diff --git a/src/controller/app.py b/src/controller/app.py
index a6ae9b6..b2a9118 100644
--- a/src/controller/app.py
+++ b/src/controller/app.py
@@ -15,7 +15,10 @@ log = logging.getLogger(__name__)
 async def setup_token(solvable_connector, token):
     solvable_connector.send('token', token)
     key, data = await solvable_connector.recv()
-    log.debug('Token setup is done.')
+    if secrets.compare_digest(token, key):
+        log.debug('Token setup is done.')
+    else:
+        log.error('Failed to setup token between controller and solvable.')  # TODO: signaling to Avatao platform?
 
 if __name__ == '__main__':
     kwargs = {