Cables as messengers of information between computers are on their way out. A cableless computer network called WaveLAN, in which each computer is provided with an antenna that picks up data in the form of radiowaves, was launched recently in Britain (New Scientist, Vol 138, No 1874).
The new technology makes it impossible for hackers to "eavesdrop" on confidential data because of two in-built safeguards. The radio signals are encrypted so that only computers on the network can decode them. And, a unique identification code ensures that only computers using this code can communicate with each other.
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