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diff --git a/src/DotNetOpenAuth.OAuth/OAuth/Messages/SignedMessageBase.cs b/src/DotNetOpenAuth.OAuth/OAuth/Messages/SignedMessageBase.cs
new file mode 100644
index 0000000..6084fc0
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+++ b/src/DotNetOpenAuth.OAuth/OAuth/Messages/SignedMessageBase.cs
@@ -0,0 +1,197 @@
+//-----------------------------------------------------------------------
+// <copyright file="SignedMessageBase.cs" company="Andrew Arnott">
+//     Copyright (c) Andrew Arnott. All rights reserved.
+// </copyright>
+//-----------------------------------------------------------------------
+
+namespace DotNetOpenAuth.OAuth.Messages {
+	using System;
+	using System.Collections.Generic;
+	using System.Diagnostics.CodeAnalysis;
+	using DotNetOpenAuth.Messaging;
+	using DotNetOpenAuth.Messaging.Bindings;
+	using DotNetOpenAuth.OAuth.ChannelElements;
+
+	/// <summary>
+	/// A base class for all signed OAuth messages.
+	/// </summary>
+	public class SignedMessageBase : MessageBase, ITamperResistantOAuthMessage, IExpiringProtocolMessage, IReplayProtectedProtocolMessage {
+		/// <summary>
+		/// The reference date and time for calculating time stamps.
+		/// </summary>
+		private static readonly DateTime epoch = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
+
+		/// <summary>
+		/// The number of seconds since 1/1/1970, consistent with the OAuth timestamp requirement.
+		/// </summary>
+		[MessagePart("oauth_timestamp", IsRequired = true)]
+		private long timestamp;
+
+		/// <summary>
+		/// Initializes a new instance of the <see cref="SignedMessageBase"/> class.
+		/// </summary>
+		/// <param name="transport">A value indicating whether this message requires a direct or indirect transport.</param>
+		/// <param name="recipient">The URI that a directed message will be delivered to.</param>
+		/// <param name="version">The OAuth version.</param>
+		internal SignedMessageBase(MessageTransport transport, MessageReceivingEndpoint recipient, Version version)
+			: base(MessageProtections.All, transport, recipient, version) {
+			ITamperResistantOAuthMessage self = (ITamperResistantOAuthMessage)this;
+			HttpDeliveryMethods methods = ((IDirectedProtocolMessage)this).HttpMethods;
+			self.HttpMethod = MessagingUtilities.GetHttpVerb(methods);
+		}
+
+		#region ITamperResistantOAuthMessage Members
+
+		/// <summary>
+		/// Gets or sets the signature method used to sign the request.
+		/// </summary>
+		string ITamperResistantOAuthMessage.SignatureMethod {
+			get { return this.SignatureMethod; }
+			set { this.SignatureMethod = value; }
+		}
+
+		/// <summary>
+		/// Gets or sets the Token Secret used to sign the message.
+		/// </summary>
+		string ITamperResistantOAuthMessage.TokenSecret {
+			get { return this.TokenSecret; }
+			set { this.TokenSecret = value; }
+		}
+
+		/// <summary>
+		/// Gets or sets the Consumer key.
+		/// </summary>
+		[MessagePart("oauth_consumer_key", IsRequired = true)]
+		public string ConsumerKey { get; set; }
+
+		/// <summary>
+		/// Gets or sets the Consumer Secret used to sign the message.
+		/// </summary>
+		string ITamperResistantOAuthMessage.ConsumerSecret {
+			get { return this.ConsumerSecret; }
+			set { this.ConsumerSecret = value; }
+		}
+
+		/// <summary>
+		/// Gets or sets the HTTP method that will be used to transmit the message.
+		/// </summary>
+		string ITamperResistantOAuthMessage.HttpMethod {
+			get { return this.HttpMethod; }
+			set { this.HttpMethod = value; }
+		}
+
+		/// <summary>
+		/// Gets or sets the URI to the Service Provider endpoint to send this message to.
+		/// </summary>
+		Uri ITamperResistantOAuthMessage.Recipient {
+			get { return this.Recipient; }
+			set { this.Recipient = value; }
+		}
+
+		#endregion
+
+		#region ITamperResistantProtocolMessage Members
+
+		/// <summary>
+		/// Gets or sets the message signature.
+		/// </summary>
+		string ITamperResistantProtocolMessage.Signature {
+			get { return this.Signature; }
+			set { this.Signature = value; }
+		}
+
+		#endregion
+
+		#region IExpiringProtocolMessage Members
+
+		/// <summary>
+		/// Gets or sets the OAuth timestamp of the message.
+		/// </summary>
+		DateTime IExpiringProtocolMessage.UtcCreationDate {
+			get { return epoch + TimeSpan.FromSeconds(this.timestamp); }
+			set { this.timestamp = (long)(value - epoch).TotalSeconds; }
+		}
+
+		#endregion
+
+		#region IReplayProtectedProtocolMessage Members
+
+		/// <summary>
+		/// Gets the context within which the nonce must be unique.
+		/// </summary>
+		/// <value>The consumer key.</value>
+		string IReplayProtectedProtocolMessage.NonceContext {
+			get { return this.ConsumerKey; }
+		}
+
+		/// <summary>
+		/// Gets or sets the message nonce used for replay detection.
+		/// </summary>
+		[MessagePart("oauth_nonce", IsRequired = true)]
+		string IReplayProtectedProtocolMessage.Nonce { get; set; }
+
+		#endregion
+
+		#region IMessageOriginalPayload Members
+
+		/// <summary>
+		/// Gets or sets the original message parts, before any normalization or default values were assigned.
+		/// </summary>
+		IDictionary<string, string> IMessageOriginalPayload.OriginalPayload {
+			get { return this.OriginalPayload; }
+			set { this.OriginalPayload = value; }
+		}
+
+		/// <summary>
+		/// Gets or sets the original message parts, before any normalization or default values were assigned.
+		/// </summary>
+		[SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly", Justification = "By design")]
+		protected IDictionary<string, string> OriginalPayload { get; set; }
+
+		#endregion
+
+		/// <summary>
+		/// Gets or sets the signature method used to sign the request.
+		/// </summary>
+		[MessagePart("oauth_signature_method", IsRequired = true)]
+		protected string SignatureMethod { get; set; }
+
+		/// <summary>
+		/// Gets or sets the Token Secret used to sign the message.
+		/// </summary>
+		protected string TokenSecret { get; set; }
+
+		/// <summary>
+		/// Gets or sets the Consumer Secret used to sign the message.
+		/// </summary>
+		protected string ConsumerSecret { get; set; }
+
+		/// <summary>
+		/// Gets or sets the HTTP method that will be used to transmit the message.
+		/// </summary>
+		protected string HttpMethod { get; set; }
+
+		/// <summary>
+		/// Gets or sets the message signature.
+		/// </summary>
+		[MessagePart("oauth_signature", IsRequired = true)]
+		protected string Signature { get; set; }
+
+		/// <summary>
+		/// Gets or sets the version of the protocol this message was created with.
+		/// </summary>
+		[SuppressMessage("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode", Justification = "Accessed via reflection.")]
+		[MessagePart("oauth_version", IsRequired = false)]
+		private string OAuthVersion {
+			get {
+				return Protocol.Lookup(Version).PublishedVersion;
+			}
+
+			set {
+				if (value != this.OAuthVersion) {
+					throw new ArgumentOutOfRangeException("value");
+				}
+			}
+		}
+	}
+}