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It is difficult to get the decision about an opinion after many users get the meeting in same place. It used to spend too much time in order to find solve some problem because of the various opinions of each other. TAmI (group decision making toolkit) is the system to group decision in ambient intelligence (C.F. Freitas et al, 2007).. This program was composed with IGATA (H.K. Park et al., 2005),...
While a lot of important information is being sent and received on the Internet, the information could be exposed to many threats, and the more the multicast service is various and generalized, the more the service range is widened. When a new member joins in or leaves from the multicast group, the group key, which the existing member used, should be newly updated. The existing method had a problem...
As the use of the computer and networks generalized, the various tasks which are requested secrets can be processed such as the banking transaction. And because of increasing of data exchange, Internet, and mobile networks, the method which is not connected only but also used with many users has been changed. Especially because of the structural problem of the Internet, a lot of information is leaked...
Recently there are a number of problems with security in the Internet when mobile IP environment is using. There are tampering unlawfully, overhearing, identity camouflage, re-transmission and etc what are the serious minatory factors in Internet communication. Confidentiality, integrity and authentication service is one of the most important information protection service among these minatory factors...
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