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- W4312585588 abstract "Forward-secure encryption (FSE) allows communicating parties to refresh their keys across epochs, in a way that compromising the current secret key leaves all prior encrypted communication secure. We investigate a novel dimension in the design of FSE schemes: fast-forwarding (FF). This refers to the ability of a stale communication party, that is “stuck” in an old epoch, to efficiently “catch up” to the newest state, and frequently arises in practice. While this dimension was not explicitly considered in prior work, we observe that one can augment prior FSEs—both in symmetric- and public-key settings—to support fast-forwarding which is sublinear in the number of epochs. However, the resulting schemes have disadvantages: the symmetric-key scheme is a security parameter slower than any conventional stream cipher, while the public-key scheme inherits the inefficiencies of the HIBE-based forward-secure PKE. To address these inefficiencies, we look at the common real-life situation which we call the bulletin board model, where communicating parties rely on some infrastructure—such as an application provider—to help them store and deliver ciphertexts to each other. We then define and construct FF-FSE in the bulletin board model, which addresses the above-mentioned disadvantages. In particular," @default.
- W4312585588 created "2023-01-05" @default.
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- W4312585588 date "2022-01-01" @default.
- W4312585588 modified "2023-09-24" @default.
- W4312585588 title "Forward-Secure Encryption with Fast Forwarding" @default.
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- W4312585588 doi "https://doi.org/10.1007/978-3-031-22365-5_1" @default.
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