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as well as a variety of communication environment using the present communication network. Thus, it is required to investigate the authentication techniques for safer access control considering the access device. This paper proposed the authentication technique guaranteeing the security against existing attack techniques using OPT server as well as the authentication server using OPT value generated on a user's side. The proposed authentication technique will realize safe service anddoi:10.14257/astl.2014.51.41 fatcat:ejfasz4ipbbqjdxbtvqw3ppd3u