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Computer Security Foundations Symposium (CSF 2014), Date: 2014/07/19 - 2014/07/22, Location: Vienna, Austria

Publication date: 2014-07-01
Volume: 2014-January Pages: 293 - 307
ISSN: 978-1-4799-4290-9
Publisher: IEEE

2014 IEEE 27th Computer Security Foundations Symposium (CSF 2014)

Author:

Vanhoef, Mathy
De Groef, Willem ; Devriese, Dominique ; Piessens, Frank ; Rezk, Tamara

Keywords:

Science & Technology, Technology, Computer Science, Theory & Methods, Engineering, Electrical & Electronic, Computer Science, Engineering

Abstract:

© 2014 IEEE. We propose a novel mechanism for enforcing information flow policies with support for declassification on event-driven programs. Declassification policies consist of two functions. First, a projection function specifies for each confidential event what information in the event can be declassified directly. This generalizes the traditional security labelling of inputs. Second, a stateful release function specifies the aggregate information about all confidential events seen so far that can be declassified. We provide evidence that such declassification policies are useful in the context of Java Script web applications. An enforcement mechanism for our policies is presented and its soundness and precision is proven. Finally, we give evidence of practicality by implementing and evaluating the mechanism in a browser.