Open Ubiquitous Networks Supporting Social Infrastructure

为了实现广泛采集现实世界数据的传感器网络，我们需要建立一个安全高效的数据传输机制，作为一个开放的无处不在的网络来支持社会基础设施。在这项研究中，我们制定了关于安全性和效率的必要协议。首先，我们开发了HAR作为安全分组协议。HAR中假设的传感器网络由几个基站和其他数据收集节点组成。在HAR中，我们使用基站的公钥和私钥以及数据收集节点的私钥和组密钥。作为父节点的基站定期发送“搜索子节点的请求”，这些请求用组密钥加密，合法的传感器节点将通过向搜索子节点发送响应来响应这些请求。已经加入组的传感器节点成为新的父节点，从而继续此过程以形成组。我们的仿真研究表明，使用HAR可以形成一个安全可靠的群组。接下来，我们开发了SAMON，这是一种分层路由方案，它与针对实际部署的实际坐标保持一对一的对应关系。SAMON使用可变长度的地址来适应分层路由，并且仅仅通过提取地址来实现隐式的源路由。此外，我们还实现了“区域广播”，相当于物理位置对应的多播。除了模拟之外，我们还在室外环境中进行了实验，结果表明我们的方案对于街道上的移动用户是有用的，并且我们建立了一个开放的泛在网络平台。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.