... fraud was dramatically increased, from$17 million in 2001 to $54 million in 2002, with a median dollar loss of $299 per complaint. (IFCC 2002 Internet Fraud Report [EPA], 2002) Overview In addition, it is believed that a lot of fraudulent cases are still not reported to law enforcement agencies, which makes exact numbers impossible to calculate. According to numerous reports and studies, there is a strong positive correlation between the sales amount of online market and the security of transferring transaction data. In order to keep on-line sales thriving, security of transaction is the most important issue in Internet era. According to the Federal Trade Commission's figures, ID theft is the most popular form of consumer fraud, in part because it is the most profitable. As long as someone's personal data is stolen, unauthorized buying as well as fraudulent selling behaviors will be easily made and intentionally ...

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