メガネとBluetooth Low Energyでお喋りする

Kernel/VM 探検隊 online part4 で発表したスライドです。
https://kernelvm.connpass.com/event/225573/

コードやデモは以下にあります。
https://github.com/KOBA789/memex

この解析作業の模様は一部録画があります。合わせてご覧ください。
https://www.youtube.com/watch?v=9B1MZC_yb1g

Transcript

1. KOBA789
   ϝΨωͱ
   

   #MVFUPPUI-PX&OFSHZͰ
   

   ͓஻Γ͢Δ
   ͋Δ͍͸42-ͰύέοτΛղੳ͢Δํ๏
   

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2. KOBA789
   ͓͔͛͞·Ͱब৬͠·ͨ͠
   ‣ ࢓ࣄ
   ‣ 3VTUͰਓ޻Ӵ੕ͷιϑτ΢ΣΞΛॻ͍ͨΓ
   ‣ झຯ
   ‣ ࣗ࡞%#.4Λ࡞ͬͨΓ
   ‣ ϒϥ΢βͰಈ͘ి࣓ϦϨʔճ࿏$"%
   

   γϛϡϨʔλΛ࡞ͬͨΓ
   

   ʢ,FSOFM7.୳ݕୂPOMJOFQBSUͷͱ͖ͷωλʣ
   ‣ :PV5VCFS׆ಈΛ΍ͬͨΓ΍Βͳ͔ͬͨΓ
   

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3. ,0#"
   ϝΨωͱ
   

   #MVFUPPUI-PX&OFSHZͰ
   

   ͓஻Γ͢Δ
   ͋Δ͍͸42-ͰύέοτΛղੳ͢Δํ๏
   

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4. #-&Λ஻ΔϝΨω
   https://twitter.com/hikalium/status/1453308702560165888
   

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5. ਺೔ޙ
   

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6. #-&Λ஻ΔϝΨω
   ങͬͪͬͨ
   w ֤छηϯαʔ෇͖
   w Ճ଎౓ηϯαʔ
   w δϟΠϩηϯαʔ
   w ےిηϯαʔʢ·͹͖ͨͱ͔ʣ
   w 8FC4PDLFUͷ࢓༷͕ެ։͞Ε͍ͯΔ
   https://twitter.com/KOBA789/status/1454285016129687553
   

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7. #-&Λ஻ΔϝΨω
   ങͬͪͬͨ
   w ֤छηϯαʔ෇͖
   w Ճ଎౓ηϯαʔ
   w δϟΠϩηϯαʔ
   w ےిηϯαʔʢ·͹͖ͨͱ͔ʣ
   w 8FC4PDLFUͷ࢓༷͕ެ։͞Ε͍ͯΔ
   https://twitter.com/KOBA789/status/1454285016129687553
   

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8. #-&Λ஻ΔϝΨω
   ങͬͪͬͨ
   w ֤छηϯαʔ෇͖
   w Ճ଎౓ηϯαʔ
   w δϟΠϩηϯαʔ
   w ےిηϯαʔʢ·͹͖ͨͱ͔ʣ
   w 8FC4PDLFUͷ࢓༷͕ެ։͞Ε͍ͯΔ
   https://twitter.com/KOBA789/status/1454285016129687553
   🤔#-&Ͱ͸ͳ͍ͷ͔ʁ
   

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9. Ͳ͏͍͏͜ͱͩͬͯ͹Α
   ઐ༻ͷΞϓϦ͕#-&ͱ8FC4PDLFUΛϓϩΩγ͍ͯ͠Δ
   👓 📱 💻
   #MVFUPPUI-PX&OFSHZ
   ʢඇެ։ʣ
   8FC4PDLFU
   ʢެ։ʣ
   ઐ༻J04ΞϓϦ 84αʔόʔ
   

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10. ͓ͱͳ͘͠8FC4PDLFU࢖͑͹Α͘ͳ͍ʁ
    ͍΍ͳΜ͡Όʂ
    w J04ΞϓϦΛ࢖͏ͷ͕μϧ͍
    w ͓खܰͳΞόλʔ؀ڥ͕΄͍͠Μ͡Ό
    w ཧ૝తʹ͸.BD#PPL୆Ͱ׬݁ͯ͠΄͍͠
    w ͳΜ͔ᚒͳͷͰղੳ͍ͨ͠
    w ࢓༷ඇެ։༡ͼߕ൹͕͋Δ
    

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11. ͱ͍͏Θ͚Ͱղੳ͢Δ͜ͱʹ
    

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12. ͳʹ͸ͱ΋͋ΕύέοτΛΩϟϓνϟ
    ͔͠͠Ͳ͏΍ͬͯʁ
    w ެࣜͷΞϓϦͷ௨৴Λ೷͖͍ͨ
    w ͔͠͠ಈ࡞؀ڥ͸J04
    w 8JSF4IBSLͱ͔ͳ͍
    w ύέοτΩϟϓνϟͰ͖Δͷʁ
    

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13. J04Ͱͷ#-&ύέοτΩϟϓνϟ
    ࣮͸"QQMF७ਖ਼ͷ։ൃπʔϧͰͰ͖Δ
    w J04ଆʹ։ൃ༻ͷϓϩϑΝΠϧΛΠϯετʔϧ͢Δ
    w IUUQTEFWFMPQFSBQQMFDPNCVHSFQPSUJOHQSP
    fi
    MFTBOEMPHT
    w J1IPOFͱ.BD#PPLΛ64#έʔϒϧͰ઀ଓ͢Δ
    w NBD04ଆͰ1BDLFU-PHHFSΛىಈ͢Δ
    w "EEJUJPOBM5PPMTʹೖͬͯΔ
    w ύέοτ͕ͲΜͲΜྲྀΕͯ͘Δʂɹָ͍͠ʂʂ
    

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14. ׆͖ͷ͍͍ύέοτͷ༷ࢠ
    ઈົʹ࢖͍ͮΒ͍6*͕ͩɺͪΌΜͱ࠾औͰ͖Δ
    

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15. ύέοτ؍࡯
    ͳΜ͔༷ࢠ͕͓͔͍͠
    w #-&ͱ͍͑͹ɺ("55Ͱ஋͕
    

    $IBSBDUFSJTUJD͝ͱʹೖ͍ͬͯΔ͜ͱ͕ଟ͍
    w 9࣠ํ޲ͷՃ଎౓ͷ$IBSBDUFSJTUJDɺͷΑ͏ʹ
    w ͜ͷϝΨω͸ͭͷCZUFͷ$IBSBDUFSJTUJDʹ
    

    શ෦Λԡ͠ࠐΜͰ͍ΔΑ͏ͩ
    w ͦΕͧΕͷ஋͕ͲͷΦϑηοτʹೖ͍ͬͯΔͷ͔
    

    Θ͔ΒΜ
    

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16. 14 18 dd 6a 3f 6b 7f 6c 9b ff 88 6f c5 b4 61 41 30 9e 0a ab
    
    
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17. 14 18 dd 6a 3f 6b 7f 6c 9b ff 88 6f c5 b4 61 41 30 9e 0a ab
    
    
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    14 18 dd 5d 3f 6b 7f 6c 9b ff 88 6f c5 b4 61 41 31 e2 00 ab
    
    
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    14 18 dd 54 3f 6b 7f 6c 9b ff 88 6f c5 b4 61 40 31 99 03 ab
    
    
    
    
    γʔέϯε൪߸ͷΑ͏͕ͩɺ
    

    ୯ௐ૿Ճ͡Όͳ͍
    

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18. 14 18 dd 6a 3f 6b 7f 6c 9b ff 88 6f c5 b4 61 41 30 9e 0a ab
    
    
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    Ճ଎౓ηϯαʔͷ஋ͬΆ͍͕ɺ
    

    ࣠ͳͷʹCZUFʁ
    

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19. ղੳͷ࣌ؒͩʂ
    

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20. ղੳͷํ਑
    جຊ͸໨ྗ
    w ͳΜΒ͔ͷ஋͕903͞ΕͯͨΓͦ͠͏͕ͩɺ
    

    ͦΜͳʹ೉͍͜͠ͱ͸͍ͯ͠ͳ͍͸ͣ
    w ϝΨωʹຒΊࠐΊΔαΠζͷϓϩηοαͰ
    

    Ͱ͖Δ͜ͱʹ͸ݶք͕͋Δ
    w 8FC4PDLFUͷσʔλͱಉ࣌ʹΩϟϓνϟͯ͠ɺ
    

    ԣʹฒ΂ͯάοͱᛀΉ
    

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21. Ωϟϓνϟ͢Δ΍ͭΛ࡞Δ
    8FC4PDLFUฤ
    w /PEFKTͰࡶʹॻ͘
    w ʢ׬ʣ
    

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22. Ωϟϓνϟ͢Δ΍ͭΛ࡞Δ
    #MVFUPPUI-PX&OFSHZฤ
    w ಉ࣌ʹΩϟϓνϟ͢Δͱ͍͏͜ͱ͸ɺ
    

    J04Ͱ΍Δ͔͠ͳ͍
    w ͭ·Γ1BDLFU-PHHFS͔͠ͳ͍
    w 1BDLFU-PHHFS͸Ωϟϓνϟ݁ՌΛอଘͰ͖Δ
    w CUTOPPQܗࣜ
    

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23. CUTOPPQ
    ύέοτΩϟϓνϟͷه࿥ܗࣜ
    w ύʔεͰ͖ΔϥΠϒϥϦΛ୳͚ͨ͠Ͳແ͔ͬͨ
    w ࢓ํͳ͍ͷͰࣗྗͰύʔε
    w ݻఆ௕ͷϑΝΠϧϔομͷ͋ͱʹɺ
    

    Մม௕ͷϨίʔυ͕ฒͿ͚ͩ
    w 3VTUͰద౰ʹॻ͍ͨΒ͙͢Ͱ͖ͨ
    

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24. ద౰ͳμϯϓ͕ಘΒΕͨ
    ద౰ͳ8FC4PDLFUμϯϓʢ+40/ʣ ద౰ͳ#-&μϯϓʢ$47ʣ
    

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25. ໨ྗΛ׆༻͢Δʹ͸ՄࢹԽ͕େࣄ
    Ͳ͏΍ͬͯՄࢹԽ͢Δ͔
    w ,0#"͸1ZUIPO͕ॻ͚ͳ͍
    

    ʢॻ͖ͨ͘ͳ͍ʣ
    w NBUQMPUMJCͱ͔࢖͑ͳ͍
    w 42-ͷΤίγεςϜʹ͸
    

    ศརͳՄࢹԽπʔϧ͕͍ͬͺ͍
    w ͖ͬ͞ͷμϯϓΛ42-%#ʹ
    

    ೖΕΕ͹͍͍ͷͰ͸ʁ
    

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26. #EBTI
    &MFDUSPO੡ͷ͓खܰμογϡϘʔυΞϓϦ
    w IUUQTHJUIVCDPNCEBTIBQQCEBTI
    w ͱʹ͔͘άϥϑ͕ࡶʹඳ͚Δ
    

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27. άϥϑΛඳ͍ͯோΊΔ
    w ૒ํʹߦ൪߸Λ෇༩ͨ͠ͷͰɺ
    

    ͦΕͰ+0*/
    w ͜ΕҐ૬߹ͬͯΜͷ͔ʁ
    w Ωϟϓνϟ։࢝λΠϛϯά͕
    

    ἧͬͯͳ͍ͷͰઈର߹ͬͯͳ͍
    

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28. άϥϑͷҐ૬Λἧ͑Δ
    ͳʹΛ໨ҹʹҐ૬Λἧ͑Δ͔
    w ·͹͖ͨͨ͠ͱ͖͚ͩมԽ͢ΔΦΫςοτ͕͋Δ
    w ϫϯγϣοτͳͷͰҐ૬߹Θͤʹ࢖͍΍͍͢
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29. ·͹͖ͨͬΆύϥϝʔλΛՄࢹԽ
    ஋ͷେখ͸ͱ΋͔͘ɺͪΐͬͱಈ͔ͨ͠ΒॏͳΓͦ͏
    

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30. Ґ૬͕ἧͬͨͷͰάοͱᛀΜͰ͍͘
    ·ͣ͸γʔέϯε൪߸
    w 8FC4PDLFUଆͷγʔέϯε൪߸ͱ#-&ଆͷγʔέϯε൪߸ͬΆ͍
    

    ΦΫςοτΛฒ΂Δ
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    w 903ͬΆ͍
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    w ิ਺ʁ
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    w 5IBOLT!YSFLLVTV
    

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31. Ճ଎౓ͷϏοτ਺Λௐ΂Δ
    όΠτʹ࣠ऩΊ͍ͯΔՄೳੑ͕͋Δ
    w ϝΨωΛ੩ஔ͢Δ
    w ॏྗՃ଎౓ΛಘΔ
    w ϊΠζʹΑΔ༳Β͔͗Β෼ղೳΛಘΔ
    w ϝΨωΛڧ͘ৼΓճ͢
    w ࠷େ஋ΛಘΔ
    w CJUͬΆ͍ͱ͍͏͜ͱ͕Θ͔Δ
    w ΍ͬͺΓόΠτʹԡ͠ࠐΜͰΔ
    

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32. όΠτͷ಺༁Λௐ΂Δ
    ͜͏͍͏ͱ͖ʹ42-͕ศརͳΜͰ͢Α
    w ੜͷ஋͕มԽ͍ͯ͠ͳ͍ͷʹ
    

    903͞Εͨ஋͕มԽ͢Δ͜ͱ͸ͳ͍
    w ࣠͋ͨΓCJUͳͷͰɺ
    

    CJUΞϥΠϯ͞Ε͍ͯΔ͜ͱΛظ଴͢Δ
    w ͢΂ͯͷ૊Έ߹ΘͤͰ
    

    ୯ࣹͷؔ܎ʹ͋ΔϏοτྻΛ୳͢
    

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33. 9࣠ͷ্CJU͕Ͳ͜ʹ૬౰͢Δ͔ௐ΂Δ
    9࣠ͷੜͷ஋Ͱɺ903͞Εͨ஋Λ(3061#:
    w ͡Όͳ͍஋͕͋Δྻ͸
    

    9࣠ͱؔ܎ແ͍ྻ
    

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34. ؔ܎ͷ͋Δྻ͕ߜΓࠐΊͨΒϒϧʔτϑΥʔε
    ,0#"͸਺ֶ͕Ͱ͖ͳ͍
    w y=(x^a)+b というエンコードを期待する
    
    
    w ͨ͘͞Μͷ Y Z
    ͷ૊͔ΒB CΛٻΊΔ
    w ࿈ཱํఔࣜͱͯ͠ղ͚ͦ͏ͳؾ΋͢Δ
    w ߴʑͷ୳ࡧൣғͳͷͰྗۀͰղ͘
    for (let a = 0; a < max; a ++) {
    
    
    for (let b = 0; b < max; b ++) {
    
    
    if (constraints.every(([o, e]) => (((o ^ a) + b) % max) === e)) {
    
    
    console.log(a, b);
    
    
    }
    
    
    }
    
    
    }
    

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35. Ճ଎౓ηϯαʔͷ஋Λ
    

    खʹೖΕ·ͨ͠🎉
    

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36. ΊͰͨ͠ΊͰͨ͠ʁ
    

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37. #-&Ͱ͓͠Ό΂Γ
    

    Ͱ͖ΔΑ͏ʹͳͬͨͷͰ
    

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38. #-&Ͱ௨৴͢ΔΞϓϦΛ
    ॻ͖͍ͨ
    

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39. #MVF;
    

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40. $PSF#MVFUPPUI
    

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41. 8FC#MVFUPPUI
    

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42. 8FC#MVFUPPUI
    ΢Σϒϒϥ΢βͰ#MVFUPPUI-PX&OFSHZ͕஻ΕΔʂ
    w ϒϥ΢βͰϝΨωͱ͓͠Ό΂Γ͢Δͧʂ
    w ྫʹΑͬͯ'JSFGPY͸৐ΓؾͰͳ͍
    w ΢Σϒඪ४ʹͳΔ͔͸͔ͳΓո͍͚͠Ͳɺ
    

    ༡Ϳ͚ͩͳΒ͍͍Ͱ͠ΐ͏
    

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43. σϞ
    https://github.com/KOBA789/memex
    

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