diff --git a/AssignedRoles.cs b/AssignedRoles.cs
index e5e3d15..9476c86 100644
--- a/AssignedRoles.cs
+++ b/AssignedRoles.cs
@@ -26,6 +26,24 @@ namespace ln.identities
                 return assignedRoles[identity.UniqueID];
             }
         }
+        public AssignedRole this[Guid identityUniqueID]
+        {
+            get
+            {
+                if (!assignedRoles.ContainsKey(identityUniqueID))
+                {
+                    if (identityUniqueID.Equals(Guid.Empty))
+                        assignedRoles.Add(identityUniqueID, new AssignedRole(identityProvider, Identity.Anonymous(identityProvider)));
+                    else
+                        throw new KeyNotFoundException();
+                }
+                return assignedRoles[identityUniqueID];
+            }
+        }
+
+        public bool HasRole(Role role) => HasRole(null, role);
+        public bool HasRole(Identity identity, Role role) => HasRole(identity?.UniqueID ?? Guid.Empty, role);
+        public bool HasRole(Guid identityUniqueID, Role role)=> (this[identityUniqueID].Role & role) == role;
 
         public IEnumerator<AssignedRole> GetEnumerator()
         {
diff --git a/AuthenticationNeeded.cs b/AuthenticationNeeded.cs
new file mode 100644
index 0000000..632b2aa
--- /dev/null
+++ b/AuthenticationNeeded.cs
@@ -0,0 +1,10 @@
+using System;
+namespace ln.identities
+{
+    public class AuthenticationNeeded : Exception
+    {
+        public AuthenticationNeeded()
+        {
+        }
+    }
+}
diff --git a/Identity.cs b/Identity.cs
index b46b4ad..5587bb8 100644
--- a/Identity.cs
+++ b/Identity.cs
@@ -6,6 +6,8 @@ namespace ln.identities
 {
     public class Identity
     {
+        public static Identity Anonymous(IIdentityProvider identityProvider) => new Identity(identityProvider, Guid.Empty, null);
+
         private IIdentityProvider identityProvider;
         public IIdentityProvider IdentityProvider => identityProvider;
 
diff --git a/RequireAttribute.cs b/RequireAttribute.cs
new file mode 100644
index 0000000..dd13a85
--- /dev/null
+++ b/RequireAttribute.cs
@@ -0,0 +1,30 @@
+using System;
+namespace ln.identities
+{
+    public class RequireAttribute : Attribute
+    {
+        public String IdentityName { get; set; } = null;
+        public Guid IdentityUniqueID { get; set; } = Guid.Empty;
+
+        public Role Role { get; set; }
+
+        public RequireAttribute()
+        {
+        }
+
+        public RequireAttribute(String IdentityName)
+        {
+            this.IdentityName = IdentityName;
+        }
+        public RequireAttribute(Role Role)
+        {
+            this.Role = Role;
+        }
+        public RequireAttribute(String IdentityName,Role Role)
+        {
+            this.IdentityName = IdentityName;
+            this.Role = Role;
+        }
+
+    }
+}
diff --git a/ln.identities.csproj b/ln.identities.csproj
index 6edeae5..ecfc8bc 100644
--- a/ln.identities.csproj
+++ b/ln.identities.csproj
@@ -48,6 +48,8 @@
     <Compile Include="test\IdentityTests.cs" />
     <Compile Include="AssignedRole.cs" />
     <Compile Include="AssignedRoles.cs" />
+    <Compile Include="RequireAttribute.cs" />
+    <Compile Include="AuthenticationNeeded.cs" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\ln.types\ln.types.csproj">