Android/Chromeで体験できる認証のための標準化仕様の現在と未来 @ DroidKaigi 2022

by ritou

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Android/ChromeͰମݧͰ͖Δ ೝূͷͨΊͷඪ४Խ࢓༷ͷ ݱࡏͱະདྷ @ritou (Ryo Ito) 2022/10/6 - DroidKaigi 2022

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ൃදͷ಺༰ • C޲͚αʔϏεʹ͓͚ΔϢʔβʔೝূͷมભ • Android / Chrome Ͱ࣮ݱͰ͖ΔϩάΠϯUX 2

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ˏritou • Digital Identity ؔ࿈ͷϒϩάࣥචɺษڧձ࣮ࢪ #idcon #iddance • ΤόϯδΣϦετ @ OIDF-J • ΤϯδχΞ ˏ גࣜձࣾMIXI 3

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C޲͚αʔϏεʹ͓͚Δ Ϣʔβʔೝূͷมભ

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ᶃύεϫʔυೝূ

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ύεϫʔυೝূ   (هԱγʔΫϨοτ, Memorized Secrets) 6 • ೝূཁૉ : ஌ࣝ • Ϣʔβʔ/αʔϏε͕ύεϫʔυΛڞ༗ • Ϣʔβʔࣝผࢠͱύεϫʔυͷ૊Έ߹ΘͤΛݕূ

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ύεϫʔυೝূͰ ϢʔβʔɺαʔϏεʹٻΊΒΕΔཁ݅ 7 • Ϣʔβʔ • ύεϫʔυΛ๨Εͳ͍ • ਪଌՄೳͳύεϫʔυΛආ͚ɺଞͷαʔϏεͰ࢖͍·Θ͞ͳ͍ • ύεϫʔυΛୈ̏ऀʹڭ͑ͳ͍ • αʔϏε • ύεϫʔυΛ҆શʹ؅ཧ͢Δ • ֤छ߈ܸ͔ΒϢʔβʔΛอޢ͢Δ

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ύεϫʔυೝূʹ͓͚Δ ϢʔβʔɺαʔϏεͷݱঢ় 8 • Ϣʔβʔ • ઃఆͨ͠ύεϫʔυΛ๨Εͯ͠·͏ • ෳ਺αʔϏεͰ࢖͍ճͨ͠ΓɺਪଌՄೳͳจࣈྻΛར༻͢Δ • ϑΟογϯάαΠτʹύεϫʔυͳͲΛೖྗͯ͠͠·͏ • αʔϏε • ෮߸ՄೳͳܗࣜͰอଘ͠ɺ࠷ऴతʹ࿙Ӯͤͯ͞͠·͏ • ෆਖ਼ϩάΠϯରࡦʹίετΛ͔͚ΒΕͳ͍

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ΞΧ΢ϯτϦΧόϦʔ • “ϩάΠϯͰ͖ͳ͍” ঢ়ଶ͔Βͷճ෮ • ಛఆͷೝূํ͕ࣜ࢖͑ͳ͍࣌ʹ٧·ͳ͍Α͏ʹᷖճ࿏Λ༻ҙ • ผͷํ๏ͰϢʔβʔೝূ(≠ϩάΠϯηογϣϯൃߦ) + ઃఆมߋ • ύεϫʔυೝূͱϝʔϧʹΑΔύεϫʔυϦηοτͷ૊Έ߹Θ͕ͤҰൠత • ϝʔϧ΁ϦϯΫ΍ೝূίʔυΛૹ৴ + ύεϫʔυ࠶ઃఆ • ੈͷதʹ͸ύεϫʔυΛ֮͑ͣʹຖճϦηοτ͢ΔϢʔβʔ΋ଘࡏ͢Δ

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ϝʔϧ/SMSʹΑΔOTP   (ܦ࿏֎ೝূ, Out-of-Band Devices) 10 • ೝূཁૉ : ॴ༗ • αʔϏε͕ϢʔβʔʹSMS/ϝʔϧͰϫϯλΠϜύεϫʔυΛૹΓڞ༗ • ϦϯΫૹ৴&ΫϦοΫ΋͜ΕΛ؆ུԽͨ͠΋ͷͱଊ͑ΒΕΔ • “ύεϫʔυೝূͷΈ”ͱ͍͍࣮࣭ͭͭ2ͭͷೝূํࣜΛఏڙ͢Δ͜ ͱͰɺΞΧ΢ϯτϦΧόϦʔػೳΛఏڙ͢Δͷ͕ఆੴͱͳͬͨ

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ᶄ2ஈ֊/ཁૉೝূͷීٴ

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ύεϫʔυೝূʹ͓͚Δ ϢʔβʔɺαʔϏεͷݱঢ় 12 • Ϣʔβʔ • ઃఆͨ͠ύεϫʔυΛ๨Εͯ͠·͏ • ෳ਺αʔϏεͰ࢖͍ճͨ͠ΓɺਪଌՄೳͳจࣈྻΛར༻͢Δ • ϑΟογϯάαΠτʹύεϫʔυͳͲΛೖྗͯ͠͠·͏ • αʔϏε • ෮߸ՄೳͳܗࣜͰอଘ͠ɺ࠷ऴతʹ࿙Ӯͤͯ͞͠·͏ • ෆਖ਼ϩάΠϯରࡦʹίετΛ͔͚ΒΕͳ͍

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ύεϫʔυϦετ߈ܸɺ ύεϫʔυεϓϨʔ߈ܸ 13 • ύεϫʔυϦετ߈ܸ • Ϣʔβʔࣝผࢠ/ύεϫʔυͷϦετͰࢼߦ • ಉ͡ύεϫʔυΛ࢖͍ճ͍ͯͨ͠ΒΞ΢τ • ύεϫʔυεϓϨʔ߈ܸ • ϢʔβʔࣝผࢠͷϦετʹಉҰͷύεϫʔυͰࢼߦ • ਪଌՄೳͳύεϫʔυΛར༻͍ͯͨ͠ΒΞ΢τ • ͜ΕΒͷ߈ܸ΁ͷରࡦͱͯ͠ɺ௥Ճೝূ͕ීٴ

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ιϑτ΢ΣΞTOTP   (୯ҰཁૉOTPσόΠε, Single-Factor OTP Device) 14 • ೝূཁૉ : ॴ༗ • Ϣʔβʔ/αʔϏεͰൿີ伴Λڞ༗ͯ͠ɺϞόΠϧΞϓϦͳͲ͕࣌ࠁϕʔεͰ ੜ੒ͨ͠OTPΛݕূ (RFC6238) • 2010೥Ҏ߱ɺGoogle͕2ஈ֊ೝূͱͯ͠Google Authenticatorͱͱ΋ʹTOTP ೝূΛఏڙ։࢝ • ۚ༥ػؔͳͲͰ͸RSA/VerisignͳͲͷϋʔυ΢ΣΞτʔΫϯ͕࢖ΘΕ͍ͯ ͕ͨίετ໘ʹ՝୊͕͋ͬͨ

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ϞόΠϧΞϓϦ΍୺຤΁ͷpush௨஌   (ܦ࿏֎ೝূ, Out-of-Band Devices) 15 • ೝূཁૉ : ॴ༗ • ϞόΠϧΞϓϦʹ௨஌ΛૹͬͯϢʔβʔ͕֬ೝͨ͠ΒOK • Ϣʔβʔ͕ར༻͍ͯ͠Δ୺຤΁ͷ௨஌ (Apple, Google) • ܦ࿏ͷ҆શੑ͕ΩϞ • ϞόΠϧΞϓϦ/ݸผ୺຤΁ͷ௨஌ͷํ͕SMS΍EϝʔϧΑΓ҆શ? • Push௨஌ΛૹΓ·ͬͯ͘Ͳ͏ʹ͔͠Α͏ͱ͢Δ߈ܸ΋ൃੜ

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όοΫΞοϓίʔυ   (ϧοΫΞοϓγʔΫϨοτ, Look-Up Secrets) 16 • ೝূཁૉ : ॴ༗ • Ϣʔβʔʹ୯Ұ͋Δ͍͸ෳ਺ͷจࣈྻΛൃߦ͓͖ͯ͠ɺͦͷ஋Λݕূ • TOTP͕࢖͑ͳ͍Α͏ͳέʔεͰ٧·ͳ͍ͨΊͷϢʔβʔ͕औΕΔϦ ΧόϦʔखஈͱͯ͠͠Εͬͱ࠾༻͞Ε͍ͯΔ

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ᶅϑΟογϯάʹڧ͍ೝূํࣜ ͦͯ͠ύεϫʔυϨε΁

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ύεϫʔυೝূʹ͓͚Δ ϢʔβʔɺαʔϏεͷݱঢ় 18 • Ϣʔβʔ • ઃఆͨ͠ύεϫʔυΛ๨Εͯ͠·͏ • ෳ਺αʔϏεͰ࢖͍ճͨ͠ΓɺਪଌՄೳͳจࣈྻΛར༻͢Δ • ϑΟογϯάαΠτʹύεϫʔυͳͲΛೖྗͯ͠͠·͏ • αʔϏε • ෮߸ՄೳͳܗࣜͰอଘ͠ɺ࠷ऴతʹ࿙Ӯͤͯ͞͠·͏ • ෆਖ਼ϩάΠϯରࡦʹίετΛ͔͚ΒΕͳ͍

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ݱ࣮ 19 • ৘ใηΩϡϦςΟ10େڴҖ 2022 ʹͯݸਓ޲͚1Ґʂ • B޲͚Ͱ͸Microsoft ͕ଟཁૉೝূΛճආ͢ΔϑΟογϯά߈ܸ ʮAdversary-in-the-MiddleʢAiTMʣʯʹ͍ͭͯൃද • 2021೥9݄Ҏ߱ɺ1ສҎ্ͷ૊৫͕ඪతʹ

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https://www.microsoft.com/security/blog/2022/07/12/from-cookie-theft-to-bec-attackers-use-aitm-phishing-sites-as-entry-point-to-further- fi nancial-fraud/ !"#$%&'()*+,-./012

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https://www.microsoft.com/security/blog/2022/07/12/from-cookie-theft-to-bec-attackers-use-aitm-phishing-sites-as-entry-point-to-further- fi nancial-fraud/ !"#$%&'()*+,-./012 345'()*+,-./6789:

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https://www.microsoft.com/security/blog/2022/07/12/from-cookie-theft-to-bec-attackers-use-aitm-phishing-sites-as-entry-point-to-further- fi nancial-fraud/ !"#$%&'()*+,-./012 345'()*+,-./6789: ;<=>?@AB6CD89:

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͜Ε·Ͱͷೝূํࣜ͸ ϑΟογϯά଱ੑΛ࣋ͨͳ͍ 26 • ͍ͣΕ΋ਓ͕ؒߦ͏൑அͷ෦෼͕ऑ఺ͱͳΔ • ύεϫʔυೝূ, TOTP, ϝʔϧ/SMSܦ༝ͷOTP: ࠷ॳͷURLΛ֬ೝͤ ͣೖྗ • ެࣜΞϓϦͳͲ΁ͷPush௨஌&ಉҙ : ࠷ॳͷURLΛ֬ೝͤͣʹಉҙ • ࣄલ֬ೝɺཤྺɺ௨஌ͱ͍ͬͨ࢓૊Έ͸͋Δ͕ࠜຊతͳରࡦͰ͸ͳ͍

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FIDOೝূ w/ UserPresense   (୯Ұཁૉ҉߸σόΠε, Single-Factor Cryptographic Devices) 27 • ೝূཁૉ : ॴ༗ • อޢ͞Εͨ҉߸伴Λ༻͍Δϋʔυ΢ΣΞσόΠεΛར༻ • ηΩϡϦςΟΩʔ : PCʹ͚ࢗͩ͢ɺ৮ΕΔ(≠ੜମೝূ)͚ͩ

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FIDOೝূ w/ UserVeri fi cation   (ଟཁૉ҉߸σόΠε, Multi-Factor Cryptographic Devices) 29 • ೝূཁૉ : ॴ༗ + ஌ࣝ/ੜମ • ެ։伴҉߸ + ϩʔΧϧೝূ • อޢ͞Εͨ҉߸伴Λ༻͍Δϋʔυ΢ΣΞσόΠεΛॴ༗͠ɺΞΫςΟ ϕʔτͷͨΊʹ2ཁૉ໨ͷೝূΛඞཁͱ͢Δ΋ͷ • ηΩϡϦςΟΩʔ : PINʹΑΔೝূ • εϚʔτϑΥϯ : ϩʔΧϧೝূ(ը໘ϩοΫղআ૬౰)

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FIDOೝূͷ՝୊ 30 • 伴؅ཧͷݎ࿚ੑΏ͑ͷϦΧόϦʔࠔ೉໰୊ • Authenticator(ηΩϡϦςΟΩʔɺରԠ୺຤)͕յΕͨΓͳ͘ͳͬͨ Γɺަ׵ͨ͠ࡍʹ࠶ొ࿥͕ඞཁ • ରԠαʔϏε͕͜Ε·ͰͷύεϫʔυೝূͷΑ͏ʹ૿͑ͨΒ…? • ಉఔ౓ͷೝূڧ౓Λ࣋ͭೝূํࣜͱ͸??? • ෳ਺ͷAuthenticatorΛొ࿥͓ͯ͘͠ඞཁੑ͕͋Δ

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Passkey - ”FIDO multi-device credentials” 31 • 伴৘ใ͕σόΠεͰ͸ͳ͘Ϣʔβʔʹඥ͚ͮΒΕΔΑ͏ʹͳΔ • ͜Ε·ͰFIDOͰਐΊ͖ͯͨݎ࿚ͳ伴؅ཧͱ͸ผ • ϓϥοτϑΥʔϚʔʹΑΔಉظʹΑΔϦΧόϦʔ໰୊ͷվળ • खݩͷεϚʔτϑΥϯΛར༻ͨ͠UXվળ (ޙ͔Β঺հ)

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Passkey - ”FIDO multi-device credentials” 32 • ୯ҰϓϥοτϑΥʔϜͷྗΛ༻͍ͯύεΩʔΛಉظ 1. Mac ͷ TouchIDΛ༻͍ͯPassKeyΛొ࿥ • iCloud KeychainʹΑΔಉظ -> AppleϢʔβʔʹ伴͕ඥ͚ͮΒΕΔ 2. ϩάΞ΢τͯ͠΋ɺTouchIDͷΈͰϩάΠϯͰ͖Δ(͜Ε·Ͱ௨Γ) 3. iPhone͔ΒΞΫηεͨ͠ࡍʹʮอଘࡁΈͷPassKeyͰϩάΠϯʯΛ બ୒͢ΔͱFaceIDͳͲΛ༻͍ͯϩάΠϯͰ͖Δ

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Passkey - ”FIDO multi-device credentials” 33 • ෳ਺ϓϥοτϑΥʔϜΛލ͙৔߹ͷUXվળ 1. ࣄલʹAndroidͰύεΩʔΛొ࿥ 2. Mac͔ΒΞΫηε͠ɺQRίʔυΛಡΈࠐΜͰAndroidͰϩάΠϯ Մೳ (caBLEͱݺ͹ΕΔ઀ଓํ๏) 3. ͦͷ௚ޙʹTouchID͕ཁٻ͞Εɺࠓޙ͸͜ͷ୺຤ͰTouchIDͷΈͰ ϩάΠϯՄೳʹͳΔ

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ᶆ ೝূํࣜΛ࣋ͨͳ͍ͱ͍͏બ୒ࢶ

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ID࿈ܞʹΑΔϩάΠϯ 35 • Identity Provider(IdP)ͷϢʔβʔ৘ใΛར༻͢Δ • ୅දతͳϓϩτίϧ͕OpenID Connect, OAuth 2.0 + Ϣʔβʔ৘ใ APIͳͲ • Ϣʔβʔࣝผࢠͷඥ෇͚Λ؅ཧ͢Δ͜ͱͰϩάΠϯʹར༻ • ଐੑ৘ใΛ׆༻ͯ͠UXΛ޲্ • ֬ೝࡁΈϝʔϧΞυϨεɺి࿩൪߸ɺຊਓ֬ೝ৘ใͳͲ

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ID࿈ܞͷ՝୊ 36 • IdPͱ৺த໰୊ • ΞΧ΢ϯτBAN, ো֐࣌ʹ͸ͦΕΛར༻͢ΔαʔϏε΋࢖͑ͳ͘ͳ ΔՄೳੑ͕͋Δ • IdPͷΞΧ΢ϯτ͕৐ͬऔΒΕͯ͠·ͬͨΒαʔϏε΋ѱ༻͞ΕΔ

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Identity Wallet   (ؔ࿈Ωʔϫʔυ: SSI, DID, Veri fi able Credentials) 37 • IdPʹґଘ͢ΔͷͰ͸ͳ͘ɺݸਓ͕ࣗ෼ͷ৘ใΛ؅ཧ͢ΔελΠϧ • Ծ૝௨՟͋ͨΓͰ໨ʹ͢Δ໾ׂ෼୲ • Issuer : Ϣʔβʔ৘ใͷఏڙɺূ໌ॻͷൃߦ • Holder(Wallet) : Ϣʔβʔ৘ใΛ؅ཧ͢ΔΞϓϦ΍ϒϥ΢βػೳ • Veri fi er : Holder ʹ৘ใΛཁٻ͠ɺऔಘͨ͠৘ใΛݕূͯ͠ར༻ • Open Wallet Foundation͕ઃཱ͞Εͯ࣌୅͕ਐΜͰ͍͘ؾ഑

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҆શੑɺརศੑΛߴΊΔ Ξϓϩʔν

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՝୊ΛΧόʔ͢Δ࢓૊Έ͕ඞཁ 39 • Ϣʔβʔ͕Ͱ͖Δ΋ͷ • ύεϫʔυϚωʔδϟʔͷར༻ • αʔϏε͕Ͱ͖Δ͜ͱ : खݩͷεϚʔτϑΥϯΛ༻͍ͯརศੑΛ͋͛ Δ࢓૊ΈΛಋೖ • SMS OTP : WebOTP • WebAuthn

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ύεϫʔυϚωʔδϟʔͷར༻ 40 • ύεϫʔυੜ੒ɺ؅ཧΛ೚ͤΔ = ೝূཁૉΛ”ॴ༗”ʹมߋ • TOTPରԠ΍όοΫΞοϓίʔυΛอଘͰ͖Δ΋ͷ΋͋Δ • Ϛελʔύεϫʔυ؅ཧ͕ॏཁʹͳΔ(SPOFͱ΋ݴ͑Δ) • ϒϥ΢β / OS෇ਵͷ΋ͷ vs ಠཱͨ͠αʔϏε • ར༻ελΠϧʹԠͯ͡બ΂͹ྑͦ͞͏

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Android / Chrome   Ͱ࣮ݱͰ͖ΔϩάΠϯUX

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ࠓճͷΩʔϫʔυ : “खݩͷεϚϗͰϩάΠϯ” (a.k.a Decoupled Authentication)

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WebOTP https://web.dev/web-otp/ 43 • SMSͰૹΒΕͨϫϯλΠϜύεϫʔυΛ҆શʹऔಘ͢ΔͨΊͷ࢓૊Έ • υϝΠϯΛؚΉϫϯλΠϜύεϫʔυͷϝοηʔδϑΥʔϚοτ • JavaScript هड़ + input λά • Android ͷ SMS Retriever API ͱಉ౳

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WebOTP - Android Chrome ϒϥ΢βΛ։͍ͨ··OTPΛऔಘՄೳ 44

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WebOTP - Android Chrome ϒϥ΢βΛ։͍ͨ··OTPΛऔಘՄೳ 45

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WebOTP - (Desktop / Android) Chrome ಉظ͍ͯ͠ΔAndroid୺຤ͷ௨஌Ͱಉҙ->సૹ 46

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WebOTP - (Desktop / Android) Chrome ಉظ͍ͯ͠ΔAndroid୺຤ͷ௨஌Ͱಉҙ->సૹ 47

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WebOTP https://web.dev/web-otp/ 48 • ϝοηʔδʹؚ·ΕΔυϝΠϯͱҰக͍ͯ͠Δ͔Λϒϥ΢β͕ݕূ • ”͜ͷ࢓૊ΈΛ࢖͏ͱ͖͸” ϑΟογϯά଱ੑΛ࣋ͭ • ؀ڥ͝ͱͷରԠ͸ෆཁɺඞཁͳͷ͸ϒϥ΢β͕WebOTPʹରԠ͍ͯ͠ Δ͔Ͳ͏͔͚ͩ • ࢓༷௨Γ࣮૷͢Δ͚ͩͰChrome͕ରԠͯ͘͠ΕΔ

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WebAuthn https://www.w3.org/TR/webauthn-2/ 49 • WebΞϓϦέʔγϣϯ͔ΒFIDOೝূΛར༻͢ΔͨΊͷϒϥ΢βAPI • ϒϥ΢β͕հೖ͠ɺ伴৘ใ͕originʹඥ͚ͮΒΕΔͨΊʹϑΟογϯά଱ੑΛ࣋ͭ • Platform Authenticator(εϚϗ/PCࣗମ) / Roaming Authenticator(ηΩϡϦςΟΩʔ) ͕ೝূثͱͯ͠ར༻Մೳ • खݩͷεϚʔτϑΥϯΛ༻͍ͯ伴৘ใͷొ࿥/ೝূΛ࣮ݱ͢Δ࢓૊Έ͕͋Δ • caBLE (cloud-assisted BLE) : QRίʔυ + BLE • ChromeͰಉظ͞Ε͍ͯΔ୺຤ : Push௨஌ + BLE

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WebAuthn w/ caBLE QRίʔυ + BLE ͰϩάΠϯ 50 PC Android

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WebAuthn w/ caBLE Ұ౓ར༻ͨ͠୺຤͸Push௨஌Ͱར༻Մೳ 51 PC Android

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WebAuthn w/ (Desktop + Android) Chrome ಉظࡁΈͷ୺຤͸࠷ॳ͔ΒPush௨஌Ͱར༻Մೳ 52 PC Android

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WebAuthn 53 • ౰ॳ͸୺຤ͦͷ΋ͷ or USB/NFC/BLEͳͲͰηΩϡϦςΟΩʔͱͭͳ ͙ͱ͍͏ҹ৅͕ڧ͔͕ͬͨɺखݩͷεϚϗͱͭͳ͙࢓૊Έ΋͋Δ • ୯ͳΔQRίʔυ+ωοτϫʔΫΞΫηεΛ༻͍ͨϩάΠϯͰ͸ͳ͘ɺ BLEͰۙڑ཭ʹ͋ΔεϚϗͱ௨৴͢Δ͜ͱͰຊਓҎ֎ͷ୺຤Ͱ઀ଓ͞Ε Δ͜ͱΛ๷͙ߟྀ΋͞Ε͍ͯΔ • ChromeͰಉظ͍ͯ͠ΔεϚʔτϑΥϯͰ͋Ε͹Push௨஌ͰΑΓָʹར ༻Մೳ

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·ͱΊ 54 • C޲͚αʔϏεͰ࢖ΘΕ͍ͯΔϢʔβʔೝূʹ͍ͭͯৼΓฦͬͨ • ͦΕͧΕͷೝূํࣜͰͷಛ௃Λཧղ͠Α͏ • Android/ChromeΛ༻͍ͯ “खݩͷεϚϗͰϩάΠϯ” Λ࣮ݱ͢ΔͨΊ ͷ࢓૊ΈΛ঺հͨ͠ • WebΞϓϦϕʔεͷೝূػೳΛఏڙ͍ͯ͠ΔαʔϏε͸ɺϩάΠϯ ͷUXΛߟ͑Δ࣌ʹҙࣝ͠Α͏

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ࢀߟϦϯΫ • ೝূʹ·ͭΘΔηΩϡϦςΟͷ৽ৗࣝ rev3 • https://speakerdeck.com/kthrtty/ren-zheng- nimatuwarusekiyuriteifalsexin-chang-shi • NIST Special Publication 800-63B Digital Identity Guidelines (຋༁൛) • https://openid-foundation-japan.github.io/800-63-3- fi nal/ sp800-63b.ja.html

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ࢀߟϦϯΫ 56 • GTA৽࡞ϦʔΫʹ࢖ΘΕͨ“ଟཁૉೝূർΕ”߈ܸͱ͸ɹ1࣌ؒҎ্௨ ஌߈Ίɺैۀһͷࠜෛ͚ૂ͏ • https://www.itmedia.co.jp/news/articles/2209/28/news050.html • 2022೥൛Ϩϙʔτʮ2022 State of Secure Identity ReportʯΛެ։ • https://www.okta.com/jp/press-room/press-releases/ okta-2022ssir/

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ࢀߟϦϯΫ 57 • σδλϧ΢ΥϨοτͷ૬ޓӡ༻ੑΛ໨ࢦ͢ஂମɺThe Linux Foundation͕ઃཱ΁ • https://japan.zdnet.com/article/35193346/

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ࢀߟϦϯΫ 58 • Our Take on Passkeys • https://auth0.com/blog/our-take-on-passkeys/ • Cross-device WebOTP • https://docs.google.com/document/d/ 1SlIaRlH0WEvvLMtQJZMuwZbH5bRs6SCPlxXwwnJQHMU/ edit#heading=h.xgjl2srtytjt

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׬ ࣭໰ɺҙݟɺײ૝Λ ͓଴͍ͪͯ͠·͢ɻ ฐࣾʹڵຯ͕͋Δํ΋ੋඇʂ