Secret underwater messages can be hidden in whale and dolphin chatter

Secret underwater messages could possibly be camouflaged as the clicks and whistles of whale or dolphin calls, fooling eavesdroppers by making them believe they are hearing marine animals.

Marine mammal sounds make a difference military sonar systems, so they are generally deemed ocean noise and filtered out. This makes these animal signals a stealthy solution for communicating secretly underwater.

To test the theory, Chunyue Li and her colleagues at Tianjin University in China designed a method …

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