Classical cryptography system uses giant lasers to boost security

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This graph compares the speed it takes for establishing secret keys in a both a quantum key distribution system and the new giant fiber laser system. As the distance increases to more than 48 km the classical laser system demonstrates its advantages ...
This graph compares the speed it takes for establishing secret keys in a both a quantum key distribution system and the new giant fiber laser system. As the distance increases to more than 48 km, the classical laser system demonstrates its advantages, especially at longer distances. Credit: Scheuer and Yariv.

It's been more than 20 years since quantum cryptography systems have been developed, taking over communication security from classical cryptography systems--the kind that used extremely difficult mathematical equations. Now, however, scientists Jacob Scheuer and Amnon Yariv have designed a new kind of classical key distribution system using ultra-long lasers that overcomes the practical challenges faced by quantum systems with its realistic simplicity and symmetry.


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