Sgx enabled functional encryption and applications. Multiinput functional encryption can apply to this example. Multiinput functional encryption without obfuscation. Joint work with alex malozemoff, daniel apon, brent carmer, adam foltzer, daniel wagner, david archer, dan boneh, jonathan katz, and mariana raykova. From singleinput to multiinput functional encryption in the. We will talk about recent advances on multiinput function encryption, an emerging cryptographic paradigm that allows finegrained access control over encrypted data. In this paper we initiate a systematic study of mmapbased constructions. In particular, we extend the 5gen framework ccs 2016 to support circuitbased mife and program obfuscation.
In this work, we explore in detail cryptographic program obfuscation and the related primitive of multi input functional encryption mife. We initiate a systematic study of mmapbased constructions, building a general framework, called 5gen, to experiment with program obfuscation and multi input functional encryption. Ilan komargodski, gil segev and eylon yogev functional encryption for randomized functionalities in the privatekey setting from minimal assumptions. High con dence software and systems conference invited talk, may 2017 secure computation of mips machine code workshop on cryptography for the ram model of computation. Eurocrypt 2014 show various applications of mife to running sql queries over encrypted databases. We formulate both indistinguishabilitybased and simulationbased definitions of security for this notion, and show close connections with indistinguishability and virtual blackbox definitions of obfuscation. Bibliographic content of iacr cryptology eprint archive, volume 20. Sign up repository for building and running applications of multilinear maps, which include multiinput functional encryption mife and obfuscation. In proceedings of the 34th annual international conference on the theory and applications of cryptographic techniques eurocrypt 2015 dan. Saikrishna badrinarayanan, eric miles, amit sahai, mark zhandry. Functional encryption is about providing a computable circuit obfuscated with io which receives as input encrypted versions of some value x, and returns fx for some function f, without revealing anything else. In our setting, there are an unbounded number of possible clients, each of which gets a. Our construction works for any polynomial number of encryption slots and achieves adaptive security against unbounded collusion, while relying on standard polynomial hardness assumptions. Fast software encryption fse 2020 will take place in athens, greece in march 2226.
Provable security of tweakable block ciphers based on substitutionpermutation networks benoit cogliati university of luxembourg, luxembourg, yevgeniy dodis nyu, jonathan katz university of maryland, jooyoung lee kaist, john steinberger, aishwarya thiruvengadam ucsb, zhe zhang tsinghua university. Generalpurpose multiinput functional encryption gggjklssz14, bv15, aj15 powerful cryptographic primitive that fully subsumes ore achieves bestpossible security impractical requires obfuscating a prf. From single input to multi input functional encryption in the privatekey setting zvika brakerski ilan komargodskiy gil segevz abstract we construct a generalpurpose multi input functional encryption scheme in the privatekey setting. Eurocrypt14 as a means to noninteractively compute aggregate information on the joint private data of multiple users. The notion of multiinput functional encryption mife was recently introduced by goldwasser et al. We present a multi input functional encryption scheme mife for the inner product functionality based on the klin assumption in primeorder bilinear groups. Ytmx580 multiinput temperature transmitter yokogawa. Dov gordon, vipul goyal, abhishek jain, fenghao liu, amit sahai, elaine shi, and hongsheng zhou eurocrypt 2014 this publication is the result of a merge with this paper verifiable oblivious storage, with daniel apon, elaine shi, and aishwarya thiruvengadam. Multiinput innerproduct functional encryption from pairings.
Secure internet of things project sitp publications. Multiinput functional encryption microsoft research. The following block quote and fps example are taken from the answer linked. Taking as an example the paper multiinput functional encryption, a key is hardwired in the description of the key generation scheme. A mife scheme has several encryption slots and each decryption key sk ffor a multiinput function fdecrypts jointly ciphertexts encx 1, encx n for all slots to obtain fx 1. Dovgordon2,vipulgoyal3,abhishekjain4, jonathankatz 5,fenghaoliu,amitsahai7,elaineshi5, andhong. Hardwired secret key in public private key encryption. We will talk about recent advances on multi input function encryption, an emerging cryptographic paradigm that allows finegrained access control over encrypted data. Now, if we give the secret key sk f and the encryption key ek 1. A fundamental limitation of their work, however, is that the total number of users which corresponds to the arity of the functions supported by. In particular, we extend the 5gen framework ccs 2016 to support circuitbased mife and program obfuscation, implementing both existing and new constructions. Zvika brakerski, ilan komargodski and gil segev multi input functional encryption in the privatekey setting. Multiinput functional encryption for unbounded arity functions. Multiinput functional encryption and program obfuscation for arithmetic circuits brent carmer oregon state universitygalois, inc.
Multi party key exchange for unbounded parties from indistinguishability obfuscation. The notion of multi input functional encryption mife was recently introduced by goldwasser et al. In terms of functionality, their schemes are extremely expressive, supporting all multiinput functions that are computable by boundedsize circuits. Multiinput innerproduct functional encryption from. Multiinput functional encryption, with shafi goldwasser, s. Multiinput functional encryption with unboundedmessage. We initiate a systematic study of mmapbased constructions, building a general framework, called 5gen, to experiment with program obfuscation and multiinput functional encryption. Ytmx580 multiinput temperature transmitter ytmx580 can accept inputs from up to 8 points of measurement such as thermocouples 8 types. In many known constructions of fe schemes, security is guaranteed only for messages that are fixed ahead of time i. Recently, more progressive approaches such as multiinput functional encryption 19, functional encryption using intel sgx 39 and practical implementation 18, 25 have been proposed.
Extending functional encryption to address the multiinput setting is the focus of this work. Multiinput functional encryption for unbounded arity. Multi input functional encryption for unbounded arity functions. Sep 11, 2017 multi input inner product functional encryption from pairings. In an fe scheme, secret keys tokens correspond to functions. Namely, we construct a scheme where a functional key corresponding to a function f enables a user holding. Stronger security from weaker assumptions journal of cryptology, 2018. In a functional encryption fe scheme, the owner of the secret key can generate restricted decryption keys that allow users to learn specific functions of the encrypted messages and nothing else. Functional encryption is about providing a computable circuit obfuscated with io which receives as input encrypted versions of some value x, and returns fx for some function f, without revealing anything else about x.
Zvika brakerski, ilan komargodski and gil segev multiinput functional encryption in the privatekey setting. Hosting services on an untrusted cloud stanford university. Multiinput functional encryption for inner products. Fulldomain hash hsw separation results for circular security krw,mo functional witness encryption bcp. A fundamental limitation of their work, however, is that the total number of users which corresponds to the arity of the. Eurocrypt 2014 as a compelling extension of functional encryption. We present new constructions of multiinput functional encryption mife schemes for the innerproduct functionality that improve the state of the art solution of abdalla et al. Practical orderrevealing encryption with limited leakage. In terms of security, however, their privatekey scheme satis es a weak selective notion, which does. Multi input functional is a very general tool for computing on encrypting data, which allows for mining aggregate information from several di erent data sources rather than just a single source as in single input functional encryption. Newest functionalencryption questions cryptography. Recently, more progressive approaches such as multi input functional encryption 19, functional encryption using intel sgx 39 and practical implementation 18, 25 have been proposed. Let us begin by clarifying the setting of multiinput functional encryption.
International conference on the theory and application of cryptology and information security. Multiparty key exchange for unbounded parties from indistinguishability obfuscation. Nevertheless, mife does not directly apply to our scenario. Secure multilinear maps mmaps have been shown to have remarkable applications in cryptography, such as program obfuscation and multiinput functional encryption mife. We introduce the problem of multi input functional encryption, where a secret key sk f can correspond to an nary function f that takes multiple ciphertexts as input. Professional software development environments usually provide a debugger, which helps programmers to locate and fix faults unfortunately, physical computing does not have analogous support tools and thus it was sometimes difficult for participants in our study to identify what the problem was. Taking as an example the paper multi input functional encryption, a key is hardwired in the description of the key generation scheme. 2 intel sgx background intel software guard extensions sgx mab+ is a set of processor extensions to intels x86 design.
Jain, abhishek johns hopkins whiting school of engineering. Multi input functional encryption mife introduced by goldwasser et al. Previous constructions of multiinput functional encryption schemes either relied on somewhat stronger assumptions and provided weaker security guarantees goldwasser et al. Multiinput functional encryption alice m1 bob carol gm1,m2 goldwasser, gordon, goyal, jain, katz, liu, sahai, shi, zhou 14 dave m2 pk setup msk keygen sk f skg fm1,m2. Multi input functional encryption for unbounded arity functions, asiacrypt 2015, 2015. Eurocrypt 2014 show various applications of mife to running sql queries over encrypted databases, computing over encrypted.
To date, there has been little evaluation of the performance of these applications. Multi input functional encryption mife was introduced by goldwasser et al. Application of multi input functional encryption to iot cloud security. Multi input functional encryption for inner products function hiding. Goldwasser s, gordon sd, goyal v, jain a, katz j, liu f, sahai a, shi e, zhou h 2014. Multi input functional encryption alice m1 bob carol gm1,m2 goldwasser, gordon, goyal, jain, katz, liu, sahai, shi, zhou 14 dave m2 pk setup msk keygen sk f skg fm1,m2. Earlybird registration is open until february 26 and the detailed program will be out soon. A mife scheme has several encryption slots and each decryption key sk ffor a multi input function fdecrypts jointly ciphertexts encx 1, encx n for all slots to obtain fx 1.
Adaptively secure puncturable pseudorandom functions in the standard. Multi input functional encryption, with shafi goldwasser, s. Jun 06, 2019 multi input functional encryption for unbounded arity functions. Fulldomain hash hsw separation results for circular security krw,mo. Multi input functional encryption and program obfuscation for arithmetic circuits brent carmer oregon state universitygalois, inc. We also focus on adding new features that make functional encryption more relevant to practical scenarios, such as multiinput functional encryption, where encryption is split among di. We present a multiinput functional encryption scheme mife for the inner product functionality based on the klin assumption in primeorder bilinear groups. Multiinput functional encryption mife was introduced by goldwasser et al. Multiinput functional encryption for unbounded arity functions, asiacrypt 2015, 2015. We formulate both indistinguishabilitybased and simulationbased definitions of security for this notion, and show close connections with indistinguishability and virtual black. Deniable encryption sw multiinput functional encryption gggjklssz14 functional encryption for randomized functions gjks noninteractive multiparty key exchange bz, abgsz removing random oracles. Newest functionalencryption questions cryptography stack. Multiinput functional encryption in the privatekey.
Functional encryption supporting recursive languages. Improved construction for inner product functional encryption. In mife, a receiver is able to compute a joint function of multiple, independently encrypted plaintexts. Functional encryption is a type of publickey encryption, where the party that has access to a secret key can learn a function from that key, which is used to encrypt and decrypt messages. We also give techniques to decentralize the generation of functional decryption keys, and the setup of the functional encryption. In terms of security, however, their privatekey scheme satis es a weak selective notion, which does not. Multi input functional encryption can apply to this example. Functional encryption fe is a vast new paradigm for encryption scheme which allows tremendous flexibility in accessing encrypted data. Let us begin by clarifying the setting of multi input functional encryption. Previous constructions of multi input functional encryption schemes either relied on somewhat stronger assumptions and provided weaker security guarantees goldwasser et al. In this work, we explore in detail cryptographic program obfuscation and the related primitive of multiinput functional encryption mife.
Is this technique related to encryption schemes or it is a form of circuit construction. Broadcast encryption and traitor tracing bz,abgsz deniable encryption sw multi input functional encryption gggjklssz14 functional encryption for randomized functions gjks noninteractive multiparty key exchange bz, abgsz removing random oracles. Multiinput functional is a very general tool for computing on encrypting data, which allows for mining aggregate information from several di erent data sources rather than just a single source as in single input functional encryption. We introduce the problem of multiinput functional encryption, where a secret key sk f can correspond to an nary function f that takes multiple ciphertexts as input. To register to the conference and find information concerning the venue please visit fse 2020 webpage. In this paper we present a construction for secretkey multi input functional encryption from multilinear maps. Their software often uses three or more programming languages. Multiinput functional encryption mife introduced by goldwasser et al. Dov gordon jonathan katzy fenghao liuz elaine shix hongsheng zhouabstract functional encryption fe is a powerful primitive enabling.
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