향상된 Multi Gray-Leveling을 통한 VoIP 스팸 탐지 기법

Abstract

In this paper, we propose an improved Multi Gray-Leveling scheme which reduces the problems of the existing Multi Gray-Leveling scheme suggested as a way of prevention against call spam in VoIP environment. The existing scheme having two different time period distinguishes the possibility of call spam by checking the call interval, so that it prevents the spammer`s avoidance controlling the call interval. This is the strength of the existing one but it can misunderstand the normal user as a spammer due to taking long term time period. To solve this problem, this paper proposes the upgrade scheme which utilizes the receiver`s action pattern as well as the caller`s action pattern. It has such a good strength that can do gray leveling via the collected information in the database of VoIP service provider without user`s direct involvement. Hence it can be a very effective way of VoIP spam detection.