diff --git a/inbc-program/README.md b/inbc-program/README.md
index b78943704..d63340214 100644
--- a/inbc-program/README.md
+++ b/inbc-program/README.md
@@ -424,6 +424,13 @@ inbc query --option sw
 Optionally Downloads and encrypts GPG key and stores it on the system under <em>/usr/share/keyrings</em>.  Creates a file under <em>/etc/apt/sources.list.d</em> to store the update source information.
 This list file is used during 'sudo apt update' to update the application.  <em>Deb882</em> format may be used instead of downloading a GPG key.
 
+**NOTE:** Make sure to add gpgKeyUri to trustedrepositories using INBC Config Append command before using Inbc source application add command
+          Step 1: Refer to Inbc Config Append command to set gpgKeyUri to trustedRepositories in intel-manageability.conf file
+                  Example: inbc append --path  trustedRepositories:https://deb.opera.com/
+          Step 2: Use Inbc source appplication add command 
+```
+
+
 ### Usage
 ```
 inbc source application add
@@ -449,7 +456,6 @@ inbc source application add
 
       - Each blank line has a period in it. -> " ."
       - Each line after the Signed-By: starts with a space -> " gibberish"
-
 ```
 inbc source application add 
    --sources 
diff --git a/inbm/Changelog.md b/inbm/Changelog.md
index 15b92ec13..aab0f0142 100644
--- a/inbm/Changelog.md
+++ b/inbm/Changelog.md
@@ -10,7 +10,9 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 
 ### Added
  - RTC 536601 - Added 'source' command to INBM. This command manages `/etc/apt/sources.list` and `/etc/apt/sources.list.d/*` and associated gpg keys on Ubuntu.
+- RTC 537769 -  Added verification of GPG key URIs against a list of trusted repositories for enhanced security
 
+check if sourceApplication Gpg key URL is in trusted repo
 ### Fixed
  - RTC 534426 - Could not write to /var/log/inbm-update-status.log on Yocto due to /var/log being a symlink to /var/volatile/log.
  - RTC 523677 - Improve INBC error logging - invalid child tag not printed
diff --git a/inbm/dispatcher-agent/dispatcher/dispatcher_class.py b/inbm/dispatcher-agent/dispatcher/dispatcher_class.py
index 60a62e41b..d5ca167c5 100644
--- a/inbm/dispatcher-agent/dispatcher/dispatcher_class.py
+++ b/inbm/dispatcher-agent/dispatcher/dispatcher_class.py
@@ -16,6 +16,7 @@
 from threading import Thread, active_count
 from time import sleep
 from typing import Tuple
+from typing import Optional, Any
 
 from dispatcher.config.config_operation import ConfigOperation
 from dispatcher.source.source_command import do_source_command
@@ -293,7 +294,7 @@ def do_install(self, xml: str, schema_location: Optional[str] = None) -> Result:
             elif type_of_manifest == 'source':
                 logger.debug('Running source command')
                 # FIXME: actually detect OS
-                result = do_source_command(parsed_head, source.constants.OsType.Ubuntu)
+                result = do_source_command(parsed_head, source.constants.OsType.Ubuntu, self._dispatcher_broker)
             elif type_of_manifest == 'ota':
                 # Parse manifest
                 header = parsed_head.get_children('ota/header')
diff --git a/inbm/dispatcher-agent/dispatcher/source/source_command.py b/inbm/dispatcher-agent/dispatcher/source/source_command.py
index c15aaa6e7..d7d3d043e 100644
--- a/inbm/dispatcher-agent/dispatcher/source/source_command.py
+++ b/inbm/dispatcher-agent/dispatcher/source/source_command.py
@@ -7,6 +7,8 @@
 import logging
 import json
 from dispatcher.common.result_constants import Result
+from typing import Optional, Any
+from dispatcher.dispatcher_broker import DispatcherBroker
 from dispatcher.source.constants import (
     ApplicationAddSourceParameters,
     ApplicationRemoveSourceParameters,
@@ -22,7 +24,7 @@
 logger = logging.getLogger(__name__)
 
 
-def do_source_command(parsed_head: XmlHandler, os_type: OsType) -> Result:
+def do_source_command(parsed_head: XmlHandler, os_type: OsType, dispatcher_broker: DispatcherBroker) -> Result:
     """
     Run a source command.
 
@@ -42,7 +44,7 @@ def do_source_command(parsed_head: XmlHandler, os_type: OsType) -> Result:
     try:
         app_action = parsed_head.get_children("applicationSource")
         if app_action:
-            return _handle_app_source_command(parsed_head, os_type, app_action)
+            return _handle_app_source_command(parsed_head, os_type, app_action, dispatcher_broker)
     except XmlException as e:
         return Result(status=400, message=f"unable to handle source command XML: {e}")
 
@@ -94,16 +96,17 @@ def _handle_os_source_command(parsed_head: XmlHandler, os_type: OsType, os_actio
 
 
 def _handle_app_source_command(
-        parsed_head: XmlHandler, os_type: OsType, app_action: dict) -> Result:
+        parsed_head: XmlHandler, os_type: OsType, app_action: dict, dispatcher_broker: DispatcherBroker) -> Result:
     """
     Handle the application source commands.
 
     @param parsed_head: XmlHandler with command information
     @param os_type: OS type
     @param app_action: The action to be performed
+    @param dispatcher_broker: MQTT
     @return Result
     """
-    application_source_manager = create_application_source_manager(os_type)
+    application_source_manager = create_application_source_manager(os_type, dispatcher_broker)
 
     if "list" in app_action:
         serialized_list = json.dumps(
diff --git a/inbm/dispatcher-agent/dispatcher/source/source_manager_factory.py b/inbm/dispatcher-agent/dispatcher/source/source_manager_factory.py
index 0f11c4b55..b89e4e157 100644
--- a/inbm/dispatcher-agent/dispatcher/source/source_manager_factory.py
+++ b/inbm/dispatcher-agent/dispatcher/source/source_manager_factory.py
@@ -5,9 +5,11 @@
     SPDX-License-Identifier: Apache-2.0
 """
 import logging
+from dispatcher.dispatcher_broker import DispatcherBroker
 
 from dispatcher.source.constants import OsType
 from dispatcher.source.source_manager import ApplicationSourceManager, OsSourceManager
+from typing import Optional, Any
 from dispatcher.source.ubuntu_source_manager import (
     UbuntuApplicationSourceManager,
     UbuntuOsSourceManager,
@@ -23,8 +25,8 @@ def create_os_source_manager(os_type: OsType) -> OsSourceManager:
     raise ValueError(f"Unsupported OS type: {os_type}.")
 
 
-def create_application_source_manager(os_type: OsType) -> ApplicationSourceManager:
+def create_application_source_manager(os_type: OsType, dispatcher_broker: DispatcherBroker) -> ApplicationSourceManager:
     """Return correct OS application manager based on OS type"""
     if os_type is OsType.Ubuntu:
-        return UbuntuApplicationSourceManager()
+        return UbuntuApplicationSourceManager(dispatcher_broker)
     raise ValueError(f"Unsupported OS type: {os_type}.")
diff --git a/inbm/dispatcher-agent/dispatcher/source/ubuntu_source_manager.py b/inbm/dispatcher-agent/dispatcher/source/ubuntu_source_manager.py
index fa321d08a..402825876 100644
--- a/inbm/dispatcher-agent/dispatcher/source/ubuntu_source_manager.py
+++ b/inbm/dispatcher-agent/dispatcher/source/ubuntu_source_manager.py
@@ -7,6 +7,9 @@
 import logging
 import os
 
+from dispatcher.packagemanager.package_manager import verify_source
+from dispatcher.dispatcher_broker import DispatcherBroker
+from dispatcher.dispatcher_exception import DispatcherException
 from dispatcher.source.source_exception import SourceError
 from dispatcher.source.constants import (
     UBUNTU_APT_SOURCES_LIST,
@@ -94,16 +97,24 @@ def update(self, parameters: SourceParameters) -> None:
 
 
 class UbuntuApplicationSourceManager(ApplicationSourceManager):
-    def __init__(self) -> None:
-        pass
+    def __init__(self, broker: DispatcherBroker) -> None:
+        self._dispatcher_broker = broker
 
     def add(self, parameters: ApplicationAddSourceParameters) -> None:
         """Adds a source file and optional GPG key to be used during Ubuntu application updates."""
-        # Step 1: Add key (Optional)
+        # Step 1: Verify gpg key uri from trusted repo list 
         if parameters.gpg_key_name and parameters.gpg_key_uri:
+            try:
+               url = parameters.gpg_key_uri
+               #URL slicing to remove the last segment (filename) from the URL 
+               source = url[:-(len(url.split('/')[-1]) + 1)]
+               verify_source(source=source, dispatcher_broker=self._dispatcher_broker)
+            except (DispatcherException, IndexError) as err:
+               raise SourceError(f"Source Gpg key URI verification check failed: {err}")
+            # Step 2: Add key (Optional)
             add_gpg_key(parameters.gpg_key_uri, parameters.gpg_key_name)
 
-        # Step 2: Add the source
+        # Step 3: Add the source
         try:
             create_file_with_contents(
                 os.path.join(UBUNTU_APT_SOURCES_LIST_D, parameters.source_list_file_name), parameters.sources
diff --git a/inbm/dispatcher-agent/tests/unit/source/test_source_cmd_factory.py b/inbm/dispatcher-agent/tests/unit/source/test_source_cmd_factory.py
index 44160db3e..4a3603640 100644
--- a/inbm/dispatcher-agent/tests/unit/source/test_source_cmd_factory.py
+++ b/inbm/dispatcher-agent/tests/unit/source/test_source_cmd_factory.py
@@ -1,5 +1,6 @@
 import pytest
 from dispatcher.source.constants import OsType
+from ..common.mock_resources import MockDispatcherBroker
 from dispatcher.source.source_manager_factory import (
     create_application_source_manager,
     create_os_source_manager,
@@ -20,13 +21,13 @@ def test_create_os_source_manager_unsupported():
         create_os_source_manager("UnsupportedOS")
     assert "Unsupported OS type" in str(excinfo.value)
 
-
 def test_create_application_source_manager_ubuntu():
-    command = create_application_source_manager(OsType.Ubuntu)
+    mock_disp_broker_obj = MockDispatcherBroker.build_mock_dispatcher_broker()
+    command = create_application_source_manager(OsType.Ubuntu, mock_disp_broker_obj)
     assert isinstance(command, UbuntuApplicationSourceManager)
 
-
 def test_create_application_source_manager_unsupported():
+    mock_disp_broker_obj = MockDispatcherBroker.build_mock_dispatcher_broker()
     with pytest.raises(ValueError) as excinfo:
-        create_application_source_manager("UnsupportedOS")
+        create_application_source_manager("UnsupportedOS", mock_disp_broker_obj)
     assert "Unsupported OS type" in str(excinfo.value)
diff --git a/inbm/dispatcher-agent/tests/unit/source/test_source_command.py b/inbm/dispatcher-agent/tests/unit/source/test_source_command.py
index 4d6d8fd19..31db61c07 100644
--- a/inbm/dispatcher-agent/tests/unit/source/test_source_command.py
+++ b/inbm/dispatcher-agent/tests/unit/source/test_source_command.py
@@ -7,6 +7,7 @@
 
 import pytest
 from dispatcher.common.result_constants import Result
+from ..common.mock_resources import MockDispatcherBroker
 from dispatcher.source.constants import (
     ApplicationAddSourceParameters,
     ApplicationRemoveSourceParameters,
@@ -66,8 +67,8 @@ def test_do_source_command_list(
     mock_source_manager.list.return_value = return_value
 
     mocker.patch(patch_target, return_value=mock_source_manager)
-
-    result = do_source_command(xml_handler, OsType.Ubuntu)
+    broker = MockDispatcherBroker.build_mock_dispatcher_broker()
+    result = do_source_command(xml_handler, OsType.Ubuntu, broker)
 
     assert result == Result(status=200, message=expected_message)
     mock_source_manager.list.assert_called_once()
@@ -113,8 +114,8 @@ def test_do_source_command_remove(
     mock_manager.remove.return_value = None
 
     mocker.patch(manager_mock, return_value=mock_manager)
-
-    result = do_source_command(xml_handler, os_type)
+    broker = MockDispatcherBroker.build_mock_dispatcher_broker()
+    result = do_source_command(xml_handler, os_type, broker)
 
     mock_manager.remove.assert_called_once_with(expected_call)
     assert result == Result(status=200, message="SUCCESS")
@@ -180,8 +181,8 @@ def test_do_source_command_add(
     mock_manager.add.return_value = None
 
     mocker.patch(manager_mock, return_value=mock_manager)
-
-    result = do_source_command(xml_handler, os_type)
+    broker = MockDispatcherBroker.build_mock_dispatcher_broker()
+    result = do_source_command(xml_handler, os_type, broker)
 
     mock_manager.add.assert_called_once_with(expected_call)
     assert result == Result(status=200, message="SUCCESS")
@@ -240,8 +241,8 @@ def test_do_source_command_update(
     mock_manager.update.return_value = None
 
     mocker.patch(manager_mock, return_value=mock_manager)
-
-    result = do_source_command(xml_handler, os_type)
+    broker = MockDispatcherBroker.build_mock_dispatcher_broker()
+    result = do_source_command(xml_handler, os_type, broker)
 
     mock_manager.update.assert_called_once_with(expected_call)
     assert result == Result(status=200, message="SUCCESS")
diff --git a/inbm/dispatcher-agent/tests/unit/source/test_ubuntu_source_cmd.py b/inbm/dispatcher-agent/tests/unit/source/test_ubuntu_source_cmd.py
index 749ab3a4e..d2bb0fdd8 100644
--- a/inbm/dispatcher-agent/tests/unit/source/test_ubuntu_source_cmd.py
+++ b/inbm/dispatcher-agent/tests/unit/source/test_ubuntu_source_cmd.py
@@ -2,6 +2,8 @@
 import pytest
 from unittest.mock import mock_open, patch
 from dispatcher.source.source_exception import SourceError
+from ..common.mock_resources import MockDispatcherBroker
+from dispatcher.dispatcher_exception import DispatcherException
 from dispatcher.source.constants import (
     UBUNTU_APT_SOURCES_LIST_D,
     UBUNTU_APT_SOURCES_LIST,
@@ -193,15 +195,17 @@ def test_update_sources_os_error(self):
 
 
 class TestUbuntuApplicationSourceManager:
-    def test_add_app_with_gpg_key_successfully(self):
+    @patch("dispatcher.source.ubuntu_source_manager.verify_source")
+    def test_add_app_with_gpg_key_successfully(self, mock_verify_source):
         try:
             params = ApplicationAddSourceParameters(
-                source_list_file_name="intel-gpu-jammy.list",
+                source_list_file_name="google-chrome.sources",
                 sources="deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main",
                 gpg_key_uri="https://dl-ssl.google.com/linux/linux_signing_key.pub",
                 gpg_key_name="google-chrome.gpg"
             )
-            command = UbuntuApplicationSourceManager()
+            broker = MockDispatcherBroker.build_mock_dispatcher_broker()
+            command = UbuntuApplicationSourceManager(broker)
             with (patch("builtins.open", new_callable=mock_open()),
                   patch("dispatcher.source.ubuntu_source_manager.add_gpg_key")):
                 command.add(params)
@@ -209,6 +213,7 @@ def test_add_app_with_gpg_key_successfully(self):
             pytest.fail(f"'UbuntuApplicationSourceManager.add' raised an exception {err}")
 
     def test_add_app_deb_822_format_successfully(self):
+        broker = MockDispatcherBroker.build_mock_dispatcher_broker()
         try:
             params = ApplicationAddSourceParameters(
                 source_list_file_name="google-chrome.sources",
@@ -219,7 +224,7 @@ def test_add_app_deb_822_format_successfully(self):
                         "Suites: stable"
                         "Components: main",
             )
-            command = UbuntuApplicationSourceManager()
+            command = UbuntuApplicationSourceManager(broker)
             with patch("builtins.open", new_callable=mock_open()):
                 command.add(params)
         except SourceError as err:
@@ -227,10 +232,11 @@ def test_add_app_deb_822_format_successfully(self):
 
     def test_update_app_source_successfully(self):
         try:
+            broker = MockDispatcherBroker.build_mock_dispatcher_broker()
             params = ApplicationUpdateSourceParameters(
                 source_list_file_name="intel-gpu-jammy.list", sources=APP_SOURCE
             )
-            command = UbuntuApplicationSourceManager()
+            command = UbuntuApplicationSourceManager(broker)
             with patch("builtins.open", new_callable=mock_open()):
                 command.update(params)
         except SourceError as err:
@@ -249,7 +255,8 @@ def test_list(self, sources_list_d_content):
         with patch("glob.glob", return_value=["/etc/apt/sources.list.d/example.list"]), patch(
             "builtins.open", mock_open(read_data=sources_list_d_content)
         ):
-            command = UbuntuApplicationSourceManager()
+            broker = MockDispatcherBroker.build_mock_dispatcher_broker()
+            command = UbuntuApplicationSourceManager(broker)
             sources = command.list()
             assert sources[0].name == "example.list"
             assert sources[0].sources == [
@@ -261,7 +268,8 @@ def test_list_raises_exception(self):
         with patch("glob.glob", return_value=["/etc/apt/sources.list.d/example.list"]), patch(
             "builtins.open", side_effect=OSError
         ):
-            command = UbuntuApplicationSourceManager()
+            broker = MockDispatcherBroker.build_mock_dispatcher_broker()
+            command = UbuntuApplicationSourceManager(broker)
             with pytest.raises(SourceError) as exc_info:
                 command.list()
             assert "Error listing application sources" in str(exc_info.value)
@@ -273,17 +281,49 @@ def test_successfully_remove_gpg_key_and_source_list(
         parameters = ApplicationRemoveSourceParameters(
             gpg_key_name="example_source.gpg", source_list_file_name="example_source.list"
         )
-        command = UbuntuApplicationSourceManager()
+        broker = MockDispatcherBroker.build_mock_dispatcher_broker()
+        command = UbuntuApplicationSourceManager(broker)
         try:
             command.remove(parameters)
         except SourceError:
             self.fail("Remove GPG key raised DispatcherException unexpectedly!")
 
+    @patch("dispatcher.source.ubuntu_source_manager.verify_source", side_effect=DispatcherException('error'))
+    def test_failed_add_gpg_key_method(self, mock_verify_source):
+        parameters = ApplicationAddSourceParameters(
+            source_list_file_name="example_source.list",
+            sources="deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main",
+            gpg_key_uri="https://dl-ssl.google.com/linux/linux_signing_key.pub",
+            gpg_key_name="name"
+        )
+        broker = MockDispatcherBroker.build_mock_dispatcher_broker()
+        command = UbuntuApplicationSourceManager(broker)
+        with pytest.raises(SourceError) as ex:
+            command.add(parameters)
+        assert str(ex.value) == 'Source Gpg key URI verification check failed: error'
+
+
+    @patch("dispatcher.source.ubuntu_source_manager.verify_source")
+    def test_success_add_gpg_key_method(self, mock_verify_source):
+        mock_verify_source.return_value = True 
+        parameters = ApplicationAddSourceParameters(
+            source_list_file_name="example_source.list",
+            sources="deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main",
+            gpg_key_uri="https://dl-ssl.google.com/linux/linux_signing_key.pub",
+            gpg_key_name="name"
+        )
+        broker = MockDispatcherBroker.build_mock_dispatcher_broker()
+        command = UbuntuApplicationSourceManager(broker)
+        with (patch("builtins.open", new_callable=mock_open()),
+              patch("dispatcher.source.ubuntu_source_manager.add_gpg_key")):    
+            command.add(parameters)
+
     def test_raises_when_space_check_fails(self):
         parameters = ApplicationRemoveSourceParameters(
             gpg_key_name="example_source.gpg", source_list_file_name="../example_source.list"
         )
-        command = UbuntuApplicationSourceManager()
+        broker = MockDispatcherBroker.build_mock_dispatcher_broker()
+        command = UbuntuApplicationSourceManager(broker)
         with pytest.raises(SourceError) as ex:
             command.remove(parameters)
         assert str(ex.value) == "Invalid file name: ../example_source.list"
@@ -293,7 +333,8 @@ def test_raises_when_unable_to_remove_file(self, mock_remove_file):
         parameters = ApplicationRemoveSourceParameters(
             gpg_key_name="example_source.gpg", source_list_file_name="example_source.list"
         )
-        command = UbuntuApplicationSourceManager()
+        broker = MockDispatcherBroker.build_mock_dispatcher_broker()
+        command = UbuntuApplicationSourceManager(broker)
         with pytest.raises(SourceError) as ex:
             command.remove(parameters)
-        assert str(ex.value) == "Error removing file: example_source.list"
+        assert str(ex.value) == "Error removing file: example_source.list"
\ No newline at end of file
diff --git a/inbm/integration-reloaded/test/source/SOURCE.sh b/inbm/integration-reloaded/test/source/SOURCE.sh
index e8c69ef13..940384dc6 100755
--- a/inbm/integration-reloaded/test/source/SOURCE.sh
+++ b/inbm/integration-reloaded/test/source/SOURCE.sh
@@ -31,7 +31,10 @@ trap test_failed ERR
 
 echo "Starting source test." | systemd-cat
 
-# OS tests
+# Adding to trusted repo
+inbc append --path  trustedRepositories:https://deb.opera.com/
+
+#OS tests
 inbc source os add --sources "$FAKE_SOURCE"
 grep "$FAKE_SOURCE" "$APT_SOURCES"
 inbc source os list 2>&1 | grep "$FAKE_SOURCE"