ESA To Adopt Controversial Quantum Key Distribution For Satellite Communications

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bit_user

Splendid
Herald

I'm slightly confused, here. As the name suggests, I thought the idea was only to send the key through the quantum channel. The message would be sent normally, but requires the key in order to be decrypted. I assume the reason for doing it this way is that the quantum channel is lower-bandwidth and/or overuse could cause entanglement to be lost much sooner.

I'm also curious about the side-channel attacks. Is the idea that the radar array would be used to spy on the end-point device? Somewhat akin to peering though the window at a spy, while they're in the act of decoding & reading a secret message?
 
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