TLS1.3とは何か？

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1. 5-4ͱ͸Կ͔ʁ େ௡ൟथ גࣜձࣾΠϯλʔωοτΠχγΞςΟϒ **+ 1,*%BZ

2. ࣗݾ঺հ w גࣜձࣾΠϯλʔωοτΠχγΞςΟϒ **+ ܦӦاըຊ ෦഑৴ࣄۀਪਐ෦ w /PEFKT$PSF5FDIOJDBM$PNNJUUFFϝϯόʔ DSZQUP UMT

   0QFO44-CJOEJOHΛ୲౰͍ͯ͠·͢ w *&5'IUUQCJT8(Ͱ)551ͷ࢓༷ࡦఆʹࢀըɻ 5-4ʹ͸·ͩ௚઀ؔΘ͍ͬͯ·ͤΜɻ w ϒϩάIUUQEIBUFOBOFKQKPWJͰ5-4पΓͷ ωλΛ৭ʑॻ͍͍ͯ·͢ɻ

3. ಺༰ 5-4ͷ؆୯ͳྺ࢙ 8FCϓϩτίϧͷਐԽ 5-4͕ٻΊΒΕΔഎܠ 5-4ͱ͸Կ͔ ͕࣌ؒ଍Γͳ͍ͷͰओཁ෦෼ͷΈ

   ຊൃද͸ɺ࣌఺ͷ࠷৽5-4υϥϑτ ESBGU ͱ*&5'ͷٞ࿦ͷ݁ՌΛҰ෦ؚΜ Ͱ͍·͢ɻ࠷ऴ࢓༷ͰมΘΔՄೳੑ͕͋Γ·͢ɻ

4. 5-4ͷ؆୯ͳྺ࢙ 44- ະൃද ೥ 44- ೥ 44- ೥ *&5'5-48(ελʔτ ೥

   5-4 ೥ 5-4 ೥ 5-4 ೥ 5-4ݕ౼ελʔτ ೥ 5-4࢓༷Խ׬ྃʁ 44-͸چωοτεέʔϓࣾ ͷࢲతϓϩτίϧ େਓͷࣄ৘Ͱ໊শมߋ 44-ͱجຊઃܭ͸େ͖͘ม͑ͣվྑ ༷ʑͳػೳ֦ு ݄຤8(ϥετ ίʔϧ໨ඪ %308/ 100%-& #&"45

5. 8FCϓϩτίϧͷਐԽ 5-4ͷҐஔ෇͚

6. 8FCϓϩτίϧͷਐԽ 5$1 5-4 *1 WW &UIFSOFU )551 )551ͷ࣌୅ ʙ 5-4ʙ

   5-4ʙ

7. 8FCϓϩτίϧͷਐԽ 5$1 5-4 *1 WW &UIFSOFU )551ηϚϯςΟΫε 5$1 *1 WW

   &UIFSOFU 5-4 41%: )551ηϚϯςΟΫε )551 )551͔Β)551΁ ʙ ʙ ϒϥ΢β͸ฏจ ௨৴Λඇαϙʔτ

8. 8FCϓϩτίϧͷਐԽ 26*$ *1 WW 5$1 6%1 5-4 &UIFSOFU )551ηϚϯςΟΫε )551

   26*$҉߸ϓϩτίϧ ʙ )551ʙ )551͔Β26*$΁ ಠࣗ҉߸ ϓϩτίϧ

9. 8FCϓϩτίϧͷਐԽ 26*$ *1 WW 5$1 6%1 &UIFSOFU 5-4 )551ηϚϯςΟΫε )551ʙʁ

   ࠓ೔ͷओ୊ 26*$͔Β5-4΁ PSʙ ౷Ұ͞ΕΔ༧ఆ

10. 5-4͕ٻΊΒΕΔഎܠ Πϯλʔωοτ؀ڥͷมԽ w εϊʔσϯࣄ݅ɺ-BWBCJUαʔϏεఀࢭ w ৽ϓϩτίϧ )551 26*$

    w ͦͷଞ ར༻؀ڥͷมԽɺαʔϏεͷଟ༷Խ 5-4ͷݶք w ༷ʑͳٕज़ෛ࠴ͷ஝ੵ ৗ࣌5-4

11. Πϯλʔωοτ؀ڥͷมԽ

12. Πϯλʔωοτ؀ڥͷมԽ w ถ/4"ʹΑΔQFSWBTJWFTVSWFJMMBODF ޿ൣғͷ౪ ௌߦҝ ͕໌Β͔ʹͳΔɻ w ैདྷ͜͜·ͰͰ͖ͳ͍ͩΖ͏ͱࢥΘΕ͍ͯͨൣғ· Ͱ࣮ߦɻ w

    -PHKBNࠃՈ༧ࢉϨϕϧͰCJUT%)&Λղಡ εϊʔσϯࣄ݅

13. Πϯλʔωοτ؀ڥͷมԽ w εϊʔσϯࣄ݅ͷ༨೾Ͱࡋ൑ॴΑΓϝʔϧαʔϏε ͷ5-4ൿີ伴ͷఏग़໋ྩΛड͚Δɻ w ҉߸Խ͞ΕͨσʔλͰ͋ͬͯ΋σʔλอଘʴൿີ伴 ։໋ࣔྩʹΑͬͯ෮߸Խ͞ΕΔڪΕ͕ݱ࣮ʹɻ w 'PSXBSE4FDSFDZͷಋೖ͕ҰؾʹਐΉɻ -BWBCJUαʔϏεఀࢭ

14. Πϯλʔωοτ؀ڥͷมԽ w ओཁϒϥ΢βʔ͸5-4௨৴ͷΈ)551Λαϙʔτ w )551 3'$ Ͱ͸ɺ5-4ͷར༻҉߸Λݫ੍͘͠ ݶɻछྨͷ҉߸ํࣜΛϒϥοΫϦετͱͯ͠ܝࡌ͠ ͯར༻ෆՄɻ w

    ͦͷ੍ݶͷଟ͘͸ɺ5-4Λલ౗͠ͰదԠ ৽ϓϩτίϧ )551 OHJOYͷσϑΥϧτ҉߸ํࣜΛ࢖͏ ͱ)551઀ଓ͸ΤϥʔʹͳΓ·͢ɻ

15. Πϯλʔωοτ؀ڥͷมԽ w (PPHMF͕ಠࣗʹ։ൃ͍ͯ͠Δϓϩτίϧ w 6%1্Ͱ5$1 5-4૬౰ ЋͷػೳΛ࣮ݱ w 355ʹΑΔߴ଎઀ଓ (PPHMFͰׂ߹

    w (PPHMFͷશαʔϏεͰӡ༻த w 'BDFCPPL͸ϞόΠϧΞϓϦͰ5$1্ͷ26*$҉ ߸Λࢼݧத w -*/&΋26*$ར༻Λࢼݧத ৽ϓϩτίϧ 26*$

16. Πϯλʔωοτ؀ڥͷมԽ 26*$ʹΑΔ355ʹΑΔߴ଎઀ଓ ҉߸Խ͞ΕͨΞϓϦͷσʔλ (&5)551 $)-0 ϋϯυγΣΠΫ લճར༻ͨ͠伴 ࠶઀ଓͷࡍʹ͸ϋϯυγΣΠΫ׬ྃΛ଴ͨͣɺҎલͷ઀ଓ Ͱར༻ͨ͠伴Λ࢖ͬͯΞϓϦσʔλΛ҉߸Խ͠ૹ৴͢Δ 4)-0

17. Πϯλʔωοτ؀ڥͷมԽ ͦͷଞ ಋೖίετͷ௿ݮ -FU`T&ODSZQUͷແྉ%7ূ໌ॻ ੑೳ޲্ "&4/*ʹΑΔ$16҉߸ॲཧೳྗͷ޲্ ΠϯϑϥෛՙͷมԽ )551ʹΑΔ઀ଓू໿ ఏڙαʔϏεͷଟ༷Խ Ϛϧνςφϯτ$%/

    ϒϥ΢βͷํ਑ 'JSFGPY ඇ҉߸Խ઀ଓͷஈ֊తഇࢭɺػೳ੍ݶͷํ਑

18. 5-4ͷݶք

19. 5-4ͷݶք w ݱࡏͷ5-4Ͱఆٛ͞Ε͍ͯΔز͔ͭͷػೳɾ߲໨ ͸ɺطʹແ৚݅Ͱར༻͢ΔͱةݥͰ͋Δɻ w 3'$ 5-4%5-4ͷ҆શͳར༻ͷͨΊͷਪ঑ʣ w աڈ༷ʑͳ5-4ͷ߈ܸख๏΍੬ऑੑ͕ެ։͞Εɺͦͷ ౓ରࡦ͕औΒΕ͖ͯͨɻ

    w ͔͠͠ػೳͷແޮԽ΍֦ுػೳͷ௥ՃͳͲBEIPDͳର ࡦͰࠜຊతɾൈຊతͳରࡦʹͳ͍ͬͯͳ͍΋ͷ΋ଟ͍ɻ

20. 5-4ͷݶք ҉߸ํࣜͷةຆԽ طʹे෼҆શͱ͸ݴ͑ͳ͍҉߸ํࣜͷαϙʔτ͕࢓༷ Ͱنఆ͞Ε͓ͯΓɺߋ৽͕ඞཁɻ %&4 /*45'14ͷഇࢭ ೥·Ͱڐ༰ 3$ 3'$ 1SPIJCJUJOH3$$JQIFS4VJUFT

    .% 4-05)߈ܸ $7& 4)" 'SFFTUBSU$PMMJTJPO

21. 5-4ͷݶք ҉߸ڧ౓ͷةຆԽ w '3&", MPHKBNɿղಡख๏ͷޮ཰Խɺܭࢉࢿݯͷߴ౓Խ ʹΑΓे෼҆શͱΈͳ͞ΕΔ҉߸ڧ౓͕ߴ͘ͳͬͨɻεϊʔ σϯࣄ݅ͰࠃՈ༧ࢉϨϕϧͷܭࢉࢿݯ΋ڴҖͱͳΔ࣌୅ɻ w /*4541"SFW &$3:15**ਪ঑ɿ֤छஂମʹ

    ΑΔࢦඪͱ5-4 3'$Ͱαϙʔτ͍ͯ͠Δ҉߸ͷ தʹCJUҎԼͷ&$%)ͳͲطʹڧ౓ෆ଍ͷ΋ͷؚ͕· Ε͍ͯΔɻ w /*45҉߸΁ͷٙٛɿ%VBM@&$@%3#(ͷόοΫυΞ໰୊

22. 5-4ͷݶք ҉߸ख๏ͷ҆શੑ w ."$UIFO&ODSZQU FH$#$NPEF ͷ҆શੑʹର͢Δٙ໰ w աڈ#&"451BEEJOH0SBDMF߈ܸ-VDLZ5IJSUFFO౳ͷ ߈ܸର৅ɻࠓޙ΋ग़ͯ͘Δ͜ͱ͕༧૝͞ΕΔɻ w

    #MPDL$JQIFSͷݶքɺ4USFBN$JQIFS 3$ ͷةຆԽ 5-4͸"&"% ೝূ͖ͭ҉߸ ͷΈ ҉߸Խ ฏจʴύσΟϯά ."$

23. 5-4ͷݶք 3FOFHPUJBUJPO w 5-4ϋϯυγΣΠΫ׬ྃޙʹ઀ଓΛҡ࣋ͨ͠··࠶ ౓ϋϯυγΣΠΫΛߦ͏ػೳɻΫϥΠΞϯτೝূ΁ ͷભҠ΍伴ߋ৽ͷͨΊʹඞཁɻ w աڈ͍Ζ͍Ζͳ߈ܸର৅ͱͳͬͨɻ3FOFHPUJBUJPO લޙͰηογϣϯͷҾ͖ܧ͕͗೉͍͜͠ͱ͕ىҼ 5-4Ͱഇࢭ

    ϋϯυγΣΠΫ ࠶ϋϯυγΣΠΫ

24. 5-4ͷݶք $PNQSFTTJPO w 5-4ͷσʔλΛѹॖ͔ͯ͠Β҉߸Խ͢Δػೳɻϋϯ υγΣΠΫ࣌ʹѹॖํࣜΛ߹ҙ͢Δɻ w ѹॖαΠυνϟωϧ߈ܸɿσʔλѹॖʹΑΔαΠ ζมߋΛख͕͔Γͱͯ͠҉߸Խ৘ใΛ࿙Ӯͤ͞Δख ๏ $3*.&5*.&#3&"$)

    5-4Ͱഇࢭ "Y """""""""

25. 5-4ͷݶք 4FTTJPO*% 5JDLFU w Ҏલͷ5-4ηογϣϯ৘ใΛҾ͖ܧ͍Ͱ࠶઀ଓΛߦ ͏ػೳ w ڞ༗ͷࡍͷ৚͕݅؁͍ͱೝূόΠύεͷ੬ऑੑ 5-4Ͱഇࢭ 14,

    1SF4IBSF,FZ ํࣜʹ౷Ұ 4FTTJPO*% 5JDLFU

26. 5-4ͷݶք 伴ަ׵ͷ$SPTT1SPUPDPM߈ܸ w .J5.Ͱ5-4ͷ&$%)伴ަ׵Λ%)伴ަ׵ʹΈͳͯ͠Ϋ ϥΠΞϯτʹૹ෇ͤ͞Δ߈ܸ w ?ఔ౓ͷ֬཰ͰQSFNBTUFSTFDSFUͷ伴ղಡ͕੒ޭ w 5-4Ͱ͸ύϥϝʔλʹΑΔ伴ަ׵Λഇࢭɻ໊લ෇͖ύϥ ϝʔλར༻ʹ੍ݶɺॺ໊Ληογϣϯϋογϡʹมߋͨ͠ɻ

    ηογϣϯϋογϡɿͦΕ·Ͱ΍ΓऔΓͨ͠શϋϯυγΣΠΫσʔλΛར༻ͯ͠ϋογϡ஋Λੜ੒͢Δํ๏ &$%)& 4FSWSFS,FZ&YDIBOHF %)& 4FSWSFS,FZ&YDIBOHF

27. 5-4ͷݶք ,FZ%FWJBUJPO w ϋϯυγΣΠΫσʔλ͔Βରশ҉߸ͷൿີ伴΍."$ 伴Λੜ੒͢Δํࣜ w 5SJQMF)BOETIBLF߈ܸɿ.J5.ͰOPODFΛૢ࡞ͯ͠ಉ ͡NBTUFSTFDSFUΛ࣋ͭ̎ͭͷ5-4઀ଓΛཱ֬ɻ 3FOFHPUJBUJPOΛ༠ൃͤͯ͞ѱҙͷ͋ΔσʔλΛૹΓ ࠐΉ߈ܸख๏

    5-4͸ηογϣϯϋογϡΛ༻͍ͨNBTUFSTFDSFUʹมߋ NBTUFSTFDSFU NBTUFSTFDSFU

28. 5-4ͱ͸Կ͔ʁ ࣌ؒͷ౎߹্໢ཏతɾৄࡉͳ࢓༷಺༰·Ͱ౿ΈࠐΈ·ͤΜ

29. 5-4ͷ໨త ϋϯυγΣΠΫσʔλΛͰ͖Δ͚ͩ҉߸Խͯ͠ൿಗ͢Δ ϋϯυγΣΠΫϨΠςϯγʔͷ࡟ݮ w ࠶઀ଓͷ৔߹͸355 w ৽ن઀ଓͷ৔߹͸ɺ355 355

    ϋϯυγΣΠΫͰަ׵͢Δ߲໨ͷݟ௚͠ɺ؆ૉԽ Ϩίʔυ૚҉߸Խͷݟ௚͠ 3$ഇࢭɺ$#$ෆ࠾༻౳

30. 5-4ͷಛ௃ ༷ʑͳػೳɺ߲໨ͷݟ௚͠ɾഇࢭ ࣌୅ʹ߹Θͳ͘ͳͬͨ΋ͷɺΑΓޮ཰తʹมߋमਖ਼Ͱ͖Δ΋ͷΛ 5-4͔Βػೳɾ߲໨Λ਺ଟ͘ഇࢭ ΑΓηΩϡΞʹ ฏจ௨৴͕ඞཁͳ෦෼Λۃྗগͳͯ͘͠৘ใΛൿಗ "&"%΍ύσΟϯάͳͲকདྷతͳ߈ܸʹඋ͑Δ

    ੑೳ޲্ 355 355઀ଓʹΑΔੑೳ޲্

31. ΋͏ϝδϟʔόʔδϣϯΞοϓͱಉ͡վม 5-4ͷओͳഇࢭ߲໨ ػೳ $PNQSFTTJPO $3*.&5*.&ରࡦ 3FOFHPUJBUJPO 1PTU)BOETIBLFʹஔ͖׵͑ 4FTTJPO*% 5JDLFU 14,ʹஔ͖׵͑

    ҉߸ํࣜ .% 4)" 4)" ةຆԽɺ௿ڧ౓ରࡦ %4" ར༻༻్ͷݮগ OPO"&"% $#$ 3$ ةຆԽɺ߈ܸϦεΫͷ௿ݮ *7ϑΟʔϧυ OPODF࠶ར༻ϦεΫͷഉআ DVTUPN%)& $SPTT1SPUPDPM߈ܸରࡦ &$%)&DPNQSFTTGPSNBU ར༻༻్ͷݟ௚͠ɺ؆ૉԽ BOPOZNPVT%) 3'$ SBXQVCLFZ Λ୅༻

32. ΋͏ϝδϟʔόʔδϣϯΞοϓͱಉ͡վม 5-4ͷओͳഇࢭ߲໨ ϋϯυγ ΣΠΫ SFDPSEMBZFSͷόʔδϣϯ ޙํޓ׵ͷͨΊ͚ͩʹҡ࣋ SBOEPNதͷ࣌ࠁσʔλ ཚ਺ੜ੒͕ߴ౓Խ͠ҙຯ͕ͳ͘ͳͬͨ 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༻ෆՄɺ҆શͰ͸ͳ͍

33. ͳͥ5-4͡Όͳ͍ͷ͔ w 44--BCͷௐࠪͰ͸ɺ5-4Ϩίʔυ૚ͷόʔδϣϯ͕ɺ ͷ৔߹͸ɺͷ৔߹͸Ҏ্ͷ5-4αʔό ͕઀ଓΛڋ൱͢Δɻ 0QFO44-ͷιʔε ΫϥΠΞϯτ͕5-4Y͕ΦϑΝʔͨ͠ ΒͱΓ͋͑ͣ5-4ͱͯ͠ѻ͏

34. 5-4WT ॳظ઀ଓܗଶͷҧ͍ɺߴ଎Խ ઀ଓ 5-4 5-4 355 /" ࠶઀ଓ14, ʢΫϥΠΞϯτೝূ͸ෆՄ 355

    /" ৽ن઀ଓ αʔόଆൃ৴ 355 ࠶઀ଓ ৽ن઀ଓ 355 ৽ن઀ଓ ҉߸ํࣜͷෆ߹ҙ࣌ ߴ଎Խ ߴ ଎ Խ 355͕ൺֱతେ͖͍ϞόΠϧ؀ڥͷੑೳվળ

35. 5-4ͷϋϯυγΣΠΫ 355 ClientHello ServerHello Certificate ServerHelloDone ClientKeyExchange ChangeCipherSpec Finished ChangeCipherSpec

    Finished Application Data Application Data 355 355 355 355 ҉߸Խൣғ ̎—355

36. 5-4ͷϋϯυγΣΠΫ 355 ClientHello ServerHello EncryptedExtension ServerConfiguration Certificate CertificateVerify Finished

    ApplicationData Finished Application Data Application Data 355 355 355 ҉߸Խൣғ 355 355

37. 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 355ͷσʔλ͸3FQMZ߈ܸରࡦͷͨΊσʔλͷႈ౳ੑ͕ඞཁɻ ઐ༻"1*Λ༻ҙͯ͠ΞϓϦଆͰ୲อ͢Δɻ

38. 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

39. 5-4ϗοτͳٞ࿦ &$ %)&355ͷෆ࠾༻ w 26*$Ͱ͸αʔό͔ΒTFNJTUBUJD伴Λ༧ΊΫϥΠΞϯτ ʹૹ෇͠ɺ355઀ଓ࣌ʹσʔλΛ҉߸Խ͢Δɻ w αʔόͷTFNJTUBUJD伴͸ΫϥΠΞϯτͰͷ؅ཧָ͕ w %/4ͰTFNJTUBUJD伴Λެ։͢Ε͹ॳظ઀ଓͰ΋355Ͱ

    ͖Δɻ HT HY 355҉߸Խσʔλ T ͇

40. 5-4ϗοτͳٞ࿦ &$ %)&355ͷෆ࠾༻ w TFNJTUBUJDൿີ伴͕ةຆԽͨ͠৔߹ʹ'PSXBSE4FDSFDZ͕ഁΒΕΔ w ٞ࿦ͷ݁Ռɺ &$ %)&CBTFE355͸ෆ࠾༻ʹ w

    14,ͷ3FTVNQUJPO͸ຖճNBTUFSTFDSFUΛߋ৽͢ΔͨΊ355͸14, ϞʔυͷΈར༻Մೳʹ HT T 355҉߸Խσʔλ T HY 355ฏจσʔλ

41. 5-4ͷϗοτͳٞ࿦ 34"144WT1,$4 w ೥Ҏ্ܦͭͷʹূ໌ॻͷॺ໊ํࣜ͸ɺ34"1,$4 ͔ΒΑΓ҆શͳ34"144΁ͷҠߦ͕શવਐΜͰ͍ͳ͍ɻ w 5-4Ͱ͸ɺϋϯυγΣΠΫॺ໊Λ34"144ͷΈʹ੍ ݶɻূ໌ॻʹ͍ͭͯ͸ݴٴͤͣɻ w ͜ͷ··ͩͱ34"144ͱ1,$4ͷซ༻͕ଓ͘ɻ

    w কདྷతʹඞਢ͔Ͱ͖Δ͔ʁΫϥΠΞϯτʔαʔόؒͰ֦ ு৘ใΛަ׵ͯ͠34"144͚ͩ࢖͑ΔΑ͏ʹͰ͖ͳ͍ ͔ɺҾ͖ଓ͖ݕ౼ɻ

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