### Revocable Quantum Timed-Release EncryptionRevocable Quantum Timed-Release Encryption

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 Author Unruh, Dominique Source ACM Digital Library Content type Text Publisher Association for Computing Machinery (ACM) File Format PDF Copyright Year ©2015 Language English
 Subject Domain (in DDC) Computer science, information & general works ♦ Data processing & computer science Subject Keyword Quantum cryptography ♦ Random oracles ♦ Timed-release encryption Abstract Timed-release encryption is a kind of encryption scheme in which a recipient can decrypt only after a specified amount of time $\textit{T}$ (assuming that we have a moderately precise estimate of his computing power). A $\textit{revocable}$ timed-release encryption is one where, before the time $\textit{T}$ is over, the sender can “give back” the timed-release encryption, provably loosing all access to the data. We show that revocable timed-release encryption without trusted parties is possible using quantum cryptography (while trivially impossible classically). Along the way, we develop two proof techniques in the quantum random oracle model that we believe may have applications also for other protocols. Finally, we also develop another new primitive, unknown recipient encryption, which allows us to send a message to an unknown/unspecified recipient over an insecure network in such a way that at most one recipient will get the message. ISSN 00045411 Age Range 18 to 22 years ♦ above 22 year Educational Use Research Education Level UG and PG Learning Resource Type Article Publisher Date 2015-12-10 Publisher Place New York e-ISSN 1557735X Journal Journal of the ACM (JACM) Volume Number 62 Issue Number 6 Page Count 76 Starting Page 1 Ending Page 76

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Source: ACM Digital Library