Physical Password Breaking via Thermal Sequence Analysis
Abstract
The thermal camera can capture keyboard surface temperature change after a human's touch. This phenomenon may be used to steal users' passwords physically. In this paper, based on the study of thermal dynamics of keyboards, we design a password break system using an infrared thermal camera. First, we build a signal model to describe the dynamic process of temperature change on the keyboard using Newton's law of cooling. Next, we develop a maximum likelihood parameter estimation algorithm to estimate the keystroke time instants. Then, by maximizing the probability of key order arrangement, a novel password breaking algorithm is developed. Our algorithm is tested using simulated data as well as real-world data. Experiment results show that our algorithm is effective for physical password breaking using thermal characteristics. Based on our results, we discuss strategies for password protection at the end.
- Publication:
-
IEEE Transactions on Information Forensics
- Pub Date:
- 2019
- DOI:
- Bibcode:
- 2019ITIF...14.1142L
- Keywords:
-
- Information protection;
- thermal image;
- sequence analysis;
- password;
- curve fitting