Fibre-optic cables may be used to eavesdrop up to 1km away, study says - Daily Mail

Fibre-optic cables are sensitive to changes in environmental pressure caused by acoustic waves, such as sound, say experts at Tsinghua University, Beijing.

Fibre-optic cables could be used to eavesdrop on people over half a mile away by detecting changes in light that occur when they speak, a new study shows.  Researchers in China have developed a syst… [+5535 chars]

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