diff --git a/MdePkg/Include/Guid/GlobalVariable.h b/MdePkg/Include/Guid/GlobalVariable.h
index eb2ce6aaf2..eb6e5a043e 100644
--- a/MdePkg/Include/Guid/GlobalVariable.h
+++ b/MdePkg/Include/Guid/GlobalVariable.h
@@ -1,7 +1,7 @@
 /** @file
   GUID for EFI (NVRAM) Variables.
 
-  Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2006 - 2024, Intel Corporation. All rights reserved.<BR>
   SPDX-License-Identifier: BSD-2-Clause-Patent
 
   @par Revision Reference:
@@ -183,4 +183,10 @@ extern EFI_GUID  gEfiGlobalVariableGuid;
 ///
 #define EFI_VENDOR_KEYS_VARIABLE_NAME  L"VendorKeys"
 
+///
+/// Whether the platform firmware is operating in device authentication boot mode (1) or not (0).
+/// The content is UINT8.
+///
+#define EFI_DEVICE_AUTH_BOOT_MODE_NAME  L"devAuthBoot"
+
 #endif
diff --git a/MdePkg/Include/Guid/ImageAuthentication.h b/MdePkg/Include/Guid/ImageAuthentication.h
index fe83596571..f95255c0fb 100644
--- a/MdePkg/Include/Guid/ImageAuthentication.h
+++ b/MdePkg/Include/Guid/ImageAuthentication.h
@@ -1,7 +1,7 @@
 /** @file
   Image signature database are defined for the signed image validation.
 
-  Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2009 - 2024, Intel Corporation. All rights reserved.<BR>
   SPDX-License-Identifier: BSD-2-Clause-Patent
 
   @par Revision Reference:
@@ -41,6 +41,9 @@
 #define SETUP_MODE  1
 #define USER_MODE   0
 
+#define DEVICE_AUTH_BOOT_MODE_ENABLE   1
+#define DEVICE_AUTH_BOOT_MODE_DISABLE  0
+
 // ***********************************************************************
 // Signature Database
 // ***********************************************************************