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/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