diff --git a/src/SAML2.Core/Config/IdentityProvider.cs b/src/SAML2.Core/Config/IdentityProvider.cs
index f1b7e05..477bbe6 100644
--- a/src/SAML2.Core/Config/IdentityProvider.cs
+++ b/src/SAML2.Core/Config/IdentityProvider.cs
@@ -73,7 +73,6 @@ public class IdentityProvider
         /// <value>The response encoding.</value>
         public string ResponseEncoding { get; set; }
 
-
         /// <summary>
         /// Gets or sets the artifact resolution.
         /// </summary>
diff --git a/src/SAML2.Core/Config/Saml2Configuration.cs b/src/SAML2.Core/Config/Saml2Configuration.cs
index 36b359e..35d362d 100644
--- a/src/SAML2.Core/Config/Saml2Configuration.cs
+++ b/src/SAML2.Core/Config/Saml2Configuration.cs
@@ -53,6 +53,15 @@ public class Saml2Configuration
         /// <value>The service provider.</value>
         public ServiceProvider ServiceProvider { get; set; }
 
+        /// <summary>
+        /// Gets or sets a value weather the response SAML message from IdP should be decompressed after it's BAse64 endoded.
+        /// Compression is used by some IdP providers for example PingFederate.
+        /// This perform these decode steps: https://www.samltool.com/decode.php (see Base64 Decode + Inflate page)
+        /// Default: false
+        /// </summary>
+        /// <value>The response encoding.</value>
+        public bool InflateResponseMessage { get; set; }
+
         public Saml2Configuration()
         {
             IdentityProviders = new IdentityProviders();
diff --git a/src/SAML2.Core/Protocol/Utility.cs b/src/SAML2.Core/Protocol/Utility.cs
index f863c46..ff1b7ac 100644
--- a/src/SAML2.Core/Protocol/Utility.cs
+++ b/src/SAML2.Core/Protocol/Utility.cs
@@ -9,6 +9,7 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
+using System.IO.Compression;
 using System.Linq;
 using System.Security.Cryptography;
 using System.Security.Cryptography.X509Certificates;
@@ -153,14 +154,34 @@ public static void PreHandleAssertion(XmlElement elem, IdentityProvider endpoint
         /// </summary>
         /// <param name="samlResponse">This is base64 encoded SAML Response (usually SAMLResponse on query string)</param>
         /// <param name="encoding">The encoding.</param>
+        /// <param name="infateResponse">Wheater the response message should be inflated (decompressed).</param>
         /// <returns>The decoded SAML response XML.</returns>
-        public static XmlDocument GetDecodedSamlResponse(string samlResponse, Encoding encoding)
+        public static XmlDocument GetDecodedSamlResponse(string samlResponse, Encoding encoding, bool infateResponse)
         {
             logger.Debug(TraceMessages.SamlResponseDecoding);
 
+            var samlResponseBytes = Convert.FromBase64String(samlResponse);
+            if (infateResponse)
+            {
+                logger.Debug(TraceMessages.SamlResponseDecodingDeflating);
+
+                // The response message is compressed using the Deflate algorith. Need to decompress it first.
+                using (var decompressedStream = new MemoryStream())
+                {
+                    using (var compressedStream = new MemoryStream(samlResponseBytes))
+                    using (var decompressor = new DeflateStream(compressedStream, CompressionMode.Decompress))
+                    {
+                        decompressor.CopyTo(decompressedStream);
+                    }
+                    samlResponseBytes = decompressedStream.ToArray();
+                }
+
+                logger.Debug(TraceMessages.SamlResponseDecodingDeflated);
+            }
+
+            samlResponse = encoding.GetString(samlResponseBytes);
 
             var doc = new XmlDocument { PreserveWhitespace = true };
-            samlResponse = encoding.GetString(Convert.FromBase64String(samlResponse));
             doc.LoadXml(samlResponse);
 
             logger.DebugFormat(TraceMessages.SamlResponseDecoded, samlResponse);
@@ -381,7 +402,7 @@ public static void HandleSoap(HttpArtifactBindingBuilder builder, Stream inputSt
         public static Saml20Assertion HandleResponse(Saml2Configuration config, string samlResponse, IDictionary<string, object> session, Func<string, object> getFromCache, Action<string, object, DateTime> setInCache)
         {
             var defaultEncoding = Encoding.UTF8;
-            var doc = Utility.GetDecodedSamlResponse(samlResponse, defaultEncoding);
+            var doc = Utility.GetDecodedSamlResponse(samlResponse, defaultEncoding, config.InflateResponseMessage);
             logger.DebugFormat(TraceMessages.SamlResponseReceived, doc.OuterXml);
 
             // Determine whether the assertion should be decrypted before being validated.
@@ -419,7 +440,7 @@ public static Saml20Assertion HandleResponse(Saml2Configuration config, string s
                 }
 
                 if (encodingOverride.CodePage != defaultEncoding.CodePage) {
-                    var doc1 = GetDecodedSamlResponse(samlResponse, encodingOverride);
+                    var doc1 = GetDecodedSamlResponse(samlResponse, encodingOverride, config.InflateResponseMessage);
                     assertion = GetAssertion(doc1.DocumentElement, out isEncrypted);
                 }
             }
diff --git a/src/SAML2.Core/Resources.Designer.cs b/src/SAML2.Core/Resources.Designer.cs
index 0ad53b4..19ec3d2 100644
--- a/src/SAML2.Core/Resources.Designer.cs
+++ b/src/SAML2.Core/Resources.Designer.cs
@@ -1,7 +1,7 @@
 //------------------------------------------------------------------------------
 // <auto-generated>
 //     This code was generated by a tool.
-//     Runtime Version:4.0.30319.0
+//     Runtime Version:4.0.30319.42000
 //
 //     Changes to this file may cause incorrect behavior and will be lost if
 //     the code is regenerated.
diff --git a/src/SAML2.Core/TraceMessages.resx b/src/SAML2.Core/TraceMessages.resx
index 1f40883..bb1794b 100644
--- a/src/SAML2.Core/TraceMessages.resx
+++ b/src/SAML2.Core/TraceMessages.resx
@@ -112,10 +112,10 @@
     <value>2.0</value>
   </resheader>
   <resheader name="reader">
-    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
   </resheader>
   <resheader name="writer">
-    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
   </resheader>
   <data name="ArtifactCreated" xml:space="preserve">
     <value>Artifact created: {0}</value>
@@ -273,4 +273,10 @@
   <data name="SignOnHandlerCalled" xml:space="preserve">
     <value>SignOn handler called</value>
   </data>
+  <data name="SamlResponseDecodingDeflating" xml:space="preserve">
+    <value>Deflating the response SAML message</value>
+  </data>
+  <data name="SamlResponseDecodingDeflated" xml:space="preserve">
+    <value>The response SAML message was deflated</value>
+  </data>
 </root>
\ No newline at end of file
diff --git a/src/SAML2.sln b/src/SAML2.sln
index 72ae66d..a71bf44 100644
--- a/src/SAML2.sln
+++ b/src/SAML2.sln
@@ -1,7 +1,7 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio 14
-VisualStudioVersion = 14.0.22310.1
+# Visual Studio 2013
+VisualStudioVersion = 12.0.31101.0
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SAML2.Core", "SAML2.Core\SAML2.Core.csproj", "{75E5BAD2-A20C-43CC-B5C8-38004CEDBDFD}"
 EndProject