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Entropy 2015, 17(6), 3806-3837; doi:10.3390/e17063806

On the Detection of Fake Certificates via Attribute Correlation

Key Laboratory of Advanced Control and Optimization for Chemical Process, Ministry of Education,East China University of Science and Technology, 200237 Shanghai, China
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Academic Editor: Antonio M. Scarfone
Received: 14 November 2014 / Accepted: 1 June 2015 / Published: 8 June 2015
(This article belongs to the Section Statistical Mechanics)
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Abstract

Transport Layer Security (TLS) and its predecessor, SSL, are important cryptographic protocol suites on the Internet. They both implement public key certificates and rely on a group of trusted certificate authorities (i.e., CAs) for peer authentication. Unfortunately, the most recent research reveals that, if any one of the pre-trusted CAs is compromised, fake certificates can be issued to intercept the corresponding SSL/TLS connections. This security vulnerability leads to catastrophic impacts on SSL/TLS-based HTTPS, which is the underlying protocol to provide secure web services for e-commerce, e-mails, etc. To address this problem, we design an attribute dependency-based detection mechanism, called SSLight. SSLight can expose fake certificates by checking whether the certificates contain some attribute dependencies rarely occurring in legitimate samples. We conduct extensive experiments to evaluate SSLight and successfully confirm that SSLight can detect the vast majority of fake certificates issued from any trusted CAs if they are compromised. As a real-world example, we also implement SSLight as a Firefox add-on and examine its capability of exposing existent fake certificates from DigiNotar and Comodo, both of which have made a giant impact around the world. View Full-Text
Keywords: certification; man-in-the-middle attacks; attribute correlation certification; man-in-the-middle attacks; attribute correlation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Gu, X.; Gu, X. On the Detection of Fake Certificates via Attribute Correlation. Entropy 2015, 17, 3806-3837.

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