A system and method for securing input signals when using input interfaces such as touch-screens and other input interfaces that are suitable for handheld, mobile, computing and other devices, by generating fake signals. In accordance with an embodiment, the technique can be used to protect input signals from, e.g. a touch-screen keyboard, and make it more difficult for malicious software applications to intercept and understand such input signals. The technique can also be implemented without requiring significant changes to the underlying operating system (OS) or graphical user interface (GUI). In accordance with an embodiment, a security enhancer or security enhancing application injects fake signals into the OS/GUI input signals queue. The security enhancer or security enhancing application is also associated with a communication channel that allows it to establish a cryptographic signature or key with authorized or sensitive application receivers that are authorized to receive the input signals. The fake signals can later be removed from the input signal stream only by the authorized receivers of the input signals. Unauthorized application listeners may be able to intercept a signal, but are unable to determine the original input.