A new quantum cryptography scheme could enable unforgeable one-time signatures, and quantum money

[AntMan]

A genuinely futuristic piece of cryptography research landed this week. QPerfect and BTQ Technologies say they have engineered the first circuit level One Shot Signature scheme, bridging the gap between the cryptographic theory and something that can actually run as executable quantum circuits, using a framework they describe as local quantum cryptography

The mechanism is exotic, a quantum key generation and signing process that exploits quantum mechanics so a signature can only be used a single time, wrapped in dual layered program obfuscation for security. The claimed applications read like science fiction, trustless random beacons, secured one time token transfers, and the long theorised idea of genuine quantum money that physically cannot be copied

The context is that most quantum security news is defensive, everyone racing to post quantum encryption before a future machine breaks today's cryptography. This is the opposite, using quantum properties to build capabilities that are simply impossible classically, which is a more optimistic and much less discussed side of the same coin

So the discussion. Is offensive quantum cryptography, building genuinely new unforgeable primitives, a more exciting frontier than the defensive scramble to quantum proof our existing systems, or is this the kind of theoretically beautiful result that stays trapped in the lab for a decade because it needs fault tolerant hardware that does not yet exist?

News - Quantum Computing Reportquantumcomputingreport.com

[BrokenDave72]

Quantum money that physically cannot be copied is one of those ideas that sounds like nonsense until you understand the physics, the no cloning theorem makes it genuinely possible in a way no classical system can match, real magic