diff --git a/src/Core/Models/Domain/SymmetricCryptoKey.cs b/src/Core/Models/Domain/SymmetricCryptoKey.cs
index 91bce7550..3ed066dd0 100644
--- a/src/Core/Models/Domain/SymmetricCryptoKey.cs
+++ b/src/Core/Models/Domain/SymmetricCryptoKey.cs
@@ -74,4 +74,18 @@ namespace Bit.Core.Models.Domain
         public string EncKeyB64 { get; set; }
         public string MacKeyB64 { get; set; }
     }
+
+    public class UserKey : SymmetricCryptoKey
+    {
+        public UserKey(byte[] key, EncryptionType? encType = null)
+            : base(key, encType)
+        { }
+    }
+
+    public class MasterKey : SymmetricCryptoKey
+    {
+        public MasterKey(byte[] key, EncryptionType? encType = null)
+            : base(key, encType)
+        { }
+    }
 }