Enhancing the Security of Personal Identification Numbers with Three-Dimensional Displays
Figure 1
Example round to input “1” in the binary PIN-entry method [6] (reproduction of Figure 1 in [7]). The user enters “Black,” “Black,” “White,” and “White” in sequence. (a) Stage 1. (b) Stage 2. (c) Stage 3. (d) Stage 4.
