Nuttapong (Nuts) Attrapadung CPSEC symposium

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Transkrypt:

Nuttapong (Nuts) Attrapadung CPSEC symposium 2018.12.17

On Cryptography Platform: Attribute-based Encryption and More Nuttapong (Nuts) Attrapadung CPSEC symposium 2018.12.17

About Myself Nuttapong Attrapadung (Nut/Nuts/Nattsu/) 1997-2001 Thailand 2001-2007 Japan 2007-now Japan 1997 Argentina Chulalongkorn University Bachelor Engineering University of Tokyo Master, Ph.D. (Info.Science&Tech) AIST researcher International Math Olympiad 2012-2013 France École normale supérieure, Paris visiting researcher

暗号プラットフォーム研究チームの紹介 他チーム@ 共同研究先 三菱電機 パナソニック NTT 日立 KDDI研究所 ナッツ 村上 照屋 須崎 塚本 外部企業 機関 設計した汎用的フレームワークの中 で ニーズに沿った応用機能を提供 本研究チーム 暗号技術を応用し システムの様々なレイヤ でセキュアプラットフォーム フレームワークを設計 開発 研究プロジェクト JST CREST Kakenhi JST ACT-i 他 (調整中) 権威ある国際学会 ジャーナル への論文採録による安全性保証 4

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sha1_base64="qd9iyhdlulzl3fodfkmutg9xi8m=">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</latexit> <latexit sha1_base64="qd9iyhdlulzl3fodfkmutg9xi8m=">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</latexit> <latexit sha1_base64="qd9iyhdlulzl3fodfkmutg9xi8m=">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</latexit> <latexit sha1_base64="qd9iyhdlulzl3fodfkmutg9xi8m=">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</latexit> Example: Matchmaker Application profile profile (handsome (aist crypto) rich) aist, crypto 2015: infamous leak incident on a matchmaker service Ashley Madison http://www.businessinsider.com/cheating-affair-website-ashley-madison-hacked-user-data-leaked-2015-7 This application example is inspired by Hoeteck Wee s Asiacrypt 2016 talk.

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sha1_base64="qd9iyhdlulzl3fodfkmutg9xi8m=">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</latexit> Attribute Based Encryption aist, crypto (aist crypto) aist, AI phd, crypto

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sha1_base64="iiaxoobhrpy57lglfib6y3xsbqg=">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</latexit> <latexit sha1_base64="iiaxoobhrpy57lglfib6y3xsbqg=">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</latexit> <latexit sha1_base64="iiaxoobhrpy57lglfib6y3xsbqg=">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</latexit> Attribute Based Encryption: Key Idea Key Idea [SW05] aist, crypto string! function R aist (s) R crypto (s) R aist! R aist (s) aist, AI R aist R AI } (t) (t) phd, crypto mix&match failed! R phd (u) R crypto (u)

M<latexit sha1_base64="u2ff7alaosvarxnk/vr3fqa1joa=">aaac1hichvi9txrrfd2mx4goqzqknhm3ekvnhvx3wsscdy0jc+5cgotmdi91wnxl5u0m60pfadsxglbyawjh/bk2/gelkmtjiymnhwdmxxilxtd58+67757zzr33obhvpvrkbmy4dpnk1wvj1ydutn68nvw6faedrt3evs038qnk07ft5xuhamlp+2oztpqdol7acpaxs/onnkpslwqf6h6stgo7e3p7nmtrupqpd0plqvj1wq3amkvse7hgpzinuw1y9ubdtcqsjzkksrqvvuipdhhbrrcbfejo2j5sppy2yeeq07enax0jls8/vzjablfdrilg2ptu89/hbqvwhtxnngmodnmlz5kqawjwvsghozfp8lg+ya+rxioci9ps5+omssremxo5s/7zv6iaq8azv6glnwvsyshx6lf7nhuylnwhvvf89hz90drsye7eyxfqfytn8okzhl0f7vumwntzgz6uxefewt7n7pcr92x1mjlxusqrxo1mcfmajntxyvyab2z4n66ao432fmxiu2hwy4tlrevhcrf3cj/9rwmrk1hfi+wkr3cme6ntvdaojanhqdfwykbxzzbe/wzyc6hj</latexit> <latexit sha1_base64="u2ff7alaosvarxnk/vr3fqa1joa=">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</latexit> <latexit sha1_base64="u2ff7alaosvarxnk/vr3fqa1joa=">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</latexit> <latexit sha1_base64="u2ff7alaosvarxnk/vr3fqa1joa=">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</latexit> Attribute Based Encryption: Toy Scheme C = { (aist crypto) ^ M + A B aist B crypto aist, crypto A s + B aist s + B crypto aist, AI A t + B aist t + B AI phd, crypto A u + B phd u + B crypto still one-time, private-key scheme

Attribute Based Encryption The Toy scheme ABE Key idea one-time enc private-key enc multiple-time enc public-key enc A 7! A(r) B 7! g B mod N Public-key scheme: Anyone can encrypt. g B mod N hides B, and hence can be public. (crypto basic: discrete log is hard.)

2-input AND Inner product Subspace membership Bounded boolean formulae Unbounded boolean formulae Boolean circuits Arithmetic circuits ABE for any policies? Turing machines

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Big Data Q. Utility + Privacy? Attribute Based Encryption

Utility+ Privacy/Security/Authenticity Cryptography Platform functional encryption attribute-based encryption homomorphic signature homomorphic encryption attribute-based signature secure multi-party computation pseudo-random functions secure boot in trusted execution environment

Big Data Q. Utility + Privacy? when accessing Attribute Based Encryption

Big Data Q. Utility + Privacy? when computing Computing over encrypted data

Homomorphic Encryption 2 5 + 3 7 = 31 Our WebAssembly implementation Encrypt 0.96 msec Multiply 24.3 msec Application: Secure outsourcing Fully homomorphic: can do any +, Decrypt 12.6 msec @Safari iphone 7 Leveled homomorphic: limited number of Ours: fastest 2-level scheme [Attrapadung et al. AsiaCCS18]

Secure Outsourced Computation x x f in the box f(x) f(x) Hot topic: f for machine learning (training/classification) example: Microsoft Cryptonet [Dowlin et al. ICML16],

Example: Private Personal Genome Test y% x Your chance of getting cancer: y% f: cancer probability calculation where f(x)=y Not practical yet when f is heavy

Big Data Q. Utility + Privacy? in joint computing Secure Multi-Party.. Computation Protocol

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App: Outsource to Non-colluding servers aid randomness x x 1 x 2 x 1 x 2 secret sharing MPC.. f on shares f(x) y 1 y 2 y 1 y 2 Our result: Practical protocols via client-aid techniques [Morita, Attrapadung, Teruya, Ohata, Nuida, Hanaoka ESORICS18]

Big Data Q. Utility + Privacy? while authenticating Attribute Based Signature

Attribute Based Signature X can sign Y if R(X, Y)=1 X: aist, crypto Y: (aist_ phd) ^ (crypto_ AI) Privacy: X is private Applications: anonymous credentials Our result: Schemes for any circuits/ Turing machines [Sakai, Attrapadung, Hanaoka PKC16] [Sakai, Katsumata, Attrapadung, Hanaoka Asiacrypt18]

Big Data Q. Util. + Authenticity? Homomorphic Signature

Homomorphic Signature a=2 b=5 + c=3 d=7 Bob Bob Bob Bob = ab+cd=31 Bob Application: Verifiable computation Fully homomorphic: can do any +, Linear homomorphic: can do + Ours: efficient schemes [Attrapadung et al. PKC11, PKC13 ASIACRYPT12]

What We Do from Now Utility+ Privacy/Security/Authenticity Cryptography Platform functional encryption attribute-based encryption homomorphic signature homomorphic encryption attribute-based signature secure multi-party computation pseudo-random functions secure boot in trusted execution environment

What We Do from Now Utility+ Privacy/Security/Authenticity New applications Society 5.0 Cryptography Platform functional encryption attribute-based encryption homomorphic signature New primitives/improved schemes homomorphic encryption attribute-based Cryptographic signature Agility secure multi-party computation ability to switch/combine tools pseudo-random functions secure boot in trusted execution environment

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