diff --git a/foo.txt b/foo.txt
new file mode 100644
index 0000000..504572a
--- /dev/null
+++ b/foo.txt
@@ -0,0 +1 @@
+substitution cipher
diff --git a/foo.txt.crypt b/foo.txt.crypt
new file mode 100644
index 0000000..f5ed6e1
--- /dev/null
+++ b/foo.txt.crypt
@@ -0,0 +1 @@
+VXEVWLWXWLRQ FLSKHU