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diff --git a/src/DotNetOpenAuth.Core/Messaging/BinaryDataBagFormatter.cs b/src/DotNetOpenAuth.Core/Messaging/BinaryDataBagFormatter.cs
new file mode 100644
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+++ b/src/DotNetOpenAuth.Core/Messaging/BinaryDataBagFormatter.cs
@@ -0,0 +1,80 @@
+//-----------------------------------------------------------------------
+// <copyright file="BinaryDataBagFormatter.cs" company="Andrew Arnott">
+//     Copyright (c) Andrew Arnott. All rights reserved.
+// </copyright>
+//-----------------------------------------------------------------------
+
+namespace DotNetOpenAuth.Messaging {
+	using System;
+	using System.Collections.Generic;
+	using System.Diagnostics.Contracts;
+	using System.IO;
+	using System.Linq;
+	using System.Security.Cryptography;
+	using System.Text;
+	using DotNetOpenAuth.Messaging.Bindings;
+
+	/// <summary>
+	/// A compact binary <see cref="DataBag"/> serialization class.
+	/// </summary>
+	/// <typeparam name="T">The <see cref="DataBag"/>-derived type to serialize/deserialize.</typeparam>
+	internal class BinaryDataBagFormatter<T> : DataBagFormatterBase<T> where T : DataBag, IStreamSerializingDataBag, new() {
+		/// <summary>
+		/// Initializes a new instance of the <see cref="BinaryDataBagFormatter&lt;T&gt;"/> class.
+		/// </summary>
+		/// <param name="signingKey">The crypto service provider with the asymmetric key to use for signing or verifying the token.</param>
+		/// <param name="encryptingKey">The crypto service provider with the asymmetric key to use for encrypting or decrypting the token.</param>
+		/// <param name="compressed">A value indicating whether the data in this instance will be GZip'd.</param>
+		/// <param name="maximumAge">The maximum age of a token that can be decoded; useful only when <paramref name="decodeOnceOnly"/> is <c>true</c>.</param>
+		/// <param name="decodeOnceOnly">The nonce store to use to ensure that this instance is only decoded once.</param>
+		protected internal BinaryDataBagFormatter(RSACryptoServiceProvider signingKey = null, RSACryptoServiceProvider encryptingKey = null, bool compressed = false, TimeSpan? maximumAge = null, INonceStore decodeOnceOnly = null)
+			: base(signingKey, encryptingKey, compressed, maximumAge, decodeOnceOnly) {
+		}
+
+		/// <summary>
+		/// Initializes a new instance of the <see cref="BinaryDataBagFormatter&lt;T&gt;"/> class.
+		/// </summary>
+		/// <param name="cryptoKeyStore">The crypto key store used when signing or encrypting.</param>
+		/// <param name="bucket">The bucket in which symmetric keys are stored for signing/encrypting data.</param>
+		/// <param name="signed">A value indicating whether the data in this instance will be protected against tampering.</param>
+		/// <param name="encrypted">A value indicating whether the data in this instance will be protected against eavesdropping.</param>
+		/// <param name="compressed">A value indicating whether the data in this instance will be GZip'd.</param>
+		/// <param name="minimumAge">The minimum age.</param>
+		/// <param name="maximumAge">The maximum age of a token that can be decoded; useful only when <paramref name="decodeOnceOnly"/> is <c>true</c>.</param>
+		/// <param name="decodeOnceOnly">The nonce store to use to ensure that this instance is only decoded once.</param>
+		protected internal BinaryDataBagFormatter(ICryptoKeyStore cryptoKeyStore = null, string bucket = null, bool signed = false, bool encrypted = false, bool compressed = false, TimeSpan? minimumAge = null, TimeSpan? maximumAge = null, INonceStore decodeOnceOnly = null)
+			: base(cryptoKeyStore, bucket, signed, encrypted, compressed, minimumAge, maximumAge, decodeOnceOnly) {
+			Requires.True((cryptoKeyStore != null && bucket != null) || (!signed && !encrypted), null);
+		}
+
+		/// <summary>
+		/// Serializes the <see cref="DataBag"/> instance to a buffer.
+		/// </summary>
+		/// <param name="message">The message.</param>
+		/// <returns>The buffer containing the serialized data.</returns>
+		protected override byte[] SerializeCore(T message) {
+			using (var stream = new MemoryStream()) {
+				message.Serialize(stream);
+				return stream.ToArray();
+			}
+		}
+
+		/// <summary>
+		/// Deserializes the <see cref="DataBag"/> instance from a buffer.
+		/// </summary>
+		/// <param name="message">The message instance to initialize with data from the buffer.</param>
+		/// <param name="data">The data buffer.</param>
+		protected override void DeserializeCore(T message, byte[] data) {
+			using (var stream = new MemoryStream(data)) {
+				message.Deserialize(stream);
+			}
+
+			// Perform basic validation on message that the MessageSerializer would have normally performed.
+			var messageDescription = MessageDescriptions.Get(message);
+			var dictionary = messageDescription.GetDictionary(message);
+			messageDescription.EnsureMessagePartsPassBasicValidation(dictionary);
+			IMessage m = message;
+			m.EnsureValidMessage();
+		}
+	}
+}