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Client software for modern service-oriented web architectures is often implemented as mobile code applets made available by service-providers. Protecting clients from malicious mobile code is therefore an important concern in these architectures; however, the burden of security enforcement is typically placed entirely on the client. This approach violates the service-oriented paradigm. A method of realizing mobile code security as a separate service in a service-oriented web architecture is proposed. The security service performs in-lined reference monitoring of untrusted Java binaries on-demand for client-specified security policies. An XML format for specifying these policies is outlined, and preliminary experiments demonstrate the feasibility of the approach.
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