Unclonable Cryptography with Unbounded Collusions

ePrint Report: Unclonable Cryptography with Unbounded Collusions

Alper Çakan, Vipul Goyal

Quantum no-cloning theorem gives rise to the intriguing possibility of quantum copy protection where we encode a program in a quantum state such that a user in possession of $k$ such states cannot create $k+1$ working copies. Introduced by Aaronson (CCC'09) over a decade ago, copy protection has proven to be notoriously hard to achieve.


In this work, we construct public-key encryption and functional encryption schemes whose secret keys …

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