Method and system for spacetime-constrained oblivious transfer

This invention describes a highly secure method for two parties to exchange information, where one party can select a single message from a group without the other party knowing which message was chosen, and without receiving any other messages. It achieves this by combining quantum communication with strict adherence to relativistic principles, such as the speed of light, to guarantee security. The claims specify that all participants must be precisely synchronized to a common reference frame and that message selection and delivery occur within specific spacetime regions defined by causal pasts.

Why it matters: Filed when quantum computing and communication were largely theoretical, significant advancements in quantum hardware and networking since 2017 make the quantum aspects of this system more conceivable. However, the practical implementation of cryptographic protocols relying on precise relativistic constraints remains an extremely difficult engineering challenge.

Status: Not in forceListed as no longer active. The specific reason is not in the record we hold.
How hard to build: SpecializedQuantum communication hardware, precise relativistic timing

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