diff --git a/pyproject.toml b/pyproject.toml
index a6583a07..67216ab2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -54,7 +54,16 @@ env = [
   "INST_DB_USER=user",
   "INST_DB_PWD=user",
   "INST_DB_HOST=localhost:5432",
-  "INST_DB_NAME=filing"
+  "INST_DB_NAME=filing",
+  "KC_URL=http://localhost",
+  "KC_REALM=",
+  "KC_ADMIN_CLIENT_ID=",
+  "KC_ADMIN_CLIENT_SECRET=",
+  "KC_REALM_URL=http://localhost",
+  "AUTH_URL=http://localhost",
+  "TOKEN_URL=http://localhost",
+  "CERTS_URL=http://localhost",
+  "AUTH_CLIENT=",
 ]
 testpaths = ["tests"]
 
diff --git a/src/config.py b/src/config.py
index 627df8c3..47b604df 100644
--- a/src/config.py
+++ b/src/config.py
@@ -6,6 +6,8 @@
 from pydantic.networks import PostgresDsn
 from pydantic_settings import BaseSettings, SettingsConfigDict
 
+from regtech_api_commons.oauth2.config import KeycloakSettings
+
 env_files_to_load = [".env"]
 if os.getenv("ENV", "LOCAL") == "LOCAL":
     env_files_to_load.append(".env.local")
@@ -39,3 +41,5 @@ def build_postgres_dsn(cls, postgres_dsn, info: ValidationInfo) -> Any:
 
 
 settings = Settings()
+
+kc_settings = KeycloakSettings(_env_file=env_files_to_load)
diff --git a/src/main.py b/src/main.py
index ee7ddf14..b3516718 100644
--- a/src/main.py
+++ b/src/main.py
@@ -1,12 +1,20 @@
 import os
 
 from fastapi import FastAPI
+from fastapi.security import OAuth2AuthorizationCodeBearer
+from fastapi.middleware.cors import CORSMiddleware
+from starlette.middleware.authentication import AuthenticationMiddleware
+
+from regtech_api_commons.oauth2.oauth2_backend import BearerTokenAuthBackend
+from regtech_api_commons.oauth2.oauth2_admin import OAuth2Admin
 
 from routers import filing_router
 
 from alembic.config import Config
 from alembic import command
 
+from config import kc_settings
+
 app = FastAPI()
 
 
@@ -19,4 +27,17 @@ async def app_start():
     command.upgrade(alembic_cfg, "head")
 
 
+token_bearer = OAuth2AuthorizationCodeBearer(
+    authorizationUrl=kc_settings.auth_url.unicode_string(), tokenUrl=kc_settings.token_url.unicode_string()
+)
+
+app.add_middleware(AuthenticationMiddleware, backend=BearerTokenAuthBackend(token_bearer, OAuth2Admin(kc_settings)))
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],
+    allow_methods=["*"],
+    allow_headers=["authorization"],
+)
+
+
 app.include_router(filing_router, prefix="/v1/filing")
diff --git a/src/routers/filing.py b/src/routers/filing.py
index 3f3bb363..acde7202 100644
--- a/src/routers/filing.py
+++ b/src/routers/filing.py
@@ -10,6 +10,8 @@
 
 from sqlalchemy.ext.asyncio import AsyncSession
 
+from starlette.authentication import requires
+
 
 async def set_db(request: Request, session: Annotated[AsyncSession, Depends(get_session)]):
     request.state.db_session = session
@@ -19,6 +21,7 @@ async def set_db(request: Request, session: Annotated[AsyncSession, Depends(get_
 
 
 @router.get("/periods", response_model=List[FilingPeriodDTO])
+@requires("authenticated")
 async def get_filing_periods(request: Request):
     return await repo.get_filing_periods(request.state.db_session)
 
@@ -33,5 +36,6 @@ async def upload_file(
 
 
 @router.get("/{lei}/filings/{filing_id}/submissions", response_model=List[SubmissionDTO])
+@requires("authenticated")
 async def get_submission(request: Request, lei: str, filing_id: int):
     return await repo.get_submissions(request.state.db_session, filing_id)
diff --git a/tests/api/conftest.py b/tests/api/conftest.py
index 4ead5458..5bccf6bf 100644
--- a/tests/api/conftest.py
+++ b/tests/api/conftest.py
@@ -7,6 +7,9 @@
 
 from entities.models import FilingPeriodDAO, FilingType
 
+from regtech_api_commons.models.auth import AuthenticatedUser
+from starlette.authentication import AuthCredentials, UnauthenticatedUser
+
 
 @pytest.fixture
 def app_fixture(mocker: MockerFixture) -> FastAPI:
@@ -15,6 +18,32 @@ def app_fixture(mocker: MockerFixture) -> FastAPI:
     return app
 
 
+@pytest.fixture
+def auth_mock(mocker: MockerFixture) -> Mock:
+    return mocker.patch("regtech_api_commons.oauth2.oauth2_backend.BearerTokenAuthBackend.authenticate")
+
+
+@pytest.fixture
+def authed_user_mock(auth_mock: Mock) -> Mock:
+    claims = {
+        "name": "test",
+        "preferred_username": "test_user",
+        "email": "test@local.host",
+        "institutions": "123456ABCDEF, 654321FEDCBA",
+    }
+    auth_mock.return_value = (
+        AuthCredentials(["authenticated"]),
+        AuthenticatedUser.from_claim(claims),
+    )
+    return auth_mock
+
+
+@pytest.fixture
+def unauthed_user_mock(auth_mock: Mock) -> Mock:
+    auth_mock.return_value = (AuthCredentials("unauthenticated"), UnauthenticatedUser())
+    return auth_mock
+
+
 @pytest.fixture
 def get_filing_period_mock(mocker: MockerFixture) -> Mock:
     mock = mocker.patch("entities.repos.submission_repo.get_filing_periods")
diff --git a/tests/api/routers/test_filing_api.py b/tests/api/routers/test_filing_api.py
index 2a695fa1..9e711c11 100644
--- a/tests/api/routers/test_filing_api.py
+++ b/tests/api/routers/test_filing_api.py
@@ -8,14 +8,30 @@
 
 
 class TestFilingApi:
-    def test_get_periods(self, mocker: MockerFixture, app_fixture: FastAPI, get_filing_period_mock: Mock):
+    def test_unauthed_get_periods(
+        self, mocker: MockerFixture, app_fixture: FastAPI, get_filing_period_mock: Mock, unauthed_user_mock: Mock
+    ):
+        client = TestClient(app_fixture)
+        res = client.get("/v1/filing/periods")
+        assert res.status_code == 403
+
+    def test_get_periods(
+        self, mocker: MockerFixture, app_fixture: FastAPI, get_filing_period_mock: Mock, authed_user_mock: Mock
+    ):
         client = TestClient(app_fixture)
         res = client.get("/v1/filing/periods")
         assert res.status_code == 200
         assert len(res.json()) == 1
         assert res.json()[0]["name"] == "FilingPeriod2024"
 
-    async def test_get_submissions(self, mocker: MockerFixture, app_fixture: FastAPI):
+    def test_unauthed_get_submissions(
+        self, mocker: MockerFixture, app_fixture: FastAPI, get_filing_period_mock: Mock, unauthed_user_mock: Mock
+    ):
+        client = TestClient(app_fixture)
+        res = client.get("/v1/filing/123456790/filings/1/submissions")
+        assert res.status_code == 403
+
+    async def test_get_submissions(self, mocker: MockerFixture, app_fixture: FastAPI, authed_user_mock: Mock):
         mock = mocker.patch("entities.repos.submission_repo.get_submissions")
         mock.return_value = [
             SubmissionDAO(