diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..4a5fcae
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "cryptopp"]
+	path = cryptopp
+	url = https://github.com/weidai11/cryptopp.git
diff --git a/cryptopp b/cryptopp
new file mode 160000
index 0000000..0c82df1
--- /dev/null
+++ b/cryptopp
@@ -0,0 +1 @@
+Subproject commit 0c82df181c98912a01b00bed298b567724feafba