NDLI: A Definitional Framework for Functional Encryption

Content Provider	IEEE Xplore Digital Library
Author	Matt, C. Maurer, U.
Copyright Year	2015
Description	Author affiliation: Dept. of Comput. Sci., ETH Zurich, Zurich, Switzerland (Matt, C.; Maurer, U.)
Abstract	Functional encryption (FE) is a powerful generalization of various types of encryption. We investigate how FE can be used by a trusted authority to enforce access-control policies to data stored in an untrusted repository. Intuitively, if (functionally) encrypted data items are put in a publicly-readable repository, the effect of the encryption should be that every user has access to exactly (and only) those functions of the data items for which he has previously received the corresponding decryption key. That is, in an ideal-world view, the key authority can flexibly manage read access of users to the repository. This appears to be exactly what FE is supposed to achieve, and most natural applications of FE can be understood as specific uses of such a repository with access control. However, quite surprisingly, it is unclear whether known security definitions actually achieve this goal and hence whether known FE schemes can be used in such an application. In fact, there seems to be agreement in the cryptographic community that identifying the right security definitions for FE remains open. To resolve this problem, we treat FE in the constructive cryptography framework and propose a new conventional security definition, called composable functional encryption security (CFE-security), which exactly matches the described ideal-world interpretation. This definition (and hence the described application) is shown to be unachievable in the standard model but achievable in the random oracle model. Moreover, somewhat weaker definitions, which are achievable in the standard model, can be obtained by certain operational restrictions of the ideal-world repository, making explicit how schemes satisfying such a definition can (and cannot) meaningfully be used. Finally, adequate security definitions for generalizations of FE (such as multi-input, randomized functions, malicious cipher text generation, etc.) can be obtained by straight-forward operational extensions of the repository and extracting the corresponding security definitions. This leads towards a unified treatment of the security of FE.
Starting Page	217
Ending Page	231
File Size	343831
Page Count	15
File Format	PDF
ISSN	10636900
e-ISBN	9781467375382
DOI	10.1109/CSF.2015.22
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-07-13
Publisher Place	Italy
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Protocols Public key Iron Encryption Electronic mail
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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