Usability of Augmented Reality for Revealing Secret Messages to Users but Not Their Devices
Sarah J. Andrabi, Michael K. Reiter, Cynthia Sturton · 2015
We evaluate the possibility of a human receiving a secret message while trusting no device with the contents of that message, by using visual cryptography (VC) implemented with augmented-reality displays (ARDs). In a pilot user study using Google Glass and an improved study using the Epson Moverio, users were successfully able to decode VC messages using ARDs. In particular, 26 out of 30 partic-ipants in the Epson Moverio study decoded numbers and letters with 100 % accuracy. Our studies also tested assump-tions made in previous VC research about users ’ abilities to detect active modification of a ciphertext. While a majority of the participants could identify that the images were mod-ified, fewer participants could detect all of the modifications in the ciphertext or the decoded plaintext. 1.