diff --git a/Noise/KeyPair.cs b/Noise/KeyPair.cs
index 8e20d41..2128412 100644
--- a/Noise/KeyPair.cs
+++ b/Noise/KeyPair.cs
@@ -5,7 +5,7 @@ namespace Noise
 	/// <summary>
 	/// A Diffie-Hellman private/public key pair.
 	/// </summary>
-	public sealed class KeyPair : IDisposable
+	internal sealed class KeyPair : IDisposable
 	{
 		private readonly byte[] privateKey;
 		private readonly byte[] publicKey;