期刊名称：International Journal of Computer Trends and Technology
电子版ISSN：2231-2803
出版年度：2011
卷号：2
期号：1
出版社：Seventh Sense Research Group
摘要：Computer security and certain aspects of cyber crime is beeing increasing day by day. The detailed study of the present day most commonly encountered cyber crime like Credit card fraud analysis is presented in this paper . The model reported in this paper is based on Hidden Markov Model(HMM), is a markov chain for which the state is only partially observable. In HMM model , We quantize the purchase values x into M price ranges V1; V2; . . . VM, forming the observation symbols at the issuing bank. The actual price range for each symbol is configurable based on the spending habit of individual cardholders. These price ranges can be determined dynamically by applying a clustering algorithm on the values of each cardholder’s transactions, In this work, we consider only three price ranges, namely, low (l), medium (m), and high(h). Our set of observation symbols is, therefore, V ¼ fl; m; hg making M ¼ 3. Keywords Computer Security, Cyber Crime, Credit Card, HMM model.
关键词：Computer Security; Cyber Crime; Credit Card; HMM model
