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The vision of ubiquitous computing presents us with unique difficulties in terms of maintaining security. Many of these relate to privacy or quality of service issues, but underpinning these is the requirement for secure execution of code. We present a novel framework for utilising a hybrid method of code analysis combined with component composition techniques. The aim has been to allow sandboxing techniques to maintain security dynamically in a ubiquitous computing environment. We argue that whilst security issues for ubiquitous computing are particularly acute, characteristics of the environment can also be harnessed advantageously to fulfil these security requirements.