diff --git a/.gitignore b/.gitignore
index 1518643da..d191d4144 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,7 @@
 Config/bin/
 Config/obj/
+Decode/bin/
+Decode/obj/
 DeviceTest/bin/
 DeviceTest/obj/
 Dirichlet.Numerics/bin
diff --git a/Decode/Decode.csproj b/Decode/Decode.csproj
new file mode 100644
index 000000000..cd170fc7b
--- /dev/null
+++ b/Decode/Decode.csproj
@@ -0,0 +1,64 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">x86</Platform>
+    <ProductVersion>8.0.30703</ProductVersion>
+    <SchemaVersion>2.0</SchemaVersion>
+    <ProjectGuid>{D476ABBE-A455-4476-8A8D-3F6151217B51}</ProjectGuid>
+    <OutputType>Exe</OutputType>
+    <AppDesignerFolder>Properties</AppDesignerFolder>
+    <RootNamespace>Decode</RootNamespace>
+    <AssemblyName>Decode</AssemblyName>
+    <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
+    <TargetFrameworkProfile>
+    </TargetFrameworkProfile>
+    <FileAlignment>512</FileAlignment>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|x86' ">
+    <PlatformTarget>x86</PlatformTarget>
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|x86' ">
+    <PlatformTarget>x86</PlatformTarget>
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup>
+    <StartupObject>Decode.Program</StartupObject>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="System" />
+    <Reference Include="System.Core" />
+    <Reference Include="System.Xml.Linq" />
+    <Reference Include="System.Data.DataSetExtensions" />
+    <Reference Include="Microsoft.CSharp" />
+    <Reference Include="System.Data" />
+    <Reference Include="System.Xml" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="Program.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="app.config" />
+  </ItemGroup>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+  <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
+       Other similar extension points exist, see Microsoft.Common.targets.
+  <Target Name="BeforeBuild">
+  </Target>
+  <Target Name="AfterBuild">
+  </Target>
+  -->
+</Project>
\ No newline at end of file
diff --git a/Decode/Decode.csproj.user b/Decode/Decode.csproj.user
new file mode 100644
index 000000000..65b29562a
--- /dev/null
+++ b/Decode/Decode.csproj.user
@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Debug|x86'">
+    <StartArguments>config.xml</StartArguments>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Release|x86'">
+    <StartArguments>config.xml</StartArguments>
+  </PropertyGroup>
+</Project>
\ No newline at end of file
diff --git a/Decode/Program.cs b/Decode/Program.cs
new file mode 100644
index 000000000..49c9e0d04
--- /dev/null
+++ b/Decode/Program.cs
@@ -0,0 +1,107 @@
+using System;
+using System.IO;
+using System.Security.Cryptography;
+
+namespace Decode
+{
+    class Program
+    {
+        static byte[] cryptoKey = new byte[] { 235, 7, 236, 58, 24, 225, 97, 102, 231, 1, 121, 12, 177, 145, 87, 200,
+                                               102, 85, 152, 73, 230, 203, 101, 169, 242, 213, 228, 219, 239, 157, 245, 156 };
+
+        static byte[] cryptoIV = new byte[] { 189, 23, 137, 56, 204, 241, 242, 118, 28, 89, 9, 198, 224, 111, 186, 125 };
+
+        static void Main(string[] args)
+        {
+            if ((args.Length < 1) || !File.Exists(args[0]))
+            {
+                Console.WriteLine("Usage:  Decode <file>");
+                Console.ReadKey();
+                return;
+            }
+
+            string fileName = args[0];
+
+            try
+            {
+                using (StreamReader reader = new StreamReader(fileName))
+                {
+                    if (reader.ReadLine().StartsWith("<?xml version="))
+                    {
+                        Console.WriteLine(string.Format("File {0} was not encrypted.", fileName));
+                        Console.ReadKey();
+                        return;
+                    }
+                }
+
+                bool successful = false;
+                Stream stream = File.OpenRead(fileName);
+                using (BinaryReader binaryReader = new BinaryReader(stream))
+                {
+                    int length = (int)(new FileInfo(fileName).Length);
+
+                    /// Load encrypted binary data into an array
+                    byte[] encrypted = new byte[length];
+                    int bytesRead = binaryReader.Read(encrypted, 0, length);
+                    if (bytesRead != length)
+                    {
+                        Console.WriteLine(string.Format("Failed to read file {0}.", fileName));
+                        Console.ReadKey();
+                        return;
+                    }
+
+                    using (RijndaelManaged myRijndael = new RijndaelManaged())
+                    {
+                        /// Create a decryptor to perform the stream transform.
+                        ICryptoTransform decryptor = myRijndael.CreateDecryptor(cryptoKey, cryptoIV);
+
+                        /// Create the streams used for decryption.
+                        using (MemoryStream msDecrypt = new MemoryStream(encrypted))
+                        {
+                            using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
+                            {
+                                using (StreamReader srDecrypt = new StreamReader(csDecrypt))
+                                {
+                                    using (TextWriter writer = new StreamWriter(fileName + ".plain"))
+                                    {
+                                        writer.Write(srDecrypt.ReadToEnd());
+                                        successful = true;
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+
+                if (successful)
+                {
+                    /// Decoding the file was successfuly completed => rotate files
+                    if (File.Exists(fileName + ".bak")) File.Delete(fileName + ".bak");
+                    File.Move(fileName, fileName + ".bak");
+                    File.Move(fileName + ".plain", fileName);
+                    return;
+                }
+                else
+                {
+                    Failed(fileName);
+                    return;
+                }
+            }
+            catch (Exception)
+            {
+                Failed(fileName);
+                return;
+            }
+        }
+
+        static void Failed(string fileName)
+        {
+            if (File.Exists(fileName + ".plain"))
+            {
+                File.Delete(fileName + ".plain");
+            }
+            Console.WriteLine(string.Format("Decoding file {0} failed.", fileName));
+            Console.ReadKey();
+        }
+    }
+}
diff --git a/Decode/Properties/AssemblyInfo.cs b/Decode/Properties/AssemblyInfo.cs
new file mode 100644
index 000000000..7b1ec09bf
--- /dev/null
+++ b/Decode/Properties/AssemblyInfo.cs
@@ -0,0 +1,36 @@
+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following 
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("Decode")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("Decode")]
+[assembly: AssemblyCopyright("Copyright ©  2019")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Setting ComVisible to false makes the types in this assembly not visible 
+// to COM components.  If you need to access a type in this assembly from 
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible(false)]
+
+// The following GUID is for the ID of the typelib if this project is exposed to COM
+[assembly: Guid("c17ec788-0e12-4f9c-aadf-ea4e83a9f373")]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version 
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers 
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]
diff --git a/Decode/app.config b/Decode/app.config
new file mode 100644
index 000000000..e36560333
--- /dev/null
+++ b/Decode/app.config
@@ -0,0 +1,3 @@
+<?xml version="1.0"?>
+<configuration>
+<startup><supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/></startup></configuration>
diff --git a/TBF.sln b/TBF.sln
index 138a654b2..1bb3a95a7 100644
--- a/TBF.sln
+++ b/TBF.sln
@@ -48,6 +48,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "GemCard", "GemCard\GemCard.
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Statistics", "Statistics\Statistics.csproj", "{36755E1D-6FC3-4D9C-8DD3-0250D51532E0}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Decode", "Decode\Decode.csproj", "{D476ABBE-A455-4476-8A8D-3F6151217B51}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -186,6 +188,16 @@ Global
 		{36755E1D-6FC3-4D9C-8DD3-0250D51532E0}.Release|Mixed Platforms.Build.0 = Release|x86
 		{36755E1D-6FC3-4D9C-8DD3-0250D51532E0}.Release|x86.ActiveCfg = Release|x86
 		{36755E1D-6FC3-4D9C-8DD3-0250D51532E0}.Release|x86.Build.0 = Release|x86
+		{D476ABBE-A455-4476-8A8D-3F6151217B51}.Debug|Any CPU.ActiveCfg = Debug|x86
+		{D476ABBE-A455-4476-8A8D-3F6151217B51}.Debug|Mixed Platforms.ActiveCfg = Debug|x86
+		{D476ABBE-A455-4476-8A8D-3F6151217B51}.Debug|Mixed Platforms.Build.0 = Debug|x86
+		{D476ABBE-A455-4476-8A8D-3F6151217B51}.Debug|x86.ActiveCfg = Debug|x86
+		{D476ABBE-A455-4476-8A8D-3F6151217B51}.Debug|x86.Build.0 = Debug|x86
+		{D476ABBE-A455-4476-8A8D-3F6151217B51}.Release|Any CPU.ActiveCfg = Release|x86
+		{D476ABBE-A455-4476-8A8D-3F6151217B51}.Release|Mixed Platforms.ActiveCfg = Release|x86
+		{D476ABBE-A455-4476-8A8D-3F6151217B51}.Release|Mixed Platforms.Build.0 = Release|x86
+		{D476ABBE-A455-4476-8A8D-3F6151217B51}.Release|x86.ActiveCfg = Release|x86
+		{D476ABBE-A455-4476-8A8D-3F6151217B51}.Release|x86.Build.0 = Release|x86
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
diff --git a/clean.bat b/clean.bat
index 697ba63cf..3a369e50d 100644
--- a/clean.bat
+++ b/clean.bat
@@ -1,5 +1,7 @@
 rmdir /s /q Config\bin
 rmdir /s /q Config\obj
+rmdir /s /q Decode\bin
+rmdir /s /q Decode\obj
 rmdir /s /q DeviceTest\bin
 rmdir /s /q DeviceTest\obj
 rmdir /s /q Dirichlet.Numerics\bin