GuardedID is described as 'takes a proactive approach to stopping malicious keylogging programs by encrypting every keystroke at the point of typing the keys, and rerouting those encrypted keystrokes directly to your Internet Explorer browser through its own unique path'. There are five alternatives to GuardedID for Windows. The best alternative is KeyScrambler, which is free. Other great apps like GuardedID are Ghostpress (Free), Oxynger KeyShield (Free), Zemana AntiLogger (Paid) and ScreenWings (Free).
KeyScrambler encrypts your keystrokes at the keyboard-driver level in the kernel as they enter the computer and decrypts the keystrokes at the destination application so that you see exactly the keys you've typed.