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Using an indirect event service instead of other traditional communication models has an advantage of decreasing the coupling of applications in a distributed environment and removing the need for many static dependencies. In this paper, we design and implement the secure event service for providing a secure ubiquitous computing environment. The Secure Event Service implemented in this paper enables users to perform content-based event retrieval, and supports only eligible event consumer and event producer to publish and receive events through the secure event service. The SPKI/SDSI certificate is used for supporting authentication and authorization in the secure event service. In order to provide content-based event retrieval, an asynchronous communication between event producers and consumers, and a disconnectedness support for mobile devices, we modify and expand the JavaSpace package. [ABSTRACT FROM AUTHOR]