diff --git a/Contexts/ContextNativeMethods.cs b/Contexts/ContextNativeMethods.cs
index 6ddcf6c..bff36a9 100644
--- a/Contexts/ContextNativeMethods.cs
+++ b/Contexts/ContextNativeMethods.cs
@@ -146,6 +146,16 @@ namespace NSspi.Contexts
         [DllImport( "Secur32.dll", EntryPoint = "FreeContextBuffer", CharSet = CharSet.Unicode )]
         internal static extern SecurityStatus FreeContextBuffer( IntPtr handle );
 
+
+        [ReliabilityContract( Consistency.WillNotCorruptState, Cer.Success )]
+        [DllImport( "Secur32.dll", EntryPoint = "ImpersonateSecurityContext ", CharSet = CharSet.Unicode )]
+        internal static extern SecurityStatus ImpersonateSecurityContext( ref RawSspiHandle contextHandle );
+
+        [ReliabilityContract( Consistency.WillNotCorruptState, Cer.Success )]
+        [DllImport( "Secur32.dll", EntryPoint = "RevertSecurityContext ", CharSet = CharSet.Unicode )]
+        internal static extern SecurityStatus RevertSecurityContext( ref RawSspiHandle contextHandle );
+
+
         internal static SecurityStatus SafeEncryptMessage(
             SafeContextHandle handle,
             int qualityOfProtection,
diff --git a/NSspi.csproj b/NSspi.csproj
index 45db057..10cd6c5 100644
--- a/NSspi.csproj
+++ b/NSspi.csproj
@@ -53,6 +53,7 @@
     <Compile Include="Contexts\ContextNativeMethods.cs" />
     <Compile Include="Contexts\ContextQueries.cs" />
     <Compile Include="Contexts\ContextQueryAttrib.cs" />
+    <Compile Include="Contexts\ImpersonationHandle.cs" />
     <Compile Include="Contexts\SafeContextHandle.cs" />
     <Compile Include="Contexts\ServerContext.cs" />
     <Compile Include="Credentials\ClientCredential.cs" />