></foreignObject><text x="60" y="74" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">Alice'...</text></switch></g><rect x="0" y="120" width="120" height="60" rx="9" ry="9" 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; 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