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diff --git a/src/DotNetOpenAuth.OAuth/Messaging/ITamperProtectionChannelBindingElement.cs b/src/DotNetOpenAuth.OAuth/Messaging/ITamperProtectionChannelBindingElement.cs
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+++ b/src/DotNetOpenAuth.OAuth/Messaging/ITamperProtectionChannelBindingElement.cs
@@ -0,0 +1,124 @@
+//-----------------------------------------------------------------------
+// <copyright file="ITamperProtectionChannelBindingElement.cs" company="Andrew Arnott">
+//     Copyright (c) Andrew Arnott. All rights reserved.
+// </copyright>
+//-----------------------------------------------------------------------
+
+namespace DotNetOpenAuth.Messaging {
+	using System;
+	using System.Diagnostics.Contracts;
+	using DotNetOpenAuth.OAuth.ChannelElements;
+
+	/// <summary>
+	/// An interface that must be implemented by message transforms/validators in order
+	/// to be included in the channel stack.
+	/// </summary>
+	[ContractClass(typeof(ITamperProtectionChannelBindingElementContract))]
+	public interface ITamperProtectionChannelBindingElement : IChannelBindingElement {
+		/// <summary>
+		/// Gets or sets the delegate that will initialize the non-serialized properties necessary on a
+		/// signable message so that its signature can be correctly calculated or verified.
+		/// </summary>
+		Action<ITamperResistantOAuthMessage> SignatureCallback { get; set; }
+
+		/// <summary>
+		/// Clones this instance.
+		/// </summary>
+		/// <returns>The cloned instance.</returns>
+		ITamperProtectionChannelBindingElement Clone();
+	}
+
+	/// <summary>
+	/// Contract class for the <see cref="ITamperProtectionChannelBindingElement"/> interface.
+	/// </summary>
+	[ContractClassFor(typeof(ITamperProtectionChannelBindingElement))]
+	internal abstract class ITamperProtectionChannelBindingElementContract : ITamperProtectionChannelBindingElement {
+		#region ITamperProtectionChannelBindingElement Properties
+
+		/// <summary>
+		/// Gets or sets the delegate that will initialize the non-serialized properties necessary on a
+		/// signable message so that its signature can be correctly calculated or verified.
+		/// </summary>
+		Action<ITamperResistantOAuthMessage> ITamperProtectionChannelBindingElement.SignatureCallback {
+			get { throw new NotImplementedException(); }
+			set { throw new NotImplementedException(); }
+		}
+
+		#endregion
+
+		#region IChannelBindingElement Members
+
+		/// <summary>
+		/// Gets or sets the channel that this binding element belongs to.
+		/// </summary>
+		/// <remarks>
+		/// This property is set by the channel when it is first constructed.
+		/// </remarks>
+		Channel IChannelBindingElement.Channel {
+			get { throw new NotImplementedException(); }
+			set { throw new NotImplementedException(); }
+		}
+
+		/// <summary>
+		/// Gets the protection commonly offered (if any) by this binding element.
+		/// </summary>
+		/// <remarks>
+		/// This value is used to assist in sorting binding elements in the channel stack.
+		/// </remarks>
+		MessageProtections IChannelBindingElement.Protection {
+			get { throw new NotImplementedException(); }
+		}
+
+		/// <summary>
+		/// Prepares a message for sending based on the rules of this channel binding element.
+		/// </summary>
+		/// <param name="message">The message to prepare for sending.</param>
+		/// <returns>
+		/// The protections (if any) that this binding element applied to the message.
+		/// Null if this binding element did not even apply to this binding element.
+		/// </returns>
+		/// <remarks>
+		/// Implementations that provide message protection must honor the
+		/// <see cref="MessagePartAttribute.RequiredProtection"/> properties where applicable.
+		/// </remarks>
+		MessageProtections? IChannelBindingElement.ProcessOutgoingMessage(IProtocolMessage message) {
+			throw new NotImplementedException();
+		}
+
+		/// <summary>
+		/// Performs any transformation on an incoming message that may be necessary and/or
+		/// validates an incoming message based on the rules of this channel binding element.
+		/// </summary>
+		/// <param name="message">The incoming message to process.</param>
+		/// <returns>
+		/// The protections (if any) that this binding element applied to the message.
+		/// Null if this binding element did not even apply to this binding element.
+		/// </returns>
+		/// <exception cref="ProtocolException">
+		/// Thrown when the binding element rules indicate that this message is invalid and should
+		/// NOT be processed.
+		/// </exception>
+		/// <remarks>
+		/// Implementations that provide message protection must honor the
+		/// <see cref="MessagePartAttribute.RequiredProtection"/> properties where applicable.
+		/// </remarks>
+		MessageProtections? IChannelBindingElement.ProcessIncomingMessage(IProtocolMessage message) {
+			throw new NotImplementedException();
+		}
+
+		#endregion
+
+		#region ITamperProtectionChannelBindingElement Methods
+
+		/// <summary>
+		/// Clones this instance.
+		/// </summary>
+		/// <returns>The cloned instance.</returns>
+		ITamperProtectionChannelBindingElement ITamperProtectionChannelBindingElement.Clone() {
+			Contract.Ensures(Contract.Result<ITamperProtectionChannelBindingElement>() != null);
+			throw new NotImplementedException();
+		}
+
+		#endregion
+	}
+}