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Sensitive and confidential data protection grows to hot and important in many different fields, such as electronic commerce, auctions, voting, and so on. In this area, information flow analysis is a powerful technique for reasoning about how much sensitive information is exposed by a program during execution. Existing approaches to information flow analysis can be broadly classified into two: qualitative and quantitative approach. Qualitative information flow analysis, such as taint tracking, are coarse-grained - often only distinguishing between possible leakage and no leakage.
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