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An asymmetric secret sharing scheme (A-SSS) can set the number of data servers that hold shares to less than k because it can generate up to k – 1 shares from one key of the secret's owner. Therefore, the secret is not revealed even if all the data servers are attacked. However, if the owner's key is stolen and attacked, the secret may be leaked. Therefore, in this paper, we propose two proactive...
We present a new recording protection system for network connected devices that belong to a user's personal network. To avoid illegal redistribution of the recorded contents through Internet, a proper content protection technology is required. However, conventional recording protection systems all lack sharing of the recorded contents without an online connection to a remote content service. Our recording...
On large scale disasters, such as the Eastern Japan Great Earthquake and Kumamoto Earthquake, due to mud slides of cliff and floodwater of rivers, many disaster areas are physically isolated and relief and support activities of victims become quite difficult. The communication means are also destructed in those areas and cannot transmit the disaster information. In order to resolve those problems,...
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