Wi-Fi cracking cards sell well on Taobao

But company threatens to get tough with sellers who break website's trading rules

A special kind of wireless LAN card that allows users to tap into private Wi-Fi networks for free, continues to be available on Taobao, China's largest on-line shopping company, despite an ongoing ban.

The card, dubbed "cengwangka" by Chinese netizens, resembles a standard WLAN card but is installed with devices that crack the passwords of paid net subscribers. They are typically priced at between 120 and 150 yuan on Taobao.