diff --git a/Library/Engine.cs b/Library/Engine.cs
index b40f950..9f0782d 100644
--- a/Library/Engine.cs
+++ b/Library/Engine.cs
@@ -138,11 +138,11 @@ public class Engine
 			if (Cryptography.VerifySignedDataByCertIssuer(signature, open_key_path.GetPublicCert(), out var data))
 			{
 				if (data != null)
-					return true;
+					return false;
 			}
 			else
 			{
-				return false;
+				return true;
 			}
 		}
 		catch (Exception ex)