Evaluation and improvement of the tempest fonts

Authors:
Hidema Tanaka;Osamu Takizawa;Akihiro Yamamura
Affiliations:
National Institute of Information and Communications Technology, Tokyo, Japan;National Institute of Information and Communications Technology, Tokyo, Japan;National Institute of Information and Communications Technology, Tokyo, Japan
Venue:
WISA'04 Proceedings of the 5th international conference on Information Security Applications
Year:
2004

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Abstract

Information leakage via electromagnetic emanation, usually known as Tempest, has been recognized as a threat and countermeasures have been proposed. In particular, Kuhn and Anderson developed a protective measure for Tempest called the Tempest fonts. Through experiments, we have investigated and evaluated the effectiveness of the Tempest fonts. Furthermore, we propose a new measure based on a similar approach to prevent successful Tempest attacks. While Kuhn and Anderson use Fourier transformation as a low-pass filter, our approach uses a Gaussian filter in addition to Fourier transformation. Our experimental results show that this approach is more effective.