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ユーザブルセキュリティの最新研究動向 (日本銀行 情報セキュリティ・セミナー) / Usable Security Seminar 2022
Ayako Hasegawa
August 08, 2022
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35 slides
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"HFOEB ϢʔβϒϧηΩϡϦςΟݚڀ ώϡʔϚϯϑΝΫλʹணͨ͠ηΩϡϦςΟݚڀ ͷத͔Βɼۚ༥ʹؔ࿈ͷ͋ΔԼهςʔϚʹ͍ͭͯݚڀࣄྫΛհ ϑΟογϯάݚڀ ೝূݚڀ 2
ϢʔβϒϧηΩϡϦςΟݚڀͷ֓ཁʹ͍ͭͯɼҎԼͷࢿྉΛ͝ࢀর͍ͩ͘͞ ɾલͷߨԋɿʮۚ༥ʹٻΊΒΕΔϢʔβϒϧηΩϡϦςΟʯ /55ळࢁ্੮ಛผݚڀһ ຊۜߦΣϒαΠτʹࢿྉܝࡌ༧ఆ ɾʮϢʔβϒϧηΩϡϦςΟೖʯ ౦େֶۚԬઌੜ IUUQTTQFBLFSEFDLDPNBLJSBLBOBPLBVXTUJZVUPSJBSVZV[BCVSVTFLJZVSJUFJSVNFO -
ϑΟογϯά QIJTIJOH • ࣮ࡏ͢Δ৫ɾαʔϏεɾਓʹͳΓ͢·ͯ͠ɼϢʔβʹݸਓใΛఏڙͤ͞Δ ߈ܸ w 4.4Λར༻ͨ͠ϑΟογϯάಛʹεϛογϯάʢ4NJTIJOHʣͱݺͿ r ʮ4.4ʯͱʮ1IJTIJOHʯΛͨ͠ޠ 4
4VCKFDU ϝʔϧϘοΫεͷ༰ྔΛ૿͍ͯͩ͘͠͞ 'SPNOPUJGZ!TVQQPSUNBJMTFSWJDFDPN ϝʔϧϘοΫεͷ༰ྔ͕͍ͬͺ͍ͷͨΊɺϝʔϧΛड৴Ͱ͖·ͤ ΜͰͨ͠ɻϝʔϧϘοΫεͷ༰ྔΛ૿͢ඞཁ͕͋Γ·͢ɻ ԼͷϦϯΫΛΫϦοΫ͠ɺʮϝʔϧϘοΫεͷ༰ྔΛ૿͢ʯΛ બͯ͠ॲཧΛ͍ྃͯͩ͘͠͞ɻ IUUQTVQQPSUNBJMTFSWJDFDPNBDUJWBUJPO ϑΟογϯάϝʔϧͷྫ ߈ܸऀ͕༧Ί༻ҙͨ͠ ِͷΣϒαΠτ ʢϑΟογϯάαΠτʣ -
B ਓؒͷ৺ཧಛੑΛ߈ܸऀʹѱ༻͞ΕΔ w ߈ܸऀ͕ѱ༻͢Δਓؒͷ৺ཧಛੑ 3PCFSU$JBMEJOJ lQSJODJQMFTPGJOGMVFODFz 8 ᶃ ฦใੑʢSFDJQSPDJUZʣ ᶄ
Ұ؏ੑʢDPOTJTUFODZʣ ᶅ ࣾձతূ໌ʢTPDJBMQSPPGʣ ᶆ ݖҖʢBVUIPSJUZʣ ᶇ ҙʢMJLJOHʣ ᶈ رগੑʢTDBSDJUZʣ -
৺ཧτϦοΫͷὃ͞Ε͢͞ ۚ༥ձࣾͷސ٬ w Ԥभʹ͋Δେखۚ༥ػؔΛͳΓ͢·ͨ͠ϑΟογϯάϝʔϧͱͦͷΫϦοΫΛੳ 12 ࢀߟɿ")FJKEFOBOE -"MMPEJ$PHOJUJWF5SJBHJOHPG1IJTIJOH"UUBDLT *O1SPDPG4&$` رগੑͷείΞ͕ߴ͍ϝʔϧ Ұ؏ੑͷείΞ͕ߴ͍ϝʔϧ
ࣾձతূ໌ͷείΞ ݖҖͷείΞ ΫϦοΫͱ໌֬ͳؔೝΊΒΕͳ͍ ҙͷείΞ ฦใੑͷείΞ͕ߴ͍ϝʔϧ ˠ ΫϦοΫ͕͍ ࣾձతূ໌ݖҖΛѱ༻ͨ͠ϝʔϧଞͷจ຺ͰΫϦοΫͷ૿Ճʹܨ͕Δ͜ͱ͕ࣔ͞Ε͍ͯΔ͕ɼ ۚ༥ʹؔ͢Δސ٬ͷݸਓతͳҙࢥܾఆʹ ࣾձతཁૉ͕গͳ͍Մೳੑ༗ɽ ·ͨɼۚ༥ͷސ٬ʹରͯ͠ݖҖͷޮՌΛൃش͢ΔϑΟογϯάϝʔϧΛ߈ܸऀ͕࡞͢Δͷ͍͠ʁ ΫϦοΫ͕ߴ͍ -
৺ཧτϦοΫͷὃ͞Ε͢͞ ۚ༥ձࣾͷސ٬ w Ԥभʹ͋Δେखۚ༥ػؔΛͳΓ͢·ͨ͠ϑΟογϯάϝʔϧͱͦͷΫϦοΫΛੳ 13 ͜Ε͋͘·ͰԤभͷۚ༥ػؔʹͳΓ͢·ͨ͠ϑΟογϯάϝʔϧΛੳͨ݁͠ՌͰ͋Γɼ Ϣʔβ͕ὃ͞Ε͍͢৺ཧςΫχοΫʹɼϢʔβଐੑʹΑΔࠩ ྸɾจԽɾ৬ۀɾੑ֨ ͳͲʹΑΔࠩ ͕͋Δ͜ͱʹҙ
رগੑͷείΞ͕ߴ͍ϝʔϧ Ұ؏ੑͷείΞ͕ߴ͍ϝʔϧ ࣾձతূ໌ͷείΞ ݖҖͷείΞ ΫϦοΫͱ໌֬ͳؔೝΊΒΕͳ͍ ҙͷείΞ ฦใੑͷείΞ͕ߴ͍ϝʔϧ ˠ ΫϦοΫ͕͍ ΫϦοΫ͕ߴ͍ -
Ϣʔβଐੑͱὃ͞Ε͢͞ͷؔ࿈ w ྸɾੑผ<> r ߴྸͷঁੑ͕࠷ὃ͞Ε͍͢ r एऀرগੑʹὃ͞Ε͘͢ɼߴྸऀฦใੑʹὃ͞Ε͍͢ r ߴྸऀͷ΄͏͕ὃ͞Ε͢͞ͷ֮ࣗͱ࣮ࡍͷὃ͞Ε͢͞ʹ͕ࠩ͋Δ w
จԽ<> r ू߹ओٛ ⁶ ݸਓओٛ ͷڧ͍ࠃͷϢʔβͷ΄͏͕ὃ͞Ε͍͢ 14 ࢀߟɿ <>%0MJWFJSBFUBM%JTTFDUJOH4QFBS1IJTIJOH&NBJMTGPS0MEFSWT:PVOH"EVMUT0OUIF*OUFSQMBZPG8FBQPOTPG*OGMVFODFBOE-JGF %PNBJOTJO1SFEJDUJOH4VTDFQUJCJMJUZUP1IJTIJOH *O1SPDPG$)*` <>.#VUBWJDJVT FUBM6OEFSTUBOEJOH4VTDFQUJCJMJUZUP1IJTIJOH&NBJMT"TTFTTJOHUIF*NQBDUPG*OEJWJEVBM%JGGFSFODFTBOE$VMUVSF *O1SPDPG)"*4"` -
w ࢀՃऀ ҰൠతͳΤϯυϢʔβ ʹ63-ͷѼઌΛ͏ΞϯέʔτΛ࣮ࢪ 63-ͷߏʹ͍ͭͯͷϢʔβͷࣝ 16 2ҎԼͷ63-ͦΕͧΕͲͷΑ͏ͳΣϒαΠτʹܨ͕Δͱࢥ͍·͔͢ʁ ᶃ IUUQTQSPGJMFGBDFCPPLDPN ᶄ
IUUQTGBDFCPPLQSPGJMFDPN ᶅ IUUQTUXJUUFSDPNGBDFCPPLDPN ! ! ! ࢀߟɿ4"MCBLSZ FUBM8IBUJTUIJT63-T%FTUJOBUJPO &NQJSJDBM&WBMVBUJPOPG6TFST63-3FBEJOH *O1SPDPG$)*` -
63-ͷߏʹ͍ͭͯͷϢʔβͷࣝ 17 ᶃ IUUQTQSPGJMFGBDFCPPLDPN 㱺'BDFCPPL ᶄ IUUQTGBDFCPPLQSPGJMFDPN 㱺1SPGJMF ᶅ IUUQTUXJUUFSDPNGBDFCPPLDPN
㱺5XJUUFS αϒυϝΠϯ αϒυϝΠϯ αϒσΟϨΫτϦ υϝΠϯ໊ υϝΠϯ໊ υϝΠϯ໊ -
63-ͷߏʹ͍ͭͯͷϢʔβͷࣝ w ࢀՃऀυϝΠϯͱαϒυϝΠϯͷ۠ผ͕͍͓ͭͯΒͣ ʮ'2%/ʹؚ·ΕΔαʔϏε ໊শ ʹ ܨ͕ΔΣϒαΠτʯͰ͋Δͱޡղ͕ͪ͠ w ᶅ αϒσΟϨΫτϦʹαʔϏε໊
ൺֱతޡগͳ͔ͬͨ w શਖ਼ղͨ͠ࢀՃऀɼͭ·Γ63-ͷߏΛཧղ͍ͯͨ͠ࢀՃऀͷΈɽٕज़ܥͷ ࢀՃऀͰ͋ͬͯޡͨ͠ 18 ᶃ IUUQTQSPGJMFGBDFCPPLDPN 㱺 ࢀՃऀ 'BDFCPPL ʹܨ͕Δͱճ ᶄ IUUQTGBDFCPPLQSPGJMFDPN 㱺 ࢀՃऀ 'BDFCPPL ʹܨ͕Δͱճʢޡʣ Ϣʔβ63-ΛݟͯͦͷѼઌΛஅͰ͖ͳ͍͜ͱ͕͋ΔͨΊɼʮϦϯΫΛϗόϦϯάͯ͠ ਅͷ63-Λ֬ೝ͠·͠ΐ͏ʯͷΑ͏ͳΞυόΠεͰෆे -
֤छ63-ِςΫχοΫʹ͍ͭͯͷϢʔβͷࣝ 19 ࢀߟɿ+3FZOPMETFUBM.FBTVSJOH*EFOUJUZ$POGVTJPOXJUI6OJGPSN3FTPVSDF-PDBUPST *O1SPDPG$)*` 2ҎԼͷ63-ͲͷΑ͏ͳΣϒαΠτʹܨ͕Δͱࢥ͍·͔͢ʁ • IUUQTUXJUUUFSDPN • IUUQTCPGBDPNTJHOJOJOGP •
IUUQT • IUUQTЛBZЛBMDPN • IUUQTTFDVSFHNBJMDPN • IUUQTUXJUUFSDPNJTTVFTTVQQPSU • IUUQTUXJUUFSDPNF ! ! ! w ࢀՃऀ ҰൠతͳΤϯυϢʔβ ʹ63-ͷѼઌΛ͏ΞϯέʔτΛ࣮ࢪ 5ZQPTRVBUUJOH 4VCEPNBJOBT%PNBJO *1"EESFTT *%/)PNPHSBQIT 4FMGEFDMBSFETFDVSF 6OGBNJMJBS5-% 63-&ODPEFE $IBSBDUFST -
֤छ63-ِςΫχοΫʹ͍ͭͯͷϢʔβͷࣝ 20 w ࢀՃऀ͕ѼઌΛਖ਼Ͱ͖ͨͷˋͷ63-ʹͱͲ·ͬͨ 63-ِςΫχοΫ ྫ ਖ਼ 5ZQPTRVBUUJOH IUUQTUXJUUUFSDPN
*%/)PNPHSBQIT IUUQTЛBZЛBMDPN 4FMGEFDMBSFETFDVSF IUUQTTFDVSFHNBJMDPN *1"EESFTT IUUQT 6OGBNJMJBS5-% IUUQTUXJUUFSDPNJTTVFTTVQQPSU 4VCEPNBJOBT%PNBJO IUUQTCPGBDPNTJHOJOJOGP 63-&ODPEFE$IBSBDUFST IUUQTUXJUUFSDPNF -
ϝʔϧΫϥΠΞϯτͰͷܯࠂ w ܯࠂදࣔҐஔ 22 ࢀߟɿ+1FUFMLB FUBM1VU:PVS8BSOJOH8IFSF:PVS-JOL*T*NQSPWJOHBOE&WBMVBUJOH&NBJM1IJTIJOH8BSOJOHT *O1SPDPG$)*` 4VCKFDU ʜ 'SPNʜ
ʜ ʜ MJOL ʜ ʜ ʜ ʜ 4VCKFDU ʜ 'SPNʜ ʜ ʜ ʜ ʜ MJOL ʜ ʜ 5IJTFNBJMTFFNTEBOHFSPVT 5IJTFNBJMDPOUBJOTBMJOLUP BGBLFXFCTJUF Ϣʔβͷ ΫϦοΫࢭޮՌ όφʔ ϦϯΫۙ -
w ϦϯΫແޮԽ༗ແ 4VCKFDU ʜ 'SPNʜ ʜ ʜ ʜ IUUQTXXXZBIPPDPN ʜ
ʜ ϝʔϧΫϥΠΞϯτͰͷܯࠂ 23 'BLFXFCTJUF -JOLHPFTUP XXXZBIPPMPHJODPNCS Ϣʔβͷ ΫϦοΫࢭޮՌ ϦϯΫແޮԽແ͠ 4VCKFDU ʜ 'SPNʜ ʜ ʜ ʜ IUUQTXXXZBIPPDPN ʜ ʜ 'BLFXFCTJUF -JOLHPFTUP XXXZBIPPMPHJODPNCS ϦϯΫແޮԽ༗Γ ΫϦοΫ Մೳ ΫϦοΫ ෆՄೳ ΫϦοΫ Մೳ -
Ϣʔβʹ lߟ͑ͯΒ͏zܯࠂ Ϩϙʔτ 24 ࢀߟɿ,"MUIPCBJUJ FUBM*%POU/FFEBO&YQFSU.BLJOH63-1IJTIJOH'FBUVSFT)VNBO$PNQSFIFOTJCMF *O1SPDPG$)*` 63-IUUQTCFTUDOBSHFSVFYDIBOHFSTNLUFOJE ˙ 4VNNBSZ
LOPXOJTTVF1PTTJCMFJTTVF/PJTTVF ˙ %FUBJMFEJOGPSNBUJPO .BOJQVMBUJPO5SJDLT lCFTUDOBSHFSVzJTTJNJMBSUPQPQVMBSEPNBJO lCFTUDIBSHFSVz %PNBJO"HF3FHJTUFSFEPO+VMZUI NPOUI 6TFE5SJDL 4FBSDI 3FTVMU /P.BUDI %PNBJO "HF NPOUI %PNBJO 1PQVMBSJUZ -PX ! ! ! -
ޮՌతͳڭҭํ๏ɾڭҭλΠϛϯά υΠπͷͱ͋Δ৫Ͱ࣮ࢪ͞ΕͨϑΟογϯάڭҭɾϑΟογϯάಛఆςετ w ΦϯαΠτνϡʔτϦΞϧͷޮՌͲΕ͘Β͍࣋ଓ͢Δ͔ʁ ϲ݄ఔɽϲ݄ޙʹνϡʔτϦΞϧલͱେࠩͳ͍ύϑΥʔϚϯεʹ w ͲͷΑ͏ͳܗࣜͷϦϚΠϯμʔڭҭ͕ޮՌత͔ʁ ςΩετɾΑΓ͍ςΩε τɾϏσΦɾΠϯλϥΫςΟϒͳྫࣔ
ϏσΦɾΠϯλϥΫςΟϒͳྫࣔͷޮՌ͕ߴ͘ɼ࣮ࢪޙϲ݄ޙޮՌ༗ 26 ࢀߟɿ#3FJOIFJNFS FUBM"OJOWFTUJHBUJPOPGQIJTIJOHBXBSFOFTTBOEFEVDBUJPOPWFSUJNF8IFOBOEIPXUPCFTUSFNJOEVTFST *O1SPDPG40614` ߴසͰͷܧଓతͳڭҭ͕ඞཁ -
ϑΟογϯάରࡦΞυόΠεͷ࣮ଶௐࠪ Ұൠ͚ΣϒαΠτʹܝࡌ͞ΕͨΞυόΠε Χࠃ Λੳͯ͠໌ͨ͠ w நతͳΞυόΠε͕ଟ͍ r ྫʣʮΫϦοΫ͢Δલʹ63-Λ֬ೝ͠·͠ΐ͏ʯ w ࠞཚΛੜΉΞυόΠε͕ܝࡌ͞Ε͍ͯΔ
r ྫʣʮෆࣗવͳจষͷϝʔϧϑΟογϯάͷՄೳੑ͕͋Γ·͢ʯͱʮ߈ܸऀࣗવͳจ ষΛॻ͖·͢ʯ w ߴͳϑΟογϯάʹؔ͢ΔΞυόΠε͕ͳ͍ r ྫʣΫϩʔϯϑΟογϯά Ҏલʹૹ৴͞Εͨਖ਼نͷϝʔϧΛѱ༻͞ΕΔ ʹؔ͢Δใ͕ ܝࡌ͞Ε͍ͯͳ͍ 27 ࢀߟɿ..PTTBOP FUBM "OBMZTJTPG1VCMJDMZ"WBJMBCMF"OUJ1IJTIJOH8FCQBHFT$POUSBEJDUJOH*OGPSNBUJPO -BDLPG$PODSFUF"EWJDFBOE7FSZ/BSSPX"UUBDL7FDUPS *O1SPDPG&VSP64&$` -
ύεϫʔυϙϦγͷϕετϓϥΫςΟε w ߏϙϦγ r จࣈछࢦఆΛ͠ͳ͍ w ʮେจࣈɾখจࣈɾࣈɾه߸ΛશؚͯΊΑʯϢʔβ ͷੜ͢ΔύεϫʔυͷڧΛ্ͤ͞ͳ͍ r จࣈҎ্Λڧ੍
w ϒϩοΫϦετ r ༰қʹਪଌ͞ΕΔύεϫʔυ࿙ӮύεϫʔυΛڋઈ w ڧϝʔλʔ r ϦΞϧλΠϜͰڧਪଌ r ߈ܸऀ͕ҰఆճҎ্ͷਪଌΛཁ͢ΔڧΛڧ੍ 30 ࢀߟɿ, -FFFUBM 1BTTXPSEQPMJDJFTPGNPTUUPQXFCTJUFTGBJMUPGPMMPXCFTUQSBDUJDFT *O1SPDPG40614` ༗໊άϩʔόϧαΠτͰͷ ࣮ଶௐࠪ αΠτ ͷαΠτ͕ຬͨ͞ͳ͍ ͷαΠτ͕ຬͨ͞ͳ͍ ͷαΠτ͕ຬͨ͞ͳ͍ ڧϝʔλΛఏڙ͍ͯͯ͠ ਪଌํ͕ࣜෆద -
Ϣʔβ͕ύεϫʔυϚωʔδϟʔΛར༻͠ͳ͍ཧ༝ w ΤϯυϢʔβશൠ<> r ύεϫʔυϚωʔδϟʔͷηΩϡϦςΟʹର͢Δෆ৴ײ r ඞཁੑΛײ͡ͳ͍ FH ཧ͍ͯ͠Δύεϫʔυ͕গͳ͍ r
ϢʔβϏϦςΟ͕ѱ͍ FH ਖ਼͘͠อଘ͞Εͳ͍͜ͱ͕͋Δ w ߴྸऀʹಛʹଟ͍ཧ༝<> r ηοτΞοϓ͕໘ r ݱࡏͷϧʔςΟϯΛม͑Δڧ͍ಈػ͕ͳ͍ r Ո͕קΊ͖ͯͨΒ͏ 31 ࢀߟɿ<>4 1FBSNBO FUBM 8IZQFPQMF EPO`U VTFQBTTXPSENBOBHFSTFGGFDUJWFMZ *O1SPDPG40614` <>)3BZFUBM8IZ0MEFS"EVMUT %PO`U 6TF1BTTXPSE.BOBHFST *O1SPDPG4&$` ߴྸऀɼՈͷαϙʔτʹΑΓηοτΞοϓͷোน͑͞ΫϦΞͰ͖ΕɼύεϫʔυϚωʔ δϟʔΛͬͯ͘ΕΔՄೳੑ͕େ͖͍ -
ೝূใͷ࿙ӮͱϢʔβͷೝࣝɾԠ w ύεϫʔυ࿙Ӯͷ͍͕ٙ͋Δͱ௨Λड͚ͨϢʔβ<> r -JOLFE*Oେنύεϫʔυ࿙Ӯࣄ݅ͷޙɼ࿙Ӯͷ͍ٙͷ͋ΔϢʔβʹύεϫʔυ࠶ઃఆ ґཔϝʔϧΛૹ৴ r ࠶ઃఆґཔϝʔϧΛड৴ͨ͠ϢʔβΛରʹϢʔβௐࠪ
Ξϯέʔτ Λ࣮ࢪ r ˋͷࢀՃऀͷΈ͕࠶ઃఆΛ࣮ࢪɽिؒޙɾϲ݄ޙʹ࠶ઃఆͨ͠Ϣʔβଟ r ࠶ઃఆ͠ͳ͍ओͳཧ༝ʮ͍͔͠Βʯ w Ϣʔβʹύεϫʔυ࿙Ӯঢ়گΛఏࣔ<> r ϢʔβௐࠪࢀՃऀͷϝʔϧΞυϨεΛ༻͍ͯύεϫʔυ࿙Ӯσʔληοτ l)BWF*#FFO 1XOFEz Λরձͨ݁͠ՌΛϢʔβௐࠪࢀՃऀʹఏࣔ r ˋͷࢀՃऀͷύεϫʔυ͕࿙Ӯ͍ͯͨ͠ ฏۉ݅ r ࢀՃऀ͕ר͖ࠐ·Εͨ࿙Ӯͷ͏ͪɼࢀՃऀ͕ͦͷࣄ࣮ΛѲ͍ͯͨ͠ͷͷΈ r Ҏ্ͷࢀՃऀ͕ύεϫʔυΛมߋͨ͠ɼ·ͨมߋ͢Δ༧ఆͰ͋Δͱճ 32 ࢀߟɿ<>+ )VI FUBM *`NUPP#VTZUP3FTFUNZ-JOLFE*O1BTTXPSE0OUIF&GGFDUJWFOFTTPG1BTTXPSE3FTFU&NBJMT *O1SPDPG$)*` <>1.BZFSFUBMl/PX*`NBCJUBOHSZz*OEJWJEVBMT`"XBSFOFTT 1FSDFQUJPO BOE3FTQPOTFTUP%BUB#SFBDIFTUIBU"GGFDUFE5IFN *O1SPDPG4&$` -
ೋཁૉೝূ 33 ࢀߟɿ, 3FFTF FUBM "6TBCJMJUZ4UVEZPG'JWF5XP'BDUPS"VUIFOUJDBUJPO.FUIPET *O1SPDPG40614` w ೋཁૉೝূͷϢʔβϏϦςΟ r
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