Privacy activists have filed lawsuits against the collection of facial recognition data. Ordinary citizens and establishment intellectuals alike have pushed back against the abuse of Covid tracking apps by the authorities to curb protests. Internet users have shared tips on how to evade digital monitoring.

As China builds up its vast surveillance and security apparatus, it is running up against growing public unease about the lack of safeguards to prevent the theft or misuse of personal data. The ruling Communist Party is keenly aware of the cost to its credibility of any major security lapses: Last week, it moved systematically to squelch news about what was probably the largest known breach of a Chinese government computer system, involving the personal information of as many as one billion citizens.