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As Internet connectivity grows executing untrusted code becomes an increasingly serious threat. Public Key Infrastructure (PKI) and digital signatures offer some degree of protection, but are only part of a solution. In this paper the authors propose a mechanism of forcing applications to "Declare what they intend to do" by means of an abstract behavioural model. A monitoring process is employed to dynamically ensure that programs do not deviate from their pre-declared intention. They focus particularly on the usability, transparency and maintainability of the system, which they believe to have been lacking in similar efforts.
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