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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