fix python sdk (#605)

diff --git a/sdk/python/teaclave.py b/sdk/python/teaclave.py
index 0fad8a9..ed9b1f1 100644
--- a/sdk/python/teaclave.py
+++ b/sdk/python/teaclave.py
@@ -459,7 +459,7 @@
         _write_message(self.channel, request)
         response = _read_message(self.channel)
         if response["result"] == "ok":
-            return response["content"]["token"]
+            return response["content"]["password"]
         else:
             reason = "unknown"
             if "request_error" in response: