Inside Quantum Technology

Quantum Communication In Space Moves Ahead Via QKDSat

Illustration of a satellite orbiting the earth

(SpaceRef) Most of the world’s communications systems rely on public key infrastructure to establish keys that are used to encrypt communications between two distant points. These encryption keys are intended to ensure the confidentiality, integrity and authenticity of the information – but the infrastructure will become vulnerable to hackers using quantum computers.
QKDSat distributes symmetric keys through a cloud-based system to end-use devices, with a tiny computational load of less than 200 lines of code, leveraging the laws of quantum physics to prevent any eavesdropper from gaining access to the encryption key.
A series of QKDSat satellites will enable the exchange and distribution of secure encryption keys to countless locations and billions of devices anywhere in the world, thanks to their optical quantum space-to-ground link. This improves resilience to future hacking threats because the quantum keys are generated from high-quality random sources and distributed across the cloud network.
QKDSat is being developed as an ESA Partnership Project, which brings together the skills, expertise and resources of the agency to support the development of commercial applications of space technology in a public-private partnership.
In 2019 ESA has placed a contract with Arqit co-funding the development of the first QKDSat satellite. The development is progressing well and the satellite is due for launch in 2023.

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