diff --git a/task_module.py b/task_module.py
new file mode 100644
index 0000000..0000001
--- /dev/null
+++ b/task_module.py
@@ -0,0 +1,20 @@
+from graphene import Scalar
+from base64 import b64encode, b64decode
+
+class SecureToken(Scalar):
+    @staticmethod
+    def serialize(value):
+        if not isinstance(value, (str, bytes)):
+            raise TypeError("SecureToken expects string or bytes")
+        value = value if isinstance(value, bytes) else value.encode("utf-8")
+        encoded = b64encode(value).decode("utf-8")
+        return f"tok_{encoded}"
+
+    @staticmethod
+    def parse_value(value):
+        if not isinstance(value, str):
+            raise TypeError("SecureToken expects string")
+        if not value.startswith("tok_"):
+            raise ValueError("Invalid prefix")
+        encoded = value[4:]
+        return b64decode(encoded)
\ No newline at end of file