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- W1977728289 abstract "A timed-release cryptosystem allows a sender to encrypt a message so that only the intended recipient can read it only after a specified time. We formalize the concept of a secure timed-release public-key cryptosystem and show that, if a third party is relied upon to guarantee decryption after the specified date, this concept is equivalent to identity-based encryption; this explains the observation that all known constructions use identity-based encryption to achieve timed-release security. We then give several provably-secure constructions of timed-release encryption: a generic scheme based on any identity-based encryption scheme, and two more efficient schemes based on the existence of cryptographically admissible bilinear mappings. The first of these is essentially as efficient as the Boneh-Franklin Identity-Based encryption scheme, and is provably secure and authenticated in the random oracle model; the final scheme is not authenticated but is provably secure in the standard model (i.e., without random oracles)." @default.
- W1977728289 created "2016-06-24" @default.
- W1977728289 creator A5020203068 @default.
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- W1977728289 date "2008-03-01" @default.
- W1977728289 modified "2023-09-29" @default.
- W1977728289 title "Provably Secure Timed-Release Public Key Encryption" @default.
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- W1977728289 doi "https://doi.org/10.1145/1330332.1330336" @default.
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