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- W86486821 abstract "Functional encryption (FE) enables fine-grained access control of encrypted data while promising simplified key management. In the past few years substantial progress has been made on functional encryption and a weaker variant called predicate encryption. Unfortunately, fundamental impossibility results have been demonstrated for constructing FE schemes for general functions satisfying a simulation-based definition of security.We show how to use hardware tokens to overcome these impossibility results. In our envisioned scenario, an authority gives a hardware token and some cryptographic information to each authorized user; the user combines these to decrypt received ciphertexts. Our schemes rely on stateless tokens that are identical for all users. (Requiring a different token for each user trivializes the problem, and would be a barrier to practical deployment.) The tokens can implement relatively “lightweight” computation relative to the functions supported by the scheme.Our token-based approach can be extended to support hierarchal functional encryption, function privacy, and more." @default.
- W86486821 created "2016-06-24" @default.
- W86486821 creator A5030233265 @default.
- W86486821 creator A5053223081 @default.
- W86486821 creator A5056462104 @default.
- W86486821 date "2013-01-01" @default.
- W86486821 modified "2023-09-25" @default.
- W86486821 title "Functional Encryption from (Small) Hardware Tokens" @default.
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- W86486821 doi "https://doi.org/10.1007/978-3-642-42045-0_7" @default.
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