Secure Behavior of Web Browsers to Prevent Information Leakages

Recently Web browsers are widely used as client-side application platforms
beyond the traditional use of Web browsers.
One of main reasons for such evolution of the browsers is a client-side
JavaScript language that can execute programs embedded in a document.
However, Web applications with client-side JavaScript programs have problems
in leaking private information (such as cookie information)
due to interactions between a browser and scripts embedded in a document.
In order to prevent Web browsers from leaking information, we propose
a calculus representing browser behavior with considering information flows.
The proposed calculus can deal with script rewriting and higher-order functions.
In addition, our calculus has a noninterference property depending on a security
policy statically given by a user.

By: Takaaki Tateishi, Naoshi Tabuchi

Published in: RT0736 in 2007


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