Methods, non-transitory computer readable media, security management apparatuses, and network traffic management systems are disclosed that improve network security via input field obfuscation are disclosed. With this technology, a script is injected into source code of a web page received from a server. The source code is then sent to a requesting client. The script is configured to remove an event listener attached to a protected input field of the web page to provide a script secured input field. An application layer message that is received from the client is subsequently sent to the server. The application layer message includes data submitted via the script secured input field that prevented one or more keystrokes corresponding to the data from being observed by a source of the event listener.