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Consider a protocol in which Belinda seals a (classical) message. She givesthe resulting sealed message to Charlie, who can either unseal and read themessage or return it unopened to Belinda. If he returns it unopened, Belindashould be able to verify that Charlie neither read the message nor made a copythat would allow him to read it later. Such a protocol is impossible withclassical cryptography: Charlie can copy a message and do anything he likes tothat copy without damaging the original. With quantum cryptography, on theother hand, the no cloning theorem implies that Charlie cannot simply copy amessage and unseal the copy.  Abstract In this paper, I prove that any conventional quantum cryptographicprotocol can give at best a very weak security guarantee. However, quantumcryptography in conjunction with classical functions that can only be invertedby humans (i.e. CAPTCHAs) can potentially give exponential security.

Sealed States And Quantum Blackmail