Unclonable Cryptography: Achieving Security Against Unbounded Collusions and Exploring the Impossibility of Hyperefficient Shadow Tomography

This research introduces the first fully collusion-resistant copy-protection schemes for various cryptographic primitives, including public-key encryption, functional encryption, signatures, and pseudorandom functions, leveraging novel techniques like pseudorandom coset states and identity-based encryption, while also demonstrating the impossibility of hyperefficient quantum shadow tomography.