diff --git a/test/py/tests/test_efi_secboot/conftest.py b/test/py/tests/test_efi_secboot/conftest.py
index c3d56622a2..7bb2e1d765 100644
--- a/test/py/tests/test_efi_secboot/conftest.py
+++ b/test/py/tests/test_efi_secboot/conftest.py
@@ -116,6 +116,10 @@ def efi_boot_env(request, u_boot_config):
         check_call('cd %s; %scert-to-efi-hash-list -g %s -t 0 -s 256 db.crt dbx_hash.crl; %ssign-efi-sig-list -t "2020-04-05" -c KEK.crt -k KEK.key dbx dbx_hash.crl dbx_hash.auth'
                    % (mnt_point, EFITOOLS_PATH, GUID, EFITOOLS_PATH),
                    shell=True)
+        ## dbx_hash1 (digest of TEST_db1 certificate)
+        check_call('cd %s; %scert-to-efi-hash-list -g %s -t 0 -s 256 db1.crt dbx_hash1.crl; %ssign-efi-sig-list -t "2020-04-05" -c KEK.crt -k KEK.key dbx dbx_hash1.crl dbx_hash1.auth'
+                   % (mnt_point, EFITOOLS_PATH, GUID, EFITOOLS_PATH),
+                   shell=True)

         # Copy image
         check_call('cp %s %s' % (HELLO_PATH, mnt_point), shell=True)
@@ -123,7 +127,10 @@ def efi_boot_env(request, u_boot_config):
         # Sign image
         check_call('cd %s; sbsign --key db.key --cert db.crt helloworld.efi'
                    % mnt_point, shell=True)
-        # Digest image
+        ## Sign already-signed image with another key
+        check_call('cd %s; sbsign --key db1.key --cert db1.crt --output helloworld.efi.signed_2sigs helloworld.efi.signed'
+                   % mnt_point, shell=True)
+        ## Digest image
         check_call('cd %s; %shash-to-efi-sig-list helloworld.efi db_hello.hash; %ssign-efi-sig-list -t "2020-04-07" -c KEK.crt -k KEK.key db db_hello.hash db_hello.auth'
                    % (mnt_point, EFITOOLS_PATH, EFITOOLS_PATH),
                    shell=True)
diff --git a/test/py/tests/test_efi_secboot/test_signed.py b/test/py/tests/test_efi_secboot/test_signed.py
index 6dabecb669..1a31a57e12 100644
--- a/test/py/tests/test_efi_secboot/test_signed.py
+++ b/test/py/tests/test_efi_secboot/test_signed.py
@@ -147,3 +147,54 @@ class TestEfiSignedImage(object):
                 'efidebug test bootmgr'])
             assert '\'HELLO\' failed' in ''.join(output)
             assert 'efi_start_image() returned: 26' in ''.join(output)
+
+    def test_efi_signed_image_auth5(self, u_boot_console, efi_boot_env):
+        """
+        Test Case 5 - multiple signatures
+                        one signed with TEST_db, and
+                        one signed with TEST_db1
+        """
+        u_boot_console.restart_uboot()
+        disk_img = efi_boot_env
+        with u_boot_console.log.section('Test Case 5a'):
+            # Test Case 5a, rejected if any of signatures is not verified
+            output = u_boot_console.run_command_list([
+                'host bind 0 %s' % disk_img,
+                'fatload host 0:1 4000000 db.auth',
+                'setenv -e -nv -bs -rt -at -i 4000000,$filesize db',
+                'fatload host 0:1 4000000 KEK.auth',
+                'setenv -e -nv -bs -rt -at -i 4000000,$filesize KEK',
+                'fatload host 0:1 4000000 PK.auth',
+                'setenv -e -nv -bs -rt -at -i 4000000,$filesize PK'])
+            assert 'Failed to set EFI variable' not in ''.join(output)
+            output = u_boot_console.run_command_list([
+                'efidebug boot add 1 HELLO host 0:1 /helloworld.efi.signed_2sigs ""',
+                'efidebug boot next 1',
+                'efidebug test bootmgr'])
+            assert '\'HELLO\' failed' in ''.join(output)
+            assert 'efi_start_image() returned: 26' in ''.join(output)
+
+        with u_boot_console.log.section('Test Case 5b'):
+            # Test Case 5b, authenticated if both signatures are verified
+            output = u_boot_console.run_command_list([
+                'fatload host 0:1 4000000 db1.auth',
+                'setenv -e -nv -bs -rt -at -a -i 4000000,$filesize db'])
+            assert 'Failed to set EFI variable' not in ''.join(output)
+            output = u_boot_console.run_command_list([
+                'efidebug boot add 1 HELLO host 0:1 /helloworld.efi.signed_2sigs ""',
+                'efidebug boot next 1',
+                'bootefi bootmgr'])
+            assert 'Hello, world!' in ''.join(output)
+
+        with u_boot_console.log.section('Test Case 5c'):
+            # Test Case 5c, rejected if any of signatures is revoked
+            output = u_boot_console.run_command_list([
+                'fatload host 0:1 4000000 dbx_hash1.auth',
+                'setenv -e -nv -bs -rt -at -i 4000000,$filesize dbx'])
+            assert 'Failed to set EFI variable' not in ''.join(output)
+            output = u_boot_console.run_command_list([
+                'efidebug boot add 1 HELLO host 0:1 /helloworld.efi.signed_2sigs ""',
+                'efidebug boot next 1',
+                'efidebug test bootmgr'])
+            assert '\'HELLO\' failed' in ''.join(output)
+            assert 'efi_start_image() returned: 26' in ''.join(output)
