Kentaro Aburada

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—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)
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)
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