diff --git a/idsig/Cargo.toml b/idsig/Cargo.toml
new file mode 100644
index 0000000..10790a7
--- /dev/null
+++ b/idsig/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "idsig"
+version = "0.1.0"
+authors = ["Jiyong Park <jiyong@google.com>"]
+edition = "2018"
+
+[dependencies]
+ring = "0.16"