Using Device Linking to Eavesdrop on WhatsApp and Signal

· Bruce Schneier · Sept. 29, 2026, 11:06 a.m.
Eavesdropping law enforcement police privacy Security messaging apps law enforcement
Summary
The blog post discusses how modern messaging apps like WhatsApp and Signal, which allow users to link accounts to desktops, can be exploited by eavesdroppers, particularly by law enforcement in Germany, to access messages without breaching encryption. It highlights methods used by police to connect to suspect accounts, including physical access and phishing attacks.
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