diff --git a/include/flags.h b/include/flags.h
index 902e758..7bc540a 100644
--- a/include/flags.h
+++ b/include/flags.h
@@ -1,4 +1,10 @@
 #ifndef WHY2_FLAGS_H
 #define WHY2_FLAGS_H
 
+#define KEY_LENGTH 50
+#define ENCRYPTION_SEPARATOR '.'
+#define ENCRYPTION_SEPARATOR_STRING "."
+
+#define INVALID_KEY 1
+
 #endif
\ No newline at end of file