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TLS1.3とは何か?
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Shigeki Ohtsu
April 21, 2016
Technology
25
4.3k
TLS1.3とは何か?
Shigeki Ohtsu
April 21, 2016
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Transcript
5-4ͱԿ͔ʁ େൟथ גࣜձࣾΠϯλʔωοτΠχγΞςΟϒ **+ 1,*%BZ
ࣗݾհ w גࣜձࣾΠϯλʔωοτΠχγΞςΟϒ **+ ܦӦاըຊ ෦৴ࣄۀਪਐ෦ w /PEFKT$PSF5FDIOJDBM$PNNJUUFFϝϯόʔ DSZQUP UMT
0QFO44-CJOEJOHΛ୲͍ͯ͠·͢ w *&5'IUUQCJT8(Ͱ)551ͷ༷ࡦఆʹࢀըɻ 5-4ʹ·ͩؔΘ͍ͬͯ·ͤΜɻ w ϒϩάIUUQEIBUFOBOFKQKPWJͰ5-4पΓͷ ωλΛ৭ʑॻ͍͍ͯ·͢ɻ
༰ 5-4ͷ؆୯ͳྺ࢙ 8FCϓϩτίϧͷਐԽ 5-4͕ٻΊΒΕΔഎܠ 5-4ͱԿ͔ ͕࣌ؒΓͳ͍ͷͰओཁ෦ͷΈ
ຊൃදɺ࣌ͷ࠷৽5-4υϥϑτ ESBGU ͱ*&5'ͷٞͷ݁ՌΛҰ෦ؚΜ Ͱ͍·͢ɻ࠷ऴ༷ͰมΘΔՄೳੑ͕͋Γ·͢ɻ
5-4ͷ؆୯ͳྺ࢙ 44- ະൃද 44- 44- *&5'5-48(ελʔτ
5-4 5-4 5-4 5-4ݕ౼ελʔτ 5-4༷Խྃʁ 44-چωοτεέʔϓࣾ ͷࢲతϓϩτίϧ େਓͷࣄͰ໊শมߋ 44-ͱجຊઃܭେ͖͘ม͑ͣվྑ ༷ʑͳػೳ֦ு ݄8(ϥετ ίʔϧඪ %308/ 100%-& #&"45
8FCϓϩτίϧͷਐԽ 5-4ͷҐஔ͚
8FCϓϩτίϧͷਐԽ 5$1 5-4 *1 WW &UIFSOFU )551 )551ͷ࣌ ʙ 5-4ʙ
5-4ʙ
8FCϓϩτίϧͷਐԽ 5$1 5-4 *1 WW &UIFSOFU )551ηϚϯςΟΫε 5$1 *1 WW
&UIFSOFU 5-4 41%: )551ηϚϯςΟΫε )551 )551͔Β)551 ʙ ʙ ϒϥβฏจ ௨৴Λඇαϙʔτ
8FCϓϩτίϧͷਐԽ 26*$ *1 WW 5$1 6%1 5-4 &UIFSOFU )551ηϚϯςΟΫε )551
26*$҉߸ϓϩτίϧ ʙ )551ʙ )551͔Β26*$ ಠࣗ҉߸ ϓϩτίϧ
8FCϓϩτίϧͷਐԽ 26*$ *1 WW 5$1 6%1 &UIFSOFU 5-4 )551ηϚϯςΟΫε )551ʙʁ
ࠓͷओ 26*$͔Β5-4 PSʙ ౷Ұ͞ΕΔ༧ఆ
5-4͕ٻΊΒΕΔഎܠ ΠϯλʔωοτڥͷมԽ w εϊʔσϯࣄ݅ɺ-BWBCJUαʔϏεఀࢭ w ৽ϓϩτίϧ )551 26*$
w ͦͷଞ ར༻ڥͷมԽɺαʔϏεͷଟ༷Խ 5-4ͷݶք w ༷ʑͳٕज़ෛ࠴ͷੵ ৗ࣌5-4
ΠϯλʔωοτڥͷมԽ
ΠϯλʔωοτڥͷมԽ w ถ/4"ʹΑΔQFSWBTJWFTVSWFJMMBODF ൣғͷ౪ ௌߦҝ ͕໌Β͔ʹͳΔɻ w ैདྷ͜͜·ͰͰ͖ͳ͍ͩΖ͏ͱࢥΘΕ͍ͯͨൣғ· Ͱ࣮ߦɻ w
-PHKBNࠃՈ༧ࢉϨϕϧͰCJUT%)&Λղಡ εϊʔσϯࣄ݅
ΠϯλʔωοτڥͷมԽ w εϊʔσϯࣄ݅ͷ༨ͰࡋॴΑΓϝʔϧαʔϏε ͷ5-4ൿີ伴ͷఏग़໋ྩΛड͚Δɻ w ҉߸Խ͞ΕͨσʔλͰ͋ͬͯσʔλอଘʴൿີ伴 ։໋ࣔྩʹΑͬͯ෮߸Խ͞ΕΔڪΕ͕ݱ࣮ʹɻ w 'PSXBSE4FDSFDZͷಋೖ͕ҰؾʹਐΉɻ -BWBCJUαʔϏεఀࢭ
ΠϯλʔωοτڥͷมԽ w ओཁϒϥβʔ5-4௨৴ͷΈ)551Λαϙʔτ w )551 3'$ Ͱɺ5-4ͷར༻҉߸Λݫ੍͘͠ ݶɻछྨͷ҉߸ํࣜΛϒϥοΫϦετͱͯ͠ܝࡌ͠ ͯར༻ෆՄɻ w
ͦͷ੍ݶͷଟ͘ɺ5-4Λલ͠ͰదԠ ৽ϓϩτίϧ )551 OHJOYͷσϑΥϧτ҉߸ํࣜΛ͏ ͱ)551ଓΤϥʔʹͳΓ·͢ɻ
ΠϯλʔωοτڥͷมԽ w (PPHMF͕ಠࣗʹ։ൃ͍ͯ͠Δϓϩτίϧ w 6%1্Ͱ5$1 5-4૬ ЋͷػೳΛ࣮ݱ w 355ʹΑΔߴଓ (PPHMFͰׂ߹
w (PPHMFͷશαʔϏεͰӡ༻த w 'BDFCPPLϞόΠϧΞϓϦͰ5$1্ͷ26*$҉ ߸Λࢼݧத w -*/&26*$ར༻Λࢼݧத ৽ϓϩτίϧ 26*$
ΠϯλʔωοτڥͷมԽ 26*$ʹΑΔ355ʹΑΔߴଓ ҉߸Խ͞ΕͨΞϓϦͷσʔλ (&5)551 $)-0 ϋϯυγΣΠΫ લճར༻ͨ͠伴 ࠶ଓͷࡍʹϋϯυγΣΠΫྃΛͨͣɺҎલͷଓ Ͱར༻ͨ͠伴ΛͬͯΞϓϦσʔλΛ҉߸Խ͠ૹ৴͢Δ 4)-0
ΠϯλʔωοτڥͷมԽ ͦͷଞ ಋೖίετͷݮ -FU`T&ODSZQUͷແྉ%7ূ໌ॻ ੑೳ্ "&4/*ʹΑΔ$16҉߸ॲཧೳྗͷ্ ΠϯϑϥෛՙͷมԽ )551ʹΑΔଓू ఏڙαʔϏεͷଟ༷Խ Ϛϧνςφϯτ$%/
ϒϥβͷํ 'JSFGPY ඇ҉߸Խଓͷஈ֊తഇࢭɺػೳ੍ݶͷํ
5-4ͷݶք
5-4ͷݶք w ݱࡏͷ5-4Ͱఆٛ͞Ε͍ͯΔز͔ͭͷػೳɾ߲ ɺطʹແ݅Ͱར༻͢ΔͱةݥͰ͋Δɻ w 3'$ 5-4%5-4ͷ҆શͳར༻ͷͨΊͷਪʣ w աڈ༷ʑͳ5-4ͷ߈ܸख๏੬ऑੑ͕ެ։͞Εɺͦͷ ରࡦ͕औΒΕ͖ͯͨɻ
w ͔͠͠ػೳͷແޮԽ֦ுػೳͷՃͳͲBEIPDͳର ࡦͰࠜຊతɾൈຊతͳରࡦʹͳ͍ͬͯͳ͍ͷଟ͍ɻ
5-4ͷݶք ҉߸ํࣜͷةຆԽ طʹे҆શͱݴ͑ͳ͍҉߸ํࣜͷαϙʔτ͕༷ Ͱنఆ͞Ε͓ͯΓɺߋ৽͕ඞཁɻ %&4 /*45'14ͷഇࢭ ·Ͱڐ༰ 3$ 3'$ 1SPIJCJUJOH3$$JQIFS4VJUFT
.% 4-05)߈ܸ $7& 4)" 'SFFTUBSU$PMMJTJPO
5-4ͷݶք ҉߸ڧͷةຆԽ w '3&", MPHKBNɿղಡख๏ͷޮԽɺܭࢉࢿݯͷߴԽ ʹΑΓे҆શͱΈͳ͞ΕΔ҉߸ڧ͕ߴ͘ͳͬͨɻεϊʔ σϯࣄ݅ͰࠃՈ༧ࢉϨϕϧͷܭࢉࢿݯڴҖͱͳΔ࣌ɻ w /*4541"SFW &$3:15**ਪɿ֤छஂମʹ
ΑΔࢦඪͱ5-4 3'$Ͱαϙʔτ͍ͯ͠Δ҉߸ͷ தʹCJUҎԼͷ&$%)ͳͲطʹڧෆͷͷؚ͕· Ε͍ͯΔɻ w /*45҉߸ͷٙٛɿ%VBM@&$@%3#(ͷόοΫυΞ
5-4ͷݶք ҉߸ख๏ͷ҆શੑ w ."$UIFO&ODSZQU FH$#$NPEF ͷ҆શੑʹର͢Δٙ w աڈ#&"451BEEJOH0SBDMF߈ܸ-VDLZ5IJSUFFOͷ ߈ܸରɻࠓޙग़ͯ͘Δ͜ͱ͕༧͞ΕΔɻ w
#MPDL$JQIFSͷݶքɺ4USFBN$JQIFS 3$ ͷةຆԽ 5-4"&"% ೝূ͖ͭ҉߸ ͷΈ ҉߸Խ ฏจʴύσΟϯά ."$
5-4ͷݶք 3FOFHPUJBUJPO w 5-4ϋϯυγΣΠΫྃޙʹଓΛҡ࣋ͨ͠··࠶ ϋϯυγΣΠΫΛߦ͏ػೳɻΫϥΠΞϯτೝূ ͷભҠ伴ߋ৽ͷͨΊʹඞཁɻ w աڈ͍Ζ͍Ζͳ߈ܸରͱͳͬͨɻ3FOFHPUJBUJPO લޙͰηογϣϯͷҾ͖ܧ͕͍͗͜͠ͱ͕ىҼ 5-4Ͱഇࢭ
ϋϯυγΣΠΫ ࠶ϋϯυγΣΠΫ
5-4ͷݶք $PNQSFTTJPO w 5-4ͷσʔλΛѹॖ͔ͯ͠Β҉߸Խ͢Δػೳɻϋϯ υγΣΠΫ࣌ʹѹॖํࣜΛ߹ҙ͢Δɻ w ѹॖαΠυνϟωϧ߈ܸɿσʔλѹॖʹΑΔαΠ ζมߋΛख͕͔Γͱͯ͠҉߸ԽใΛ࿙Ӯͤ͞Δख ๏ $3*.&5*.&"$)
5-4Ͱഇࢭ "Y """""""""
5-4ͷݶք 4FTTJPO*% 5JDLFU w Ҏલͷ5-4ηογϣϯใΛҾ͖ܧ͍Ͱ࠶ଓΛߦ ͏ػೳ w ڞ༗ͷࡍͷ͕͍݅ͱೝূόΠύεͷ੬ऑੑ 5-4Ͱഇࢭ 14,
1SF4IBSF,FZ ํࣜʹ౷Ұ 4FTTJPO*% 5JDLFU
5-4ͷݶք 伴ަͷ$SPTT1SPUPDPM߈ܸ w .J5.Ͱ5-4ͷ&$%)伴ަΛ%)伴ަʹΈͳͯ͠Ϋ ϥΠΞϯτʹૹͤ͞Δ߈ܸ w ?ఔͷ֬ͰQSFNBTUFSTFDSFUͷ伴ղಡ͕ޭ w 5-4ͰύϥϝʔλʹΑΔ伴ަΛഇࢭɻ໊લ͖ύϥ ϝʔλར༻ʹ੍ݶɺॺ໊Ληογϣϯϋογϡʹมߋͨ͠ɻ
ηογϣϯϋογϡɿͦΕ·ͰΓऔΓͨ͠શϋϯυγΣΠΫσʔλΛར༻ͯ͠ϋογϡΛੜ͢Δํ๏ &$%)& 4FSWSFS,FZ&YDIBOHF %)& 4FSWSFS,FZ&YDIBOHF
5-4ͷݶք ,FZ%FWJBUJPO w ϋϯυγΣΠΫσʔλ͔Βରশ҉߸ͷൿີ伴."$ 伴Λੜ͢Δํࣜ w 5SJQMF)BOETIBLF߈ܸɿ.J5.ͰOPODFΛૢ࡞ͯ͠ಉ ͡NBTUFSTFDSFUΛ࣋ͭ̎ͭͷ5-4ଓΛཱ֬ɻ 3FOFHPUJBUJPOΛ༠ൃͤͯ͞ѱҙͷ͋ΔσʔλΛૹΓ ࠐΉ߈ܸख๏
5-4ηογϣϯϋογϡΛ༻͍ͨNBTUFSTFDSFUʹมߋ NBTUFSTFDSFU NBTUFSTFDSFU
5-4ͱԿ͔ʁ ࣌ؒͷ߹্ཏతɾৄࡉͳ༷༰·Ͱ౿ΈࠐΈ·ͤΜ
5-4ͷత ϋϯυγΣΠΫσʔλΛͰ͖Δ͚ͩ҉߸Խͯ͠ൿಗ͢Δ ϋϯυγΣΠΫϨΠςϯγʔͷݮ w ࠶ଓͷ߹355 w ৽نଓͷ߹ɺ355 355
ϋϯυγΣΠΫͰަ͢Δ߲ͷݟ͠ɺ؆ૉԽ Ϩίʔυ҉߸Խͷݟ͠ 3$ഇࢭɺ$#$ෆ࠾༻
5-4ͷಛ ༷ʑͳػೳɺ߲ͷݟ͠ɾഇࢭ ࣌ʹ߹Θͳ͘ͳͬͨͷɺΑΓޮతʹมߋमਖ਼Ͱ͖ΔͷΛ 5-4͔Βػೳɾ߲Λଟ͘ഇࢭ ΑΓηΩϡΞʹ ฏจ௨৴͕ඞཁͳ෦Λۃྗগͳͯ͘͠ใΛൿಗ "&"%ύσΟϯάͳͲকདྷతͳ߈ܸʹඋ͑Δ
ੑೳ্ 355 355ଓʹΑΔੑೳ্
͏ϝδϟʔόʔδϣϯΞοϓͱಉ͡վม 5-4ͷओͳഇࢭ߲ ػೳ $PNQSFTTJPO $3*.&5*.&ରࡦ 3FOFHPUJBUJPO 1PTU)BOETIBLFʹஔ͖͑ 4FTTJPO*% 5JDLFU 14,ʹஔ͖͑
҉߸ํࣜ .% 4)" 4)" ةຆԽɺڧରࡦ %4" ར༻༻్ͷݮগ OPO"&"% $#$ 3$ ةຆԽɺ߈ܸϦεΫͷݮ *7ϑΟʔϧυ OPODF࠶ར༻ϦεΫͷഉআ DVTUPN%)& $SPTT1SPUPDPM߈ܸରࡦ &$%)&DPNQSFTTGPSNBU ར༻༻్ͷݟ͠ɺ؆ૉԽ BOPOZNPVT%) 3'$ SBXQVCLFZ Λ༻
͏ϝδϟʔόʔδϣϯΞοϓͱಉ͡վม 5-4ͷओͳഇࢭ߲ ϋϯυγ ΣΠΫ SFDPSEMBZFSͷόʔδϣϯ ޙํޓͷͨΊ͚ͩʹҡ࣋ SBOEPNதͷ࣌ࠁσʔλ ཚੜ͕ߴԽ͠ҙຯ͕ͳ͘ͳͬͨ 1'414,Ҏ֎ͷ伴ަ ൿີ伴ͷةຆԽରࡦ
44-ͷαϙʔτ ةຆԽͨ͠ϓϩτίϧͷαϙʔτഇࢭ $IBOHF$JQIFS4QFD 伴ަޙʹ҉߸Խ։࢝ 4FSWFS$MJFOU,FZ&YDIBOHF $MJFOU4FSWFS)FMMP֦ுʹҠಈ ֦ுػೳ NBY@GSBHNFOU@MFOHUI ?ʹ࠷େΛݻఆ USVODBUFE@INBD "&"%Ͱͷར༻ෆՄɺ҆શͰͳ͍
ͳͥ5-4͡Όͳ͍ͷ͔ w 44--BCͷௐࠪͰɺ5-4Ϩίʔυͷόʔδϣϯ͕ɺ ͷ߹ɺͷ߹Ҏ্ͷ5-4αʔό ͕ଓΛڋ൱͢Δɻ 0QFO44-ͷιʔε ΫϥΠΞϯτ͕5-4Y͕ΦϑΝʔͨ͠ ΒͱΓ͋͑ͣ5-4ͱͯ͠ѻ͏
5-4WT ॳظଓܗଶͷҧ͍ɺߴԽ ଓ 5-4 5-4 355 /" ࠶ଓ14, ʢΫϥΠΞϯτೝূෆՄ 355
/" ৽نଓ αʔόଆൃ৴ 355 ࠶ଓ ৽نଓ 355 ৽نଓ ҉߸ํࣜͷෆ߹ҙ࣌ ߴԽ ߴ Խ 355͕ൺֱతେ͖͍ϞόΠϧڥͷੑೳվળ
5-4ͷϋϯυγΣΠΫ 355 ClientHello ServerHello Certificate ServerHelloDone ClientKeyExchange ChangeCipherSpec Finished ChangeCipherSpec
Finished Application Data Application Data 355 355 355 355 ҉߸Խൣғ ̎355
5-4ͷϋϯυγΣΠΫ 355 ClientHello ServerHello EncryptedExtension ServerConfiguration Certificate CertificateVerify Finished
ApplicationData Finished Application Data Application Data 355 355 355 ҉߸Խൣғ 355 355
5-4ͷϋϯυγΣΠΫ 355 ClientHello Finished ApplicationData end_of_early_data ServerHello EncryptedExtension ServerConfiguration Certificate
CertificateVerify Finished ApplicationData 355 355 ҉߸Խൣғ 355 1SF4IBSFE ,FZ 1SF4IBSFE ,FZ 355ͷσʔλ3FQMZ߈ܸରࡦͷͨΊσʔλͷႈੑ͕ඞཁɻ ઐ༻"1*Λ༻ҙͯ͠ΞϓϦଆͰ୲อ͢Δɻ
5-4ͷ҉߸ํࣜ 伴ަ &$%)& %)& 14, TFDQS Y Y ⒎EIF ೝূ
34" &$%4" 14, STB@QLDT@TIB FDETB@TFDQS@TIB STB@QTT@TIB FE FE ରশ҉߸ "&"% "&4($. $IB$IB1PMZ "&4$$. ),%' ϋογϡ 4)" 4)"·ͩͰ͢ɻ %+#DVSWF Τυϫʔυۂઢ ࣈ.5* .VTU5P*NQMFNFOU ϋϯυγΣΠΫॺ ໊144ͷΈ
5-4ϗοτͳٞ &$ %)&355ͷෆ࠾༻ w 26*$Ͱαʔό͔ΒTFNJTUBUJD伴Λ༧ΊΫϥΠΞϯτ ʹૹ͠ɺ355ଓ࣌ʹσʔλΛ҉߸Խ͢Δɻ w αʔόͷTFNJTUBUJD伴ΫϥΠΞϯτͰͷཧָ͕ w %/4ͰTFNJTUBUJD伴Λެ։͢ΕॳظଓͰ355Ͱ
͖Δɻ HT HY 355҉߸Խσʔλ T ͇
5-4ϗοτͳٞ &$ %)&355ͷෆ࠾༻ w TFNJTUBUJDൿີ伴͕ةຆԽͨ͠߹ʹ'PSXBSE4FDSFDZ͕ഁΒΕΔ w ٞͷ݁Ռɺ &$ %)&CBTFE355ෆ࠾༻ʹ w
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w কདྷతʹඞਢ͔Ͱ͖Δ͔ʁΫϥΠΞϯτʔαʔόؒͰ֦ ுใΛަͯ͠34"144͚ͩ͑ΔΑ͏ʹͰ͖ͳ͍ ͔ɺҾ͖ଓ͖ݕ౼ɻ
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5-4ͰԿ͕มΘΔ͔ 5-4ϥΠϒϥϦ ։ൃऀ ઃܭɾ࣮͠͠ ΞϓϦ։ൃऀ ઐ༻"1*Λͬͨ̌355ରԠ αʔόཧऀ ΫϥΠΞϯτͷීٴΛݟͳ͕Β͍ͭಋೖ͢Δ͔அ ωοτϫʔΫ ཧऀ
ϛυϧϘοΫε '8 *%4 1SPYZ ͷӨڹΛ֬ೝ Ϣʔβʔ Βͳ͍͏ͪʹ͍ͬͯΔɻͳΜ͔ૣ͘ͳͬͨؾ͕͢Δɻ
5-4σϞ ͕࣌ؒ༨Ε IUUQTEFWFMPQFSNP[JMMBPSHKBEPDT/44 IUUQTHJUIVCDPNCJGVSDBUJPONJOU ESBGU Ұ෦ESBGU /44 αʔό (P5-4 ΫϥΠΞϯτ
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