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  1. Proceedings of the 2006 workshop on Programming languages and analysis for security (PLAS '06)
  2. Trusted declassification:: high-level policy for a security-typed language
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Trusted declassification:: high-level policy for a security-typed language

Content Provider ACM Digital Library
Author King, Dave McDaniel, Patrick Hicks, Michael Hicks, Boniface
Abstract Security-typed languages promise to be a powerful tool with which provably secure software applications may be developed. Programs written in these languages enforce a strong, global policy of noninterferencewhich ensures that high-security data will not be observable on low-security channels. Because noninterference is typically too strong a property, most programs use some form of declassification to selectively leak high security information, e.g. when performing a password check or data encryption. Unfortunately, such a declassification is often expressed as an operation within a given program, rather than as part of a global policy, making reasoning about the security implications of a policy more difficult.In this paper, we propose a simple idea we call trusted declassification in which special declassifier functions are specified as part of the global policy. In particular, individual principals declaratively specify which declassifiers they trust so that all information flows implied by the policy can be reasoned about in absence of a particular program. We formalize our approach for a Java-like language and prove a modified form of noninterference which we call noninterference modulo trusted methods. We have implemented our approach as an extension to Jif and provide some of our experience using it to build a secure e-mail client.
Starting Page 65
Ending Page 74
Page Count 10
File Format PDF
ISBN 1595933743
DOI 10.1145/1134744.1134757
Language English
Publisher Association for Computing Machinery (ACM)
Publisher Date 2006-06-10
Publisher Place New York
Access Restriction Subscribed
Subject Keyword Information-flow control Fjifp Security-typed languages Jif Trusted declassification Declassification noninterference modolo trusted methods Security policy
Content Type Text
Resource Type Article
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