In the last ten years, computer security researchers have shown that malicious hackers don’t need to see your data in order to steal your data. From the pattern in which your computer accesses its memory banks, adversaries can infer a shocking amount about what’s stored there. The risk of such attacks is particularly acute in the cloud, where you have no control over whose applications are sharing server space with yours. An antagonist could load up multiple cloud servers with small programs that do nothing but spy on other people’s data. System for defending against memory-access attacks is being implemented in chips.