diff --git a/src/Shared/SecurityHelper/SecurityHelper.cs b/src/Shared/SecurityHelper/SecurityHelper.cs
deleted file mode 100644
index 408ef6b224..0000000000
--- a/src/Shared/SecurityHelper/SecurityHelper.cs
+++ /dev/null
@@ -1,40 +0,0 @@
-// Copyright (c) .NET Foundation. All rights reserved.
-// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
-
-using System;
-using System.Linq;
-using System.Security.Claims;
-
-namespace Microsoft.Extensions.Internal
-{
-    /// <summary>
-    /// Helper code used when implementing authentication middleware
-    /// </summary>
-    internal static class SecurityHelper
-    {
-        /// <summary>
-        /// Add all ClaimsIdentities from an additional ClaimPrincipal to the ClaimsPrincipal
-        /// Merges a new claims principal, placing all new identities first, and eliminating
-        /// any empty unauthenticated identities from context.User
-        /// </summary>
-        /// <param name="existingPrincipal">The <see cref="ClaimsPrincipal"/> containing existing <see cref="ClaimsIdentity"/>.</param>
-        /// <param name="additionalPrincipal">The <see cref="ClaimsPrincipal"/> containing <see cref="ClaimsIdentity"/> to be added.</param>
-        public static ClaimsPrincipal MergeUserPrincipal(ClaimsPrincipal existingPrincipal, ClaimsPrincipal additionalPrincipal)
-        {
-            var newPrincipal = new ClaimsPrincipal();
-
-            // New principal identities go first
-            if (additionalPrincipal != null)
-            {
-                newPrincipal.AddIdentities(additionalPrincipal.Identities);
-            }
-
-            // Then add any existing non empty or authenticated identities
-            if (existingPrincipal != null)
-            {
-                newPrincipal.AddIdentities(existingPrincipal.Identities.Where(i => i.IsAuthenticated || i.Claims.Any()));
-            }
-            return newPrincipal;
-        }
-    }
-}
diff --git a/src/Shared/test/Shared.Tests/SecurityHelperTests.cs b/src/Shared/test/Shared.Tests/SecurityHelperTests.cs
deleted file mode 100644
index 8e7515ad36..0000000000
--- a/src/Shared/test/Shared.Tests/SecurityHelperTests.cs
+++ /dev/null
@@ -1,93 +0,0 @@
-// Copyright (c) .NET Foundation. All rights reserved.
-// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
-
-using System.Linq;
-using System.Security.Claims;
-using System.Security.Principal;
-using Xunit;
-
-namespace Microsoft.Extensions.Internal
-{
-    public class SecurityHelperTests
-    {
-        [Fact]
-        public void AddingToAnonymousIdentityDoesNotKeepAnonymousIdentity()
-        {
-            var user = SecurityHelper.MergeUserPrincipal(new ClaimsPrincipal(), new GenericPrincipal(new GenericIdentity("Test1", "Alpha"), new string[0]));
-
-            Assert.NotNull(user);
-            Assert.Equal("Alpha", user.Identity.AuthenticationType);
-            Assert.Equal("Test1", user.Identity.Name);
-            Assert.IsAssignableFrom<ClaimsPrincipal>(user);
-            Assert.IsAssignableFrom<ClaimsIdentity>(user.Identity);
-            Assert.Single(user.Identities);
-        }
-
-        [Fact]
-        public void AddingExistingIdentityChangesDefaultButPreservesPrior()
-        {
-            ClaimsPrincipal user = new GenericPrincipal(new GenericIdentity("Test1", "Alpha"), null);
-
-            Assert.Equal("Alpha", user.Identity.AuthenticationType);
-            Assert.Equal("Test1", user.Identity.Name);
-
-            user = SecurityHelper.MergeUserPrincipal(user, new GenericPrincipal(new GenericIdentity("Test2", "Beta"), new string[0]));
-
-            Assert.Equal("Beta", user.Identity.AuthenticationType);
-            Assert.Equal("Test2", user.Identity.Name);
-
-            user = SecurityHelper.MergeUserPrincipal(user, new GenericPrincipal(new GenericIdentity("Test3", "Gamma"), new string[0]));
-
-            Assert.Equal("Gamma", user.Identity.AuthenticationType);
-            Assert.Equal("Test3", user.Identity.Name);
-
-            Assert.Equal(3, user.Identities.Count());
-            Assert.Equal("Test3", user.Identities.Skip(0).First().Name);
-            Assert.Equal("Test2", user.Identities.Skip(1).First().Name);
-            Assert.Equal("Test1", user.Identities.Skip(2).First().Name);
-        }
-
-        [Fact]
-        public void AddingPreservesNewIdentitiesAndDropsEmpty()
-        {
-            var existingPrincipal = new ClaimsPrincipal(new ClaimsIdentity());
-            var identityNoAuthTypeWithClaim = new ClaimsIdentity();
-            identityNoAuthTypeWithClaim.AddClaim(new Claim("identityNoAuthTypeWithClaim", "yes"));
-            existingPrincipal.AddIdentity(identityNoAuthTypeWithClaim);
-            var identityEmptyWithAuthType = new ClaimsIdentity("empty");
-            existingPrincipal.AddIdentity(identityEmptyWithAuthType);
-
-            Assert.False(existingPrincipal.Identity.IsAuthenticated);
-
-            var newPrincipal = new ClaimsPrincipal();
-            var newEmptyIdentity = new ClaimsIdentity();
-            var identityTwo = new ClaimsIdentity("yep");
-            newPrincipal.AddIdentity(newEmptyIdentity);
-            newPrincipal.AddIdentity(identityTwo);
-
-            var user = SecurityHelper.MergeUserPrincipal(existingPrincipal, newPrincipal);
-
-            // Preserve newPrincipal order
-            Assert.False(user.Identity.IsAuthenticated);
-            Assert.Null(user.Identity.Name);
-
-            Assert.Equal(4, user.Identities.Count());
-            Assert.Equal(newEmptyIdentity, user.Identities.Skip(0).First());
-            Assert.Equal(identityTwo, user.Identities.Skip(1).First());
-            Assert.Equal(identityNoAuthTypeWithClaim, user.Identities.Skip(2).First());
-            Assert.Equal(identityEmptyWithAuthType, user.Identities.Skip(3).First());
-
-            // This merge should drop newEmptyIdentity since its empty
-            user = SecurityHelper.MergeUserPrincipal(user, new GenericPrincipal(new GenericIdentity("Test3", "Gamma"), new string[0]));
-
-            Assert.Equal("Gamma", user.Identity.AuthenticationType);
-            Assert.Equal("Test3", user.Identity.Name);
-
-            Assert.Equal(4, user.Identities.Count());
-            Assert.Equal("Test3", user.Identities.Skip(0).First().Name);
-            Assert.Equal(identityTwo, user.Identities.Skip(1).First());
-            Assert.Equal(identityNoAuthTypeWithClaim, user.Identities.Skip(2).First());
-            Assert.Equal(identityEmptyWithAuthType, user.Identities.Skip(3).First());
-        }
-    }
-}