Type-Based Security for Mobile Computing: Integrity, Secrecy and Liveness

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Nowadays the use of mobile code is widespread through computing scenes, e.g. in www and telephony applications. One of benefits of mobile code is to allow extensibility, where a piece of code migrates from a source node to a target node and gets linked to the run-time environment of the target to serve its purpose. Such an open characteristic of mobile computing introduces the main security issues: access control, privacy of data (secrecy), and availability. However, current systems and programming languages lack a theoretical base to identify and detect potentially malicious mobile software. This research proposal develops fundamental technologies to solve three security issues concerning mobile programs using well-defined mathematical models, typed calculi of mobile processes, and applies them to a mobile language design.First we develop a uniform framework for the various programming languages which can ensure liveness and secrecy based on a concurrent process calculus, called the pi-calculus. Then we extend its theory to mobility using the higher-order pi-calculus, as well as incorporating the access control. Finally we demonstrate the relevance of these foundational theories by applying them to the real software development by designing a mobile programming language and its type system which can ensure integrity, secrecy and liveness. The correctness of the type system is proved via translation into mobile processes.