diff --git a/.gitignore b/.gitignore
index b695b4c..65d7db3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 *.pdf
 *.epub
 Makefile
+*.xcf
diff --git a/slides/lfs/inferno.png b/slides/lfs/inferno.png
new file mode 100644
index 0000000..1cf2a8e
Binary files /dev/null and b/slides/lfs/inferno.png differ
diff --git a/slides/lfs/lfs.md b/slides/lfs/lfs.md
new file mode 100644
index 0000000..34a017e
--- /dev/null
+++ b/slides/lfs/lfs.md
@@ -0,0 +1,101 @@
+# The Horrifying Cost
+
+If a Git has 2806 commits, and you commit 15MB worth of output each time, then you are a menace and must be stopped.
+
+```text
+
+   2806 commits x 15MB = 41GB
+
+```
+
+# Initial Tactics: `.gitignore`
+
+```
+*.pdf
+*.epub
+Makefile
+*.xcf
+```
+
+...but sometimes it's not enough.
+
+# Saving Your Immortal Soul
+
+![Well deserved fate](slides/lfs/inferno.png)
+
+End the madness with git lfs.
+
+# Setup
+
+```bash
+
+apt install -y git-lfs
+cd $PROJECT
+git lfs install
+```
+
+## Output: Easy Hooks
+
+```bash
+cat ~/.git/hooks/pre-push
+```
+
+```
+#!/bin/sh
+command -v git-lfs >/dev/null 2>&1 || { echo >&2
+"This repository is configured for Git LFS but
+'git-lfs' was not found on your path. If you no
+longer wish to use Git LFS, remove this hook by
+deleting '.git/hooks/pre-push'."; exit 2; }
+
+
+git lfs pre-push "$@"
+```
+
+
+# Add Files
+
+Track all the files:
+
+```bash
+git lfs track "*.iso"
+git lfs track "*.png"
+git lfs track "*.jpg"
+git lfs track "*.jpeg"
+git lfs track "*.tiff"
+git lfs track "*.xlsx"
+git lfs track "*.docx"
+
+cat .gitattributes
+```
+Result:
+
+```
+*.jpg filter=lfs diff=lfs merge=lfs -text
+*.svg filter=lfs diff=lfs merge=lfs -text
+```
+
+Double check with `git lfs ls-files`.
+
+
+# Locking
+
+[ If your remote supports it ]
+lock your files when working on them.
+
+# Migration
+
+Make sure you have all the files:
+
+```bash
+git lfs fetch origin --all
+
+git lfs push $newRemote --all
+
+```
+
+# Problems
+
+`soft-serve` does not yet support `git-lfs`.
+
+(end list)
diff --git a/slides/rsa/dhke.xcf b/slides/rsa/dhke.xcf
deleted file mode 100644
index 79d9f1b..0000000
Binary files a/slides/rsa/dhke.xcf and /dev/null differ
diff --git a/slides/rsa/tor-onion-services.xcf b/slides/rsa/tor-onion-services.xcf
deleted file mode 100644
index e44670f..0000000
Binary files a/slides/rsa/tor-onion-services.xcf and /dev/null differ
diff --git a/slides/rsa/tor.xcf b/slides/rsa/tor.xcf
deleted file mode 100644
index e9b3094..0000000
Binary files a/slides/rsa/tor.xcf and /dev/null differ