"Secure Communication With Light Particles"

Although quantum computers offer a number of novel possibilities, they pose a threat to Internet security because they are expected to render current encryption methods obsolete. Therefore, researchers at TU Darmstadt have created a new tap-proof communication network based on quantum key distribution. The new system allows parties to exchange symmetric keys in order to encrypt messages so that third parties cannot read them. The researchers were successful in operating a quantum network that is both scalable in terms of user count and robust in the absence of trusted nodes. Such systems could protect critical infrastructure from the growing threat of cyberattacks in the future. Tap-proof connections could also be installed between various government sites in larger cities. The Darmstadt researchers' system enables quantum key exchange, which provides a common random number to multiple parties in a star-shaped network. Individual light quanta, known as photons, are distributed to the users in the communication network to compute the random number and thus the digital key. These keys are especially secure because of quantum physical effects. Communication is well-protected in this manner, and existing eavesdropping attacks can be detected. This article continues to discuss the new tap-proof communication developed by Darmstadt researchers based on quantum key distribution. 

TU Darmstadt reports "Secure Communication With Light Particles"