diff --git a/6rnd.h b/6rnd.h
new file mode 100644
index 0000000..1bec33e
--- /dev/null
+++ b/6rnd.h
@@ -0,0 +1,32 @@
+#pragma once
+#include "des.h"
+#include "hack.h"
+using namespace std;
+
+int main() {
+    ull inA = 0, inB = 0, outA = 0, outB = 0;
+    ull inC = 0, inD = 0, outC = 0, outD = 0;
+    ull key = 0xF0F0F0F0F0F0F0F0;
+    /* ull key = 0xF1F2F3F4F5F6F7F8; */
+
+    DesHacker hacker;
+    for (int i = 0; i < 2; i++) {
+        constructCipherPlaintexts(key, 1, inA, inB, outA, outB); // 随机生成满足第一种差分特征的两个明密文对
+        hacker.addCipherPlaintexts(inA, inB, outA, outB); // 将构造好的明密文对传入DesHacker中
+    }
+    for (int i = 0; i < 2; i++) {
+        constructCipherPlaintexts(key, 2, inC, inD, outC, outD); // 随机生成满足第二种差分特征的两个明密文对
+        hacker.addCipherPlaintexts(inC, inD, outC, outD);
+    }
+
+    if (hacker.hack()) { // 差分分析
+        ull result_key = hacker.getKey();
+        printf("Success\n");
+        print_long_hex(result_key);
+    }
+    else {
+        printf("Failed...\n");
+    }
+
+    return 0;
+}
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