Quantum-level cryptography for delegated digital signatures

This invention describes a system for creating highly secure digital signatures that can be delegated from one person to another, making them impossible to copy or fake. It proposes using quantum physics by entangling at least four quantum particles, with each particle assigned to a different participant in the signature process. These participants then perform specific quantum measurements to verify the signature's authenticity and ensure it cannot be denied later.

Why it matters: Filed in 2021, the fundamental challenge of building and deploying distributed quantum entanglement systems for practical cryptographic applications remains largely unchanged. While quantum research progresses, the necessary hardware for this multi-party scheme is still far from commercial viability outside of highly controlled lab environments.

Status: Not in forceListed as no longer active. The specific reason is not in the record we hold.
How hard to build: SpecializedQuantum hardware, entanglement, Bell State measurements

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