diff --git a/websocket-sharp.userprefs b/websocket-sharp.userprefs
index c1a56c579..2268092de 100644
--- a/websocket-sharp.userprefs
+++ b/websocket-sharp.userprefs
@@ -1,8 +1,8 @@
 <Properties>
-  <MonoDevelop.Ide.Workspace ActiveConfiguration="Release" ctype="Workspace" />
+  <MonoDevelop.Ide.Workspace ActiveConfiguration="Debug_Ubuntu" ctype="Workspace" />
   <MonoDevelop.Ide.Workbench ActiveDocument="websocket-sharp/WebSocket.cs" ctype="Workbench">
     <Files>
-      <File FileName="websocket-sharp/WebSocket.cs" Line="261" Column="1" />
+      <File FileName="websocket-sharp/WebSocket.cs" Line="247" Column="31" />
     </Files>
   </MonoDevelop.Ide.Workbench>
   <MonoDevelop.Ide.DebuggingService.Breakpoints>
diff --git a/websocket-sharp/AssemblyInfo.cs b/websocket-sharp/AssemblyInfo.cs
index 89a8f31aa..1dc4f2319 100644
--- a/websocket-sharp/AssemblyInfo.cs
+++ b/websocket-sharp/AssemblyInfo.cs
@@ -17,7 +17,7 @@
 // The form "{Major}.{Minor}.*" will automatically update the build and revision,
 // and "{Major}.{Minor}.{Build}.*" will update just the revision.
 
-[assembly: AssemblyVersion("1.0.0.*")]
+[assembly: AssemblyVersion("0.9.9.*")]
 
 // The following attributes are used to specify the signing key for the assembly, 
 // if desired. See the Mono documentation for more information about signing.
diff --git a/websocket-sharp/Ext.cs b/websocket-sharp/Ext.cs
index 54934a29d..12fc5ee16 100644
--- a/websocket-sharp/Ext.cs
+++ b/websocket-sharp/Ext.cs
@@ -28,7 +28,6 @@
 
 using System;
 using System.Collections.Generic;
-using System.Linq;
 
 namespace WebSocketSharp
 {
@@ -41,58 +40,6 @@ public static bool EqualsWithSaveTo(this int asByte, char c, List<byte> dist)
       return b == Convert.ToByte(c);
     }
 
-    public static uint GenerateKey(this Random rand, int space)
-    {
-      uint max = (uint)(0xffffffff / space);
-
-      int upper16 = (int)((max & 0xffff0000) >> 16);
-      int lower16 = (int)(max & 0x0000ffff);
-
-      return ((uint)rand.Next(upper16 + 1) << 16) + (uint)rand.Next(lower16 + 1);
-    }
-
-    public static char GeneratePrintableASCIIwithoutSPandNum(this Random rand)
-    {
-        int ascii = rand.Next(2) == 0 ? rand.Next(33, 48) : rand.Next(58, 127);
-        return Convert.ToChar(ascii);
-    }
-
-    public static string GenerateSecKey(this Random rand, out uint key)
-    {
-      int space = rand.Next(1, 13);
-      int ascii = rand.Next(1, 13);
-
-      key = rand.GenerateKey(space);
-
-      long mKey = key * space;
-      List<char> secKey = new List<char>(mKey.ToString().ToCharArray());
-
-      int i;
-      ascii.Times( () =>
-      {
-        i = rand.Next(secKey.Count + 1);
-        secKey.Insert(i, rand.GeneratePrintableASCIIwithoutSPandNum());
-      } );
-
-      space.Times( () =>
-      {
-        i = rand.Next(1, secKey.Count);
-        secKey.Insert(i, ' ');
-      } );
-
-      return new String(secKey.ToArray());
-    }
-
-    public static Byte[] InitializeWithPrintableASCII(this Byte[] bytes, Random rand)
-    {
-      for (int i = 0; i < bytes.Length; i++)  
-      {  
-        bytes[i] = (byte)rand.Next(32, 127);
-      }  
-  
-      return bytes;  
-    }
-
     public static void NotEqualsDo(this string expected, string actual, Action<string, string> act)
     {
       if (expected != actual)
@@ -100,13 +47,5 @@ public static void NotEqualsDo(this string expected, string actual, Action<strin
         act(expected, actual);
       }
     }
-
-    public static void Times(this int n, Action act)
-    {
-      for (int i = 0; i < n; i++)
-      {
-        act();
-      }
-    }
   }
 }
diff --git a/websocket-sharp/WebSocket.cs b/websocket-sharp/WebSocket.cs
index 865fd2110..2d4a093b2 100644
--- a/websocket-sharp/WebSocket.cs
+++ b/websocket-sharp/WebSocket.cs
@@ -33,13 +33,11 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
-using System.Linq;
 using System.Net;
 using System.Net.Security;
 using System.Net.Sockets;
 using System.Text;
 using System.Threading;
-using System.Security.Cryptography;
 
 namespace WebSocketSharp
 {
@@ -248,12 +246,7 @@ private void createConnection()
 
     private void doHandshake()
     {
-#if !CHALLENGE
       string request = createOpeningHandshake();
-#else
-      byte[] expectedRes, actualRes = new byte[16];
-      string request = createOpeningHandshake(out expectedRes);
-#endif
 #if DEBUG
       Console.WriteLine("WS: Info @doHandshake: Handshake from client: \n{0}", request);
 #endif
@@ -270,10 +263,6 @@ private void doHandshake()
             wsStream.ReadByte().EqualsWithSaveTo('\r', rawdata) &&
             wsStream.ReadByte().EqualsWithSaveTo('\n', rawdata))
         {
-#if CHALLENGE
-          wsStream.Read(actualRes, 0, actualRes.Length);
-          rawdata.AddRange(actualRes);
-#endif
           break;
         }
       }
@@ -292,21 +281,14 @@ private void doHandshake()
       { 
         throw new IOException("Invalid handshake response: " + a);
       };
-#if !CHALLENGE
+
       "HTTP/1.1 101 Web Socket Protocol Handshake".NotEqualsDo(response[0], act);
-#else
-      "HTTP/1.1 101 WebSocket Protocol Handshake".NotEqualsDo(response[0], act);
-#endif
       "Upgrade: WebSocket".NotEqualsDo(response[1], act);
       "Connection: Upgrade".NotEqualsDo(response[2], act);
 
       for (int i = 3; i < response.Length; i++)
       {
-#if !CHALLENGE
         if (response[i].Contains("WebSocket-Protocol:"))
-#else
-        if (response[i].Contains("Sec-WebSocket-Protocol:"))
-#endif
         {
           int j = response[i].IndexOf(":");
           protocol = response[i].Substring(j + 1).Trim();
@@ -315,29 +297,11 @@ private void doHandshake()
       }
 #if DEBUG
       Console.WriteLine("WS: Info @doHandshake: Sub protocol: {0}", protocol);
-#endif
-#if CHALLENGE
-      string expectedResToHexStr = BitConverter.ToString(expectedRes);
-      string actualResToHexStr = BitConverter.ToString(actualRes);
-
-      expectedResToHexStr.NotEqualsDo(actualResToHexStr, (e, a) =>
-      {
-  #if DEBUG
-        Console.WriteLine("WS: Error @doHandshake: Invalid challenge response.");
-        Console.WriteLine("\texpected: {0}", e);
-        Console.WriteLine("\tactual  : {0}", a);
-  #endif
-        throw new IOException("Invalid challenge response: " + a);
-      });
 #endif
       ReadyState = WsState.OPEN;
     }
 
-#if !CHALLENGE
     private string createOpeningHandshake()
-#else
-    private string createOpeningHandshake(out byte[] expectedRes)
-#endif
     {
       string path = uri.PathAndQuery;
       string host = uri.DnsSafeHost;
@@ -350,55 +314,16 @@ private string createOpeningHandshake(out byte[] expectedRes)
       }
 
       string subProtocol = protocol != String.Empty
-#if !CHALLENGE
                            ? String.Format("WebSocket-Protocol: {0}\r\n", protocol)
-#else
-                           ? String.Format("Sec-WebSocket-Protocol: {0}\r\n", protocol)
-#endif
                            : protocol;
-#if !CHALLENGE
-      string secKeys = String.Empty;
-      string key3ToAscii = String.Empty;
-#else
-      Random rand = new Random();
-
-      uint key1, key2;
-      string secKey1 = rand.GenerateSecKey(out key1);
-      string secKey2 = rand.GenerateSecKey(out key2);
 
-      byte[] key3 = new byte[8].InitializeWithPrintableASCII(rand);
-
-      string secKeys = "Sec-WebSocket-Key1: {0}\r\n" +
-                       "Sec-WebSocket-Key2: {1}\r\n";
-      secKeys = String.Format(secKeys, secKey1, secKey2);
-
-      string key3ToAscii = Encoding.ASCII.GetString(key3);
-
-      expectedRes = createExpectedRes(key1, key2, key3);
-#endif
       return "GET " + path + " HTTP/1.1\r\n" +
              "Upgrade: WebSocket\r\n" +
              "Connection: Upgrade\r\n" +
              subProtocol +
              "Host: " + host + "\r\n" +
              "Origin: " + origin + "\r\n" +
-             secKeys +
-             "\r\n" +
-             key3ToAscii;
-    }
-
-    private byte[] createExpectedRes(uint key1, uint key2, byte[] key3)
-    {
-      byte[] key1Bytes = BitConverter.GetBytes(key1);
-      byte[] key2Bytes = BitConverter.GetBytes(key2);
-
-      Array.Reverse(key1Bytes);
-      Array.Reverse(key2Bytes);
-
-      byte[] concatKeys = key1Bytes.Concat(key2Bytes).Concat(key3).ToArray();
-
-      MD5 md5 = MD5.Create();
-      return md5.ComputeHash(concatKeys);
+             "\r\n";
     }
 
     private void message()
diff --git a/websocket-sharp/bin/Debug/websocket-sharp.dll b/websocket-sharp/bin/Debug/websocket-sharp.dll
index b33f3d669..03e626ccc 100755
Binary files a/websocket-sharp/bin/Debug/websocket-sharp.dll and b/websocket-sharp/bin/Debug/websocket-sharp.dll differ
diff --git a/websocket-sharp/bin/Debug/websocket-sharp.dll.mdb b/websocket-sharp/bin/Debug/websocket-sharp.dll.mdb
index 84b9cea6b..e2e33d9d7 100644
Binary files a/websocket-sharp/bin/Debug/websocket-sharp.dll.mdb and b/websocket-sharp/bin/Debug/websocket-sharp.dll.mdb differ
diff --git a/websocket-sharp/bin/Debug_Ubuntu/websocket-sharp.dll b/websocket-sharp/bin/Debug_Ubuntu/websocket-sharp.dll
index 80b261860..bc1e76e86 100755
Binary files a/websocket-sharp/bin/Debug_Ubuntu/websocket-sharp.dll and b/websocket-sharp/bin/Debug_Ubuntu/websocket-sharp.dll differ
diff --git a/websocket-sharp/bin/Debug_Ubuntu/websocket-sharp.dll.mdb b/websocket-sharp/bin/Debug_Ubuntu/websocket-sharp.dll.mdb
index 03f71e023..00df25d51 100644
Binary files a/websocket-sharp/bin/Debug_Ubuntu/websocket-sharp.dll.mdb and b/websocket-sharp/bin/Debug_Ubuntu/websocket-sharp.dll.mdb differ
diff --git a/websocket-sharp/bin/Release/websocket-sharp.dll b/websocket-sharp/bin/Release/websocket-sharp.dll
index 82caef18a..14a15a073 100755
Binary files a/websocket-sharp/bin/Release/websocket-sharp.dll and b/websocket-sharp/bin/Release/websocket-sharp.dll differ
diff --git a/websocket-sharp/bin/Release_Ubuntu/websocket-sharp.dll b/websocket-sharp/bin/Release_Ubuntu/websocket-sharp.dll
index 2a3946e01..48eac99d8 100755
Binary files a/websocket-sharp/bin/Release_Ubuntu/websocket-sharp.dll and b/websocket-sharp/bin/Release_Ubuntu/websocket-sharp.dll differ
diff --git a/websocket-sharp/websocket-sharp.csproj b/websocket-sharp/websocket-sharp.csproj
index 4f902fb89..8d32d7f1c 100644
--- a/websocket-sharp/websocket-sharp.csproj
+++ b/websocket-sharp/websocket-sharp.csproj
@@ -18,7 +18,7 @@
     <DebugType>full</DebugType>
     <Optimize>false</Optimize>
     <OutputPath>bin\Debug</OutputPath>
-    <DefineConstants>DEBUG,CHALLENGE</DefineConstants>
+    <DefineConstants>DEBUG</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
     <ConsolePause>false</ConsolePause>
@@ -36,7 +36,7 @@
     <DebugType>full</DebugType>
     <Optimize>false</Optimize>
     <OutputPath>bin\Debug_Ubuntu</OutputPath>
-    <DefineConstants>DEBUG,CHALLENGE</DefineConstants>
+    <DefineConstants>DEBUG</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
     <ConsolePause>false</ConsolePause>
diff --git a/websocket-sharp/websocket-sharp.pidb b/websocket-sharp/websocket-sharp.pidb
index f91107613..dfb942f00 100644
Binary files a/websocket-sharp/websocket-sharp.pidb and b/websocket-sharp/websocket-sharp.pidb differ
diff --git a/wsclient/bin/Debug/websocket-sharp.dll b/wsclient/bin/Debug/websocket-sharp.dll
index b33f3d669..03e626ccc 100755
Binary files a/wsclient/bin/Debug/websocket-sharp.dll and b/wsclient/bin/Debug/websocket-sharp.dll differ
diff --git a/wsclient/bin/Debug/websocket-sharp.dll.mdb b/wsclient/bin/Debug/websocket-sharp.dll.mdb
index 84b9cea6b..e2e33d9d7 100644
Binary files a/wsclient/bin/Debug/websocket-sharp.dll.mdb and b/wsclient/bin/Debug/websocket-sharp.dll.mdb differ
diff --git a/wsclient/bin/Debug/wsclient.exe b/wsclient/bin/Debug/wsclient.exe
index 8f3d39f1b..3d06a0708 100755
Binary files a/wsclient/bin/Debug/wsclient.exe and b/wsclient/bin/Debug/wsclient.exe differ
diff --git a/wsclient/bin/Debug/wsclient.exe.mdb b/wsclient/bin/Debug/wsclient.exe.mdb
index b7038045a..8a9f82380 100644
Binary files a/wsclient/bin/Debug/wsclient.exe.mdb and b/wsclient/bin/Debug/wsclient.exe.mdb differ
diff --git a/wsclient/bin/Debug_Ubuntu/websocket-sharp.dll b/wsclient/bin/Debug_Ubuntu/websocket-sharp.dll
index 80b261860..bc1e76e86 100755
Binary files a/wsclient/bin/Debug_Ubuntu/websocket-sharp.dll and b/wsclient/bin/Debug_Ubuntu/websocket-sharp.dll differ
diff --git a/wsclient/bin/Debug_Ubuntu/websocket-sharp.dll.mdb b/wsclient/bin/Debug_Ubuntu/websocket-sharp.dll.mdb
index 03f71e023..00df25d51 100644
Binary files a/wsclient/bin/Debug_Ubuntu/websocket-sharp.dll.mdb and b/wsclient/bin/Debug_Ubuntu/websocket-sharp.dll.mdb differ
diff --git a/wsclient/bin/Debug_Ubuntu/wsclient.exe b/wsclient/bin/Debug_Ubuntu/wsclient.exe
index 246a33c44..02f1c2396 100755
Binary files a/wsclient/bin/Debug_Ubuntu/wsclient.exe and b/wsclient/bin/Debug_Ubuntu/wsclient.exe differ
diff --git a/wsclient/bin/Debug_Ubuntu/wsclient.exe.mdb b/wsclient/bin/Debug_Ubuntu/wsclient.exe.mdb
index d3cb2c6ae..2b75a9c4d 100644
Binary files a/wsclient/bin/Debug_Ubuntu/wsclient.exe.mdb and b/wsclient/bin/Debug_Ubuntu/wsclient.exe.mdb differ
diff --git a/wsclient/bin/Release/websocket-sharp.dll b/wsclient/bin/Release/websocket-sharp.dll
index 82caef18a..14a15a073 100755
Binary files a/wsclient/bin/Release/websocket-sharp.dll and b/wsclient/bin/Release/websocket-sharp.dll differ
diff --git a/wsclient/bin/Release/wsclient.exe b/wsclient/bin/Release/wsclient.exe
index 432e7468f..68ddcb051 100755
Binary files a/wsclient/bin/Release/wsclient.exe and b/wsclient/bin/Release/wsclient.exe differ
diff --git a/wsclient/bin/Release_Ubuntu/websocket-sharp.dll b/wsclient/bin/Release_Ubuntu/websocket-sharp.dll
index 2a3946e01..48eac99d8 100755
Binary files a/wsclient/bin/Release_Ubuntu/websocket-sharp.dll and b/wsclient/bin/Release_Ubuntu/websocket-sharp.dll differ
diff --git a/wsclient/bin/Release_Ubuntu/wsclient.exe b/wsclient/bin/Release_Ubuntu/wsclient.exe
index 92ea1e263..5954d73a7 100755
Binary files a/wsclient/bin/Release_Ubuntu/wsclient.exe and b/wsclient/bin/Release_Ubuntu/wsclient.exe differ
diff --git a/wsclient/wsclient.pidb b/wsclient/wsclient.pidb
index 214097e10..00f775c51 100644
Binary files a/wsclient/wsclient.pidb and b/wsclient/wsclient.pidb differ