Kentaro Aburada

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Most existing authentication methods have a common problem, referred to as shoulder-surfing, in which authentication information is covertly obtained by peeking over the shoulder of a user as he/she completes the authentication sequence. In this paper, we propose a puzzle authentica-tion method that is very simple and sufficiently secure, even when the(More)
—In recent years, with the improvement of the high speed communication infrastructure, P2P content distribution systems have been attracting more attention. In a P2P content distribution system, the lack of a central management server provides the system its robustness. However, it also leads to problems in content reliability and accessibility. We propose(More)
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