diff --git a/src/main/java/com/loafle/overflow/core/type/CryptoType.java b/src/main/java/com/loafle/overflow/core/type/CryptoType.java
index 0a41689..bf490fc 100644
--- a/src/main/java/com/loafle/overflow/core/type/CryptoType.java
+++ b/src/main/java/com/loafle/overflow/core/type/CryptoType.java
@@ -4,6 +4,7 @@ package com.loafle.overflow.core.type;
  * Created by snoop on 17. 6. 27.
  */
 public enum CryptoType {
+    NONE(""),
     TLS("TLS");
 
     private String stringValue;