diff --git a/monkey/monkey_island/cc/services/__init__.py b/monkey/monkey_island/cc/services/__init__.py
index 83cbf3492..b3dcba9de 100644
--- a/monkey/monkey_island/cc/services/__init__.py
+++ b/monkey/monkey_island/cc/services/__init__.py
@@ -1 +1,2 @@
 from .authentication.authentication_service import AuthenticationService
+from .authentication.json_file_user_datastore import JsonFileUserDatastore
diff --git a/monkey/monkey_island/cc/services/authentication/json_file_user_datastore.py b/monkey/monkey_island/cc/services/authentication/json_file_user_datastore.py
new file mode 100644
index 000000000..7dd8d82b7
--- /dev/null
+++ b/monkey/monkey_island/cc/services/authentication/json_file_user_datastore.py
@@ -0,0 +1,57 @@
+import json
+from pathlib import Path
+
+from common.utils.exceptions import (
+    AlreadyRegisteredError,
+    InvalidRegistrationCredentialsError,
+    UnknownUserError,
+)
+from monkey_island.cc.environment.user_creds import UserCreds
+
+from .i_user_datastore import IUserDatastore
+
+CREDENTIALS_FILE = "credentials.json"
+
+
+class JsonFileUserDatastore(IUserDatastore):
+    def __init__(self, data_dir: Path):
+        self._credentials = None
+        self._credentials_file = data_dir / CREDENTIALS_FILE
+
+        if self._credentials_file.exists():
+            self._credentials = self._load_from_file()
+
+    def _load_from_file(self) -> UserCreds:
+        with open(self._credentials_file, "r") as f:
+            credentials_dict = json.load(f)
+
+            return UserCreds(credentials_dict["user"], credentials_dict["password_hash"])
+
+    def has_registered_users(self) -> bool:
+        return self._credentials is not None
+
+    def add_user(self, credentials: UserCreds):
+        if credentials is None:
+            raise InvalidRegistrationCredentialsError("Credentials can not be 'None'")
+        elif not credentials.username:
+            raise InvalidRegistrationCredentialsError("Username can not be empty")
+        elif not credentials.password_hash:
+            raise InvalidRegistrationCredentialsError("Password hash can not be empty")
+
+        if self._credentials:
+            raise AlreadyRegisteredError(
+                "User has already been registered. Reset credentials or login."
+            )
+
+        self._credentials = credentials
+        self._store_credentials_to_file()
+
+    def _store_credentials_to_file(self):
+        with open(self._credentials_file, "w") as f:
+            json.dump(self._credentials.to_dict(), f, indent=2)
+
+    def get_user_credentials(self, username: str) -> UserCreds:
+        if self._credentials.username != username:
+            raise UnknownUserError(f"User {username} does not exist.")
+
+        return self._credentials
diff --git a/monkey/tests/data_for_tests/credentials.json b/monkey/tests/data_for_tests/credentials.json
new file mode 100644
index 000000000..440f7fc8b
--- /dev/null
+++ b/monkey/tests/data_for_tests/credentials.json
@@ -0,0 +1,4 @@
+{
+  "user": "new_user",
+  "password_hash": "new_hash"
+}
diff --git a/monkey/tests/unit_tests/monkey_island/cc/services/test_json_file_user_datastore.py b/monkey/tests/unit_tests/monkey_island/cc/services/test_json_file_user_datastore.py
new file mode 100644
index 000000000..35b342a9f
--- /dev/null
+++ b/monkey/tests/unit_tests/monkey_island/cc/services/test_json_file_user_datastore.py
@@ -0,0 +1,77 @@
+import pytest
+
+from common.utils.exceptions import (
+    AlreadyRegisteredError,
+    InvalidRegistrationCredentialsError,
+    UnknownUserError,
+)
+from monkey_island.cc.environment.user_creds import UserCreds
+from monkey_island.cc.services.authentication.json_file_user_datastore import (
+    CREDENTIALS_FILE,
+    JsonFileUserDatastore,
+)
+
+USERNAME = "test"
+PASSWORD_HASH = "DEADBEEF"
+
+
+@pytest.fixture
+def empty_datastore(tmp_path):
+    return JsonFileUserDatastore(tmp_path)
+
+
+@pytest.fixture
+def populated_datastore(data_for_tests_dir):
+    return JsonFileUserDatastore(data_for_tests_dir)
+
+
+def test_has_registered_users_pre_registration(empty_datastore):
+    assert not empty_datastore.has_registered_users()
+
+
+def test_has_registered_users_after_registration(populated_datastore):
+    assert populated_datastore.has_registered_users()
+
+
+def test_add_user(empty_datastore, tmp_path):
+    datastore = empty_datastore
+
+    datastore.add_user(UserCreds(USERNAME, PASSWORD_HASH))
+    assert datastore.has_registered_users()
+    assert (tmp_path / CREDENTIALS_FILE).exists()
+
+
+def test_add_user__None_creds(empty_datastore):
+    with pytest.raises(InvalidRegistrationCredentialsError):
+        empty_datastore.add_user(None)
+
+
+def test_add_user__empty_username(empty_datastore):
+    with pytest.raises(InvalidRegistrationCredentialsError):
+        empty_datastore.add_user(UserCreds("", PASSWORD_HASH))
+
+
+def test_add_user__empty_password_hash(empty_datastore):
+    with pytest.raises(InvalidRegistrationCredentialsError):
+        empty_datastore.add_user(UserCreds(USERNAME, ""))
+
+
+def test_add_user__already_registered(populated_datastore):
+    with pytest.raises(AlreadyRegisteredError):
+        populated_datastore.add_user(UserCreds("new_user", "new_hash"))
+
+
+def test_get_user_credentials_from_file(tmp_path):
+    empty_datastore = JsonFileUserDatastore(tmp_path)
+    empty_datastore.add_user(UserCreds(USERNAME, PASSWORD_HASH))
+
+    populated_datastore = JsonFileUserDatastore(tmp_path)
+    stored_user = populated_datastore.get_user_credentials(USERNAME)
+
+    assert stored_user.username == USERNAME
+    assert stored_user.password_hash == PASSWORD_HASH
+
+
+def test_get_unknown_user(populated_datastore):
+    with pytest.raises(UnknownUserError):
+        populated_datastore.get_user_credentials("unregistered_user")