Abstract
We present a construction of a private-key functional encryption scheme for any family of randomized functionalities based on any such scheme for deterministic functionalities that is sufficiently expressive. Instantiating our construction with existing schemes for deterministic functionalities, we obtain schemes for any family of randomized functionalities based on a variety of assumptions (including the LWE assumption, simple assumptions on multilinear maps, and even the existence of any one-way function) offering various trade-offs between security and efficiency. Previously, Goyal, Jain, Koppula and Sahai [TCC, 2015] constructed a public-key functional encryption scheme for any family of randomized functionalities based on indistinguishability obfuscation. One of the key insights underlying our work is that, in the privatekey setting, a sufficiently expressive functional encryption scheme may be appropriately utilized for implementing proof techniques that were so far implemented based on obfuscation assumptions (such as the punctured programming technique of Sahai and Waters [STOC, 2014]). We view this as a contribution of independent interest that may be found useful in other settings as well.
Original language | English |
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Title of host publication | Theory of Cryptography - 12th Theory of Cryptography Conference, TCC 2015, Proceedings |
Editors | Yevgeniy Dodis, Jesper Buus Nielsen |
Publisher | Springer Verlag |
Pages | 352-377 |
Number of pages | 26 |
ISBN (Electronic) | 9783662464960 |
DOIs | |
State | Published - 2015 |
Event | 12th Theory of Cryptography Conference, TCC 2015 - Warsaw, Poland Duration: 23 Mar 2015 → 25 Mar 2015 |
Publication series
Name | Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) |
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Volume | 9015 |
ISSN (Print) | 0302-9743 |
ISSN (Electronic) | 1611-3349 |
Conference
Conference | 12th Theory of Cryptography Conference, TCC 2015 |
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Country/Territory | Poland |
City | Warsaw |
Period | 23/03/15 → 25/03/15 |
Bibliographical note
Publisher Copyright:© International Association for Cryptologic Research 2015.