|A police officer in a protective suit checks on a commuter at a subway station, after the lockdown placed to curb the coronavirus disease (COVID-19) outbreak was lifted in Shanghai, China June 2, 2022. (File Photo by=REUTERS/Aly Song)| SHANGHAI: A hacker has claimed to have procured a trove of personal information from the Shanghai police on 1 billion Chinese citizens, which tech experts say, if true, would be one of the biggest data breaches in history, Reuters reported. The anonymous Internet user, identified as ChinaDan, posted on the hacker forum Breach Forums last week offering to sell more than 23…