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Injection attacks and their defense require a lot of creativity from attackers and secure system developers. Unfortunately, as attackers rely increasingly on systematic approaches to find and exploit vulnerability, developers rely on the traditional way of writing ad hoc checks in source code. This paper shows that security engineering to prevent injection attacks need not be ad hoc. It shows that protection can be introduced at different layers of a system by systematically applying general purpose security-oriented program transformations. These program transformations are automated so that they can be applied to new systems at design and implementation stages, and to existing ones during maintenance.
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