Yahoo Japan Corp. started posting on its Web site Wednesday the family names and bank account numbers of people who have repeatedly engaged in fraudulent and other illicit transactions on its auction sites.

The firm, Japan’s top Internet portal, identified about 100 accounts of people who, using Yahoo IDs, have allegedly engaged in illegal practices, including failing to send products that have been paid for by successful bidders.

It became the first Internet portal in the country to identify the bank accounts of people allegedly engaged in illegal practices on auction sites in a bid to increase the security of online transactions.

Yahoo Japan wants to make its Net auction corner into a more reliable marketplace where auction participants can engage in deals without the possibility of being victimized by fraud, company officials said.

In the past, the firm took away Yahoo IDs from people found to have engaged in such activities. This proved ineffective, however, as people can easily sign up for new ones.

The company found that, even after changing their IDs, these sellers would often still use the same bank account information to receive payments.

Therefore, it decided to identify their family names, bank names, branch names and account numbers, enabling Net bidders to verify the reliability of sellers, the officials said.

Yahoo will continue updating the list.

The step follows October’s antifraud measure under which Yahoo Japan began disseminating information on fraudulent transaction cases via e-mail sent to Net auction participants.

Starting in November, the company began divulging the names of people arrested on suspicions of fraud or other illegal Net deals.

According to the National Police Agency, the number of cases involving illegal Internet transactions rose 38.9 percent to 443 in the first half of 2002 from the same period the year before.

The total included 59 cases of fraud, an 11.3 percent increase from a year earlier.

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