Open Ubiquitous Networks Supporting Social Infrastructure

为了实现从真实的世界广泛收集数据的传感器网络，需要建立作为支持社会基础设施的开放的泛在网络的安全且高效的数据传送机制。在这项研究中，我们已经制定了必要的协议方面的安全性和效率。首先，我们已经开发了HAR作为一个安全的分组协议。HAR中假设的传感器网络由多个基站和其他数据收集节点组成。在HAR中，我们使用基站的公开密钥和秘密密钥以及数据收集节点的秘密密钥和组密钥。充当父节点的基站周期性地发送用组密钥加密的“用于搜索子节点的请求”，并且合法的传感器节点将通过向搜索子节点发送响应来回复这些请求。已经加入组的传感器节点成为新的父节点，从而继续这个过程以形成组。我们的模拟研究表明，一个安全可靠的组可以形成使用HAR。接下来，我们已经开发了SAMON，分层路由的计划，它保留了一对一的对应关系，以现实世界的坐标，针对现实世界的部署。SAMON使用可变长度的地址来适应分层路由，并且仅通过提取地址来实现隐式源路由。此外，我们已经实现了“Areacast”，这是相当于一个多播对应的物理位置。除了模拟，我们还进行了实验，在室外环境中，并已表明，我们的计划是有用的移动的用户在街道上，我们已经建立了一个开放的泛在网络的平台。对于我们未来的工作，我们将在更大规模的网络上工作，以追求可扩展性问题。

We need to establish a mechanism of secure and efficient data delivery as an open ubiquitous network supporting a social infrastructure in order to realize a sensor network of collecting data widely from the real world. In this research, we have developed necessary protocols with regard to security and efficiency. First, we have developed HAR as a secure grouping protocol. A sensor network assumed in the HAR consists of several base stations and other data-collecting nodes. In HAR, we use the public and secret keys of the base stations and the secret and group keys of the data-collecting nodes. A base station acting as a parent node periodically transmits "requests for searching children nodes" that are encrypted with a group key and legitimate sensor nodes will reply to these requests by sending responds to searching children nodes." The sensor node that has already joined a group becomes a new parent node, and thereby continuing this process to form a group. Our simulation study has shown that a secure and reliable group can be formed using HAR. Next, we have developed SAMON, a scheme of hierarchical routing which retains a one-to-one correspondence with the real-world coordinate aiming at the real-world deployment. SAMON uses variable-length addresses that accommodate hierarchical routing and realizes an implicit source routing merely by extracting the address. Furthermore, we have achieved "Areacast" which is equivalent to a multicast corresponding to physical locations. In addition to the simulations, we have also conducted experiments in the outdoor environments and have shown that our scheme is useful for mobile users in the streets and we have established a platform for open ubiquitous networks. For our future work, we will work on a larger scale network to pursue scalability issues.