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Operation Trojan Shield (stylized TRØJAN SHIELD), part of Operation Ironside, was a collaboration by law enforcement agencies from several countries, running between 2018 and 2021. It was a sting operation that intercepted millions of messages sent through the supposedly secure smartphone-based proprietary messaging app ANOM (also stylized as AN0M or ΛNØM). The ANOM service was widely used by criminals, but instead of providing secure communication, it was actually a trojan horse covertly distributed by the United States Federal Bureau of Investigation (FBI) and the Australian Federal Police (AFP), enabling them to monitor all communications.