Nuttapong (Nuts) Attrapadung CPSEC symposium

Transkrypt

1 Nuttapong (Nuts) Attrapadung CPSEC symposium

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

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

4 暗号プラットフォーム研究チームの紹介 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

5 Big Data Utility health care, marketing, financial, machine learning

6 Big Data Privacy Problem: traditional encryption is all-or-nothing

7 Big Data Q. Utility + Privacy? encryption with access control

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9 M<latexit sha1_base64="u2ff7alaosvarxnk/vr3fqa1joa=">aaac1hichvi9txrrfd2mx4goqzqknhm3ekvnhvx3wsscdy0jc+5cgotmdi91wnxl5u0m60pfadsxglbyawjh/bk2/gelkmtjiymnhwdmxxilxtd zzr33obhvpvrkbmy4dpnk1wvj1ydutn68nvw6faedrt3evs038qnk07ft5xuhamlp+2oztpqdol7acpaxs/onnkpslwqf6h6stgo7e3p7nmtrupqpd0plqvj1wq3amkvse7hgpzinuw1y9ubdtcqsjzkksrqvvuipdhhbrrcbfejo2j5sppy2yeeq07enax0jls8/vzjablfdrilg2ptu89/hbqvwhtxnngmodnmlz5kqawjwvsghozfp8lg+ya+rxioci9ps5+omssremxo5s/7zv6iaq8azv6glnwvsyshx6lf7nhuylnwhvvf89hz90drsye7eyxfqfytn8okzhl0f7vumwntzgz6uxefewt7n7pcr92x1mjlxusqrxo1mcfmajntxyvyab2z4n66ao432fmxiu2hwy4tlrevhcrf3cj/9rwmrk1hfi+wkr3cme6ntvdaojanhqdfwykbxzzbe/wzyc6hj</latexit> <latexit sha1_base64="u2ff7alaosvarxnk/vr3fqa1joa=">aaac1hichvi9txrrfd2mx4goqzqknhm3ekvnhvx3wsscdy0jc+5cgotmdi91wnxl5u0m60pfadsxglbyawjh/bk2/gelkmtjiymnhwdmxxilxtd 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sha1_base64="ajxytvyyzu3iazi/nz6pruxkyeu=">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</latexit> <latexit sha1_base64="ajxytvyyzu3iazi/nz6pruxkyeu=">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</latexit> Attribute Based Encryption (naively) (aist crypto) C = M R aist R crypto aist, crypto R aist aist, AI R crypto C R aist R crypto ) M R aist R AI phd, crypto R phd R crypto

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sha1_base64="ajxytvyyzu3iazi/nz6pruxkyeu=">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</latexit> Attribute Based Encryption (naively) aist, crypto C R aist R crypto ) M (aist crypto) R aist R crypto C = M R aist R crypto aist, AI R aist R AI } mix&match phd, crypto R phd R crypto Not secure if users collude

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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)

13 M<latexit sha1_base64="u2ff7alaosvarxnk/vr3fqa1joa=">aaac1hichvi9txrrfd2mx4goqzqknhm3ekvnhvx3wsscdy0jc+5cgotmdi91wnxl5u0m60pfadsxglbyawjh/bk2/gelkmtjiymnhwdmxxilxtd zzr33obhvpvrkbmy4dpnk1wvj1ydutn68nvw6faedrt3evs038qnk07ft5xuhamlp+2oztpqdol7acpaxs/onnkpslwqf6h6stgo7e3p7nmtrupqpd0plqvj1wq3amkvse7hgpzinuw1y9ubdtcqsjzkksrqvvuipdhhbrrcbfejo2j5sppy2yeeq07enax0jls8/vzjablfdrilg2ptu89/hbqvwhtxnngmodnmlz5kqawjwvsghozfp8lg+ya+rxioci9ps5+omssremxo5s/7zv6iaq8azv6glnwvsyshx6lf7nhuylnwhvvf89hz90drsye7eyxfqfytn8okzhl0f7vumwntzgz6uxefewt7n7pcr92x1mjlxusqrxo1mcfmajntxyvyab2z4n66ao432fmxiu2hwy4tlrevhcrf3cj/9rwmrk1hfi+wkr3cme6ntvdaojanhqdfwykbxzzbe/wzyc6hj</latexit> <latexit sha1_base64="u2ff7alaosvarxnk/vr3fqa1joa=">aaac1hichvi9txrrfd2mx4goqzqknhm3ekvnhvx3wsscdy0jc+5cgotmdi91wnxl5u0m60pfadsxglbyawjh/bk2/gelkmtjiymnhwdmxxilxtd zzr33obhvpvrkbmy4dpnk1wvj1ydutn68nvw6faedrt3evs038qnk07ft5xuhamlp+2oztpqdol7acpaxs/onnkpslwqf6h6stgo7e3p7nmtrupqpd0plqvj1wq3amkvse7hgpzinuw1y9ubdtcqsjzkksrqvvuipdhhbrrcbfejo2j5sppy2yeeq07enax0jls8/vzjablfdrilg2ptu89/hbqvwhtxnngmodnmlz5kqawjwvsghozfp8lg+ya+rxioci9ps5+omssremxo5s/7zv6iaq8azv6glnwvsyshx6lf7nhuylnwhvvf89hz90drsye7eyxfqfytn8okzhl0f7vumwntzgz6uxefewt7n7pcr92x1mjlxusqrxo1mcfmajntxyvyab2z4n66ao432fmxiu2hwy4tlrevhcrf3cj/9rwmrk1hfi+wkr3cme6ntvdaojanhqdfwykbxzzbe/wzyc6hj</latexit> <latexit sha1_base64="u2ff7alaosvarxnk/vr3fqa1joa=">aaac1hichvi9txrrfd2mx4goqzqknhm3ekvnhvx3wsscdy0jc+5cgotmdi91wnxl5u0m60pfadsxglbyawjh/bk2/gelkmtjiymnhwdmxxilxtd zzr33obhvpvrkbmy4dpnk1wvj1ydutn68nvw6faedrt3evs038qnk07ft5xuhamlp+2oztpqdol7acpaxs/onnkpslwqf6h6stgo7e3p7nmtrupqpd0plqvj1wq3amkvse7hgpzinuw1y9ubdtcqsjzkksrqvvuipdhhbrrcbfejo2j5sppy2yeeq07enax0jls8/vzjablfdrilg2ptu89/hbqvwhtxnngmodnmlz5kqawjwvsghozfp8lg+ya+rxioci9ps5+omssremxo5s/7zv6iaq8azv6glnwvsyshx6lf7nhuylnwhvvf89hz90drsye7eyxfqfytn8okzhl0f7vumwntzgz6uxefewt7n7pcr92x1mjlxusqrxo1mcfmajntxyvyab2z4n66ao432fmxiu2hwy4tlrevhcrf3cj/9rwmrk1hfi+wkr3cme6ntvdaojanhqdfwykbxzzbe/wzyc6hj</latexit> <latexit sha1_base64="u2ff7alaosvarxnk/vr3fqa1joa=">aaac1hichvi9txrrfd2mx4goqzqknhm3ekvnhvx3wsscdy0jc+5cgotmdi91wnxl5u0m60pfadsxglbyawjh/bk2/gelkmtjiymnhwdmxxilxtd zzr33obhvpvrkbmy4dpnk1wvj1ydutn68nvw6faedrt3evs038qnk07ft5xuhamlp+2oztpqdol7acpaxs/onnkpslwqf6h6stgo7e3p7nmtrupqpd0plqvj1wq3amkvse7hgpzinuw1y9ubdtcqsjzkksrqvvuipdhhbrrcbfejo2j5sppy2yeeq07enax0jls8/vzjablfdrilg2ptu89/hbqvwhtxnngmodnmlz5kqawjwvsghozfp8lg+ya+rxioci9ps5+omssremxo5s/7zv6iaq8azv6glnwvsyshx6lf7nhuylnwhvvf89hz90drsye7eyxfqfytn8okzhl0f7vumwntzgz6uxefewt7n7pcr92x1mjlxusqrxo1mcfmajntxyvyab2z4n66ao432fmxiu2hwy4tlrevhcrf3cj/9rwmrk1hfi+wkr3cme6ntvdaojanhqdfwykbxzzbe/wzyc6hj</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

14 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.)

15 2-input AND Inner product Subspace membership Bounded boolean formulae Unbounded boolean formulae Boolean circuits Arithmetic circuits ABE for any policies? Turing machines

16 M<latexit sha1_base64="u2ff7alaosvarxnk/vr3fqa1joa=">aaac1hichvi9txrrfd2mx4goqzqknhm3ekvnhvx3wsscdy0jc+5cgotmdi91wnxl5u0m60pfadsxglbyawjh/bk2/gelkmtjiymnhwdmxxilxtd zzr33obhvpvrkbmy4dpnk1wvj1ydutn68nvw6faedrt3evs038qnk07ft5xuhamlp+2oztpqdol7acpaxs/onnkpslwqf6h6stgo7e3p7nmtrupqpd0plqvj1wq3amkvse7hgpzinuw1y9ubdtcqsjzkksrqvvuipdhhbrrcbfejo2j5sppy2yeeq07enax0jls8/vzjablfdrilg2ptu89/hbqvwhtxnngmodnmlz5kqawjwvsghozfp8lg+ya+rxioci9ps5+omssremxo5s/7zv6iaq8azv6glnwvsyshx6lf7nhuylnwhvvf89hz90drsye7eyxfqfytn8okzhl0f7vumwntzgz6uxefewt7n7pcr92x1mjlxusqrxo1mcfmajntxyvyab2z4n66ao432fmxiu2hwy4tlrevhcrf3cj/9rwmrk1hfi+wkr3cme6ntvdaojanhqdfwykbxzzbe/wzyc6hj</latexit> <latexit sha1_base64="u2ff7alaosvarxnk/vr3fqa1joa=">aaac1hichvi9txrrfd2mx4goqzqknhm3ekvnhvx3wsscdy0jc+5cgotmdi91wnxl5u0m60pfadsxglbyawjh/bk2/gelkmtjiymnhwdmxxilxtd zzr33obhvpvrkbmy4dpnk1wvj1ydutn68nvw6faedrt3evs038qnk07ft5xuhamlp+2oztpqdol7acpaxs/onnkpslwqf6h6stgo7e3p7nmtrupqpd0plqvj1wq3amkvse7hgpzinuw1y9ubdtcqsjzkksrqvvuipdhhbrrcbfejo2j5sppy2yeeq07enax0jls8/vzjablfdrilg2ptu89/hbqvwhtxnngmodnmlz5kqawjwvsghozfp8lg+ya+rxioci9ps5+omssremxo5s/7zv6iaq8azv6glnwvsyshx6lf7nhuylnwhvvf89hz90drsye7eyxfqfytn8okzhl0f7vumwntzgz6uxefewt7n7pcr92x1mjlxusqrxo1mcfmajntxyvyab2z4n66ao432fmxiu2hwy4tlrevhcrf3cj/9rwmrk1hfi+wkr3cme6ntvdaojanhqdfwykbxzzbe/wzyc6hj</latexit> <latexit sha1_base64="u2ff7alaosvarxnk/vr3fqa1joa=">aaac1hichvi9txrrfd2mx4goqzqknhm3ekvnhvx3wsscdy0jc+5cgotmdi91wnxl5u0m60pfadsxglbyawjh/bk2/gelkmtjiymnhwdmxxilxtd zzr33obhvpvrkbmy4dpnk1wvj1ydutn68nvw6faedrt3evs038qnk07ft5xuhamlp+2oztpqdol7acpaxs/onnkpslwqf6h6stgo7e3p7nmtrupqpd0plqvj1wq3amkvse7hgpzinuw1y9ubdtcqsjzkksrqvvuipdhhbrrcbfejo2j5sppy2yeeq07enax0jls8/vzjablfdrilg2ptu89/hbqvwhtxnngmodnmlz5kqawjwvsghozfp8lg+ya+rxioci9ps5+omssremxo5s/7zv6iaq8azv6glnwvsyshx6lf7nhuylnwhvvf89hz90drsye7eyxfqfytn8okzhl0f7vumwntzgz6uxefewt7n7pcr92x1mjlxusqrxo1mcfmajntxyvyab2z4n66ao432fmxiu2hwy4tlrevhcrf3cj/9rwmrk1hfi+wkr3cme6ntvdaojanhqdfwykbxzzbe/wzyc6hj</latexit> <latexit sha1_base64="u2ff7alaosvarxnk/vr3fqa1joa=">aaac1hichvi9txrrfd2mx4goqzqknhm3ekvnhvx3wsscdy0jc+5cgotmdi91wnxl5u0m60pfadsxglbyawjh/bk2/gelkmtjiymnhwdmxxilxtd zzr33obhvpvrkbmy4dpnk1wvj1ydutn68nvw6faedrt3evs038qnk07ft5xuhamlp+2oztpqdol7acpaxs/onnkpslwqf6h6stgo7e3p7nmtrupqpd0plqvj1wq3amkvse7hgpzinuw1y9ubdtcqsjzkksrqvvuipdhhbrrcbfejo2j5sppy2yeeq07enax0jls8/vzjablfdrilg2ptu89/hbqvwhtxnngmodnmlz5kqawjwvsghozfp8lg+ya+rxioci9ps5+omssremxo5s/7zv6iaq8azv6glnwvsyshx6lf7nhuylnwhvvf89hz90drsye7eyxfqfytn8okzhl0f7vumwntzgz6uxefewt7n7pcr92x1mjlxusqrxo1mcfmajntxyvyab2z4n66ao432fmxiu2hwy4tlrevhcrf3cj/9rwmrk1hfi+wkr3cme6ntvdaojanhqdfwykbxzzbe/wzyc6hj</latexit> General Design Framework for ABE if R(Y, X)=1 Y X if R(Y, X)=0 Main results: - [Attrapadung EUROCRYPT14] - [Attrapadung ASIACRYPT16] - [Attrapadung PKC17] - Independently by [Wee TCC14], [Chen et. al. EUROCRYPT15] Introduce Pair encoding functions f(y) and g(x)

17 Big Data Q. Utility + Privacy? Attribute Based Encryption

18 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

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

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

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

22 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],

23 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

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

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26 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]

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

28 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]

29 Big Data Q. Util. + Authenticity? Homomorphic Signature

30 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]

31 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

32 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