4 ms·
Interesting, but it seems like if an attacker could guess the target quasar and time (a much smaller search space perhaps than the general space of random strin
by manifestsilence 7y ago
Interesting, but it seems like if an attacker could guess the target quasar and time (a much smaller search space perhaps than the general space of random strings), they could use their own database of quasar blips to crack the one-time pad. It's basically a public source of randomness, which seems like it makes it inherently not suitable for cryptography.
- sandworm101 7y agoWell, it isn't as simple as light levels or color. The randomness would come from measuring aspects of individual photons, things that could not be shared between telescopes. If you want to measure something like entanglement, you want a source of randomness totally divorced from any local influence. Nobody can argue that photons formed in a star millions of years away could possibly have been influenced by local forces. Use two quasars separated by 180* (ie on opposite sides of sky) and you could definitively say that, given the speed of light, the incoming photons could not possibly have interacted with each other before being measured.