I rather like this new take on steganography:
Secret underwater messages could 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 can affect military sonar systems, so they are usually deemed ocean noise and filtered out. This makes these animal signals a stealthy solution for communicating secretly underwater. …
Mimicking marine mammals to communicate underwater isn’t a new idea. But previous approaches mainly used artificial sounds that imitate animals and focused on just one type of call – either clicks or whistles – limiting their camouflage potential. Since many whales and dolphins live in groups, their calls naturally overlap. If someone heard only one kind of call in isolation it would raise suspicions. [NewScientist (7 August 2021)]
Artificial Intelligence is used to filter whale song from underwater noises, so if you can fool it you’re safe.
It’s cool.
