In what may have been the largest data breach in Chinese history, a hacker claimed to have stolen from Shanghai police the personal information of one billion Chinese citizens. The information “about one billion Chinese national residents and several billion case records” was offered for sale in a post on the hacker forum Breach Forums for the price of 10 Bitcoin, or around $200,000. Using the alias ChinaDan, the poster said on Sunday that the data set contained “name, address, birthplace, national ID number, mobile number, and all crime/case records.” Although the post has not been validated, it has generated...