Techniques for improving security of transactions requesting user authentication data entry via mobile devices are described herein. The mobile device is configured to wirelessly communicate using a near field communications (NFC) standard used to communicate over very short distances. The mobile device includes a graphical user interface (GUI) configured to display a virtual keypad arranged in a randomly generated pattern, the pattern being configured to be changed in a random manner at each instance of displaying the virtual keypad. Security of transaction is improved by randomly changing positions of virtual keys of the virtual keypad configured to receive the user authentication data.