Eitaro Kohno

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Recently, all over the world, crime against children is increasing at higher rates and it is high time to offer safety support system for the children going to schools. This paper focuses on implementing children tracking system for every child attending school. However the existing systems are not powerful enough to prevent the crime against children since(More)
We have been developing a New Generation Children Tracking System using Android terminals which is based on experiences and findings of the field experiments for the Hiroshima City Tracking System executed in 2007. In the developing System, Android terminals communicate with each other with Bluetooth and configure a Bluetooth MANET. Also, they configure(More)
For Wireless Sensor Networks (WSNs), a secret sharing scheme-based secure dispersed data transfer method has been proposed. While this method has resilience against node capture attacks, it is susceptible to node impersonation. We have already proposed an effective method for detecting impersonation attacks on source nodes. However, impersonation attacks on(More)
Video communication is being popular by spreading broadband networks. Realization of this kind of communications is important to deploy IPv6. However, many almost of commercial video conference systems do not work in IPv6 networks. We developed an application gateway called as "PTGATE" to extend available scenes of video conferences. PTGATE has three(More)
A Wireless Sensor Network has sensor nodes which have limited computational power and memory size. Due to the nature of the network, the data is vulnerable to attacks. Thus, maintaining confidentiality is an important issue. To compensate for this problem, there are many countermeasures which utilize common or public key cryptosystems that have been(More)
In recent years, ad hoc networks have attracted a great deal of attention. Ad hoc networks consist of nodes with wireless communication devices without any base stations or fixed infrastructures. Most routing protocols of ad hoc networks form a single-path. Single-path routing protocols need to repair routes each time the route has broken. This route repair(More)