diff --git a/src/base32.js b/src/base32.js
index af7022c..ece722c 100644
--- a/src/base32.js
+++ b/src/base32.js
@@ -4,12 +4,23 @@
  *  @author   : Gin (gin.lance.inside@hotmail.com)
  */
 
- export class Base32 {
-    static decode() {
-        return "static Base32.decode";
+const  nibbler = require("./nibbler/nibbler");
+
+export class Base32 {
+    /*＊
+     * Base32 decode function
+     *
+     * @param {secret}
+     * @type {String} 
+     * @desc input string
+     *
+     * @return {String}
+     */
+    static decode(secret) {
+        return nibbler.b32decode(secret);
     }
 
     static random_gen() {
         return "static Base32.random_gen";
     }
- }
\ No newline at end of file
+}
\ No newline at end of file
diff --git a/test/b32_test.js b/test/b32_test.js
index c77b097..1f9a4df 100644
--- a/test/b32_test.js
+++ b/test/b32_test.js
@@ -6,8 +6,8 @@ describe('Base32 module test', function() {
     var a = b32.Base32;
     
     describe('static decode() function', function() {
-        it("should print 'static Base32.decode'", function() {
-            assert.equal("static Base32.decode", a.decode());
+        it("should print 'Hello, World!'", function() {
+            assert.equal("Hello, World!", a.decode("JBSWY3DPFQQFO33SNRSCC====="));
         });
     });