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Blockchain Attack
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shigahi
February 02, 2018
Business
1
47
Blockchain Attack
社内ブロックチェーン勉強会
shigahi
February 02, 2018
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Transcript
ϒϩοΫνΣʔϯΦʔϧϨϯδ߈ܸ C.C. ΅ʔ͋ 29.01.2018 Shigahi
ϓϥΠϕʔτΩʔͰཪ͚ΒΕ͍ͯͳ͍҉߸௨՟ ͋ͳͨͷͷͰͳ͍Կ͔Ͱ͢ɻ
ϕϧϦϯΦϑΟεͷϒϩοΫνΣʔϯͷऔΓΈ • ύϒϦοΫ͔ͭΦʔϓϯͳٕज़ͰϒϩοΫνΣʔϯͦͷͷͱपลαʔ ϏεΛߏங͢Δɻ • bitcoinओʹύϒϦοΫͳϚΠΫϩϖΠϝϯτܾࡁɺethereumε ϚʔτίϯτϥΫτ͓ΑͼτʔΫϯτϥϯβΫγϣϯΛओ؟ʹஔ͘ɻ • btcɺeth։ൃͰͷΈ༻ɺফඅ͠ɺࢿରͱ͠ͳ͍ɻ •
ϑΟΞοτ௨՟ͷϖΠϝϯτGWΛߏங͢ΔՄೳੑ͋ΕͲɺن੍Λ ड͚ΔऔҾॴࢦ͞ͳ͍ɻ
Attention ϒϩοΫνΣʔϯʹ͍ͭͯɺθϩ͔Βઆ ໌͠·͢ɻ ͱ͍͑ɺΤϯδχΞ͕͖͍͖ͯͳ ͍Α͏ʹ࣮ྫΛަ͑·͢ɻ ͳͷͰ͕ൃࢄ͢Δͱࢥ͍·͢ɻ ͕ࣗࠓ͍ͬͯΔίϨʹͬͨΒ໘ന ͦ͏ͱࢥ͍͚ͬͯͨͩͨΒ͍Ͱ͢ɻ
ϒϩοΫνΣʔϯͱɺ σʔλϕʔεͰ͢ɻ ࢄͨ͠ Ͱ ҆શͰ ݎ࿚Ͱ ୭ཧ͠ͳ͍
ࢄͨ͠୭ཧ͠ͳ͍σʔλϕʔε ϊʔυͯ͢ͷτϥϯβΫγϣϯσʔλΛอ࣋͢Δɻ TXϒϩʔυΩϟετɻ ͋ͪΒଆ͕ͳ͍ੈքɻ 1ϊʔυ͕ϒϩοΫੜɻ ΈΜͳͰνΣʔϯଓɻ
Ͳͷ͘Β͍ࢄ͍ͯ͠Δ͔
Ͱ҆શͰݎ࿚ͳσʔλϕʔε τϥϯβΫγϣϯͷϒϩʔυΩϟετ ϒϩοΫͷτϥϯβΫγϣϯͷऔΓࠐΈ ϒϩοΫͷϒϩʔυΩϟετ νΣʔϯͷଓ ϒϩοΫνΣʔϯͷఆண ϊʔυ / ΫϥΠΞϯτ ϊʔυ
/ ϚΠφʔ ϊʔυ / ΫϥΠΞϯτ ϊʔυ / ΫϥΠΞϯτ ܭࢉڝ૪ʹউͬͨੈքͰҰͭͷϊʔυ͕ ϒϩοΫΛੜ͠ɺTXΛ֨ೲ͢Δɻ ϒϩοΫΛͯ͢ͷϊʔυʹΒ·͘ɻ ͯ͢ͷϊʔυ͕ݕࢉ͠ɺલͷϒϩοΫ ͱ߹ੑ͕औΕ͍ͯΔͷΛνΣʔϯ ଓ͢Δɻ ࠷͍νΣʔϯΛ৴༻͢Δͷͱ͠ɺ ࣌ؒͷܦաͱͱʹෆՄٯੑ͕ߴ·Δɻ
ϏοτίΠϯͷهாํ๏ τϥϯβΫγϣϯࢦ੍࣌ࣜࡾࣜه τϥϯβΫγϣϯ Πϯϓοτ Ξτϓοτ CUD τϥϯβΫγϣϯ Πϯϓοτ Ξτϓοτ CUD
τϥϯβΫγϣϯ Πϯϓοτ Ξτϓοτ CUD τϥϯβΫγϣϯ Πϯϓοτ Ξτϓοτ CUD CUD CUD CUD CUD CUD CUD CUD CUD τϥϯβΫγϣϯ 6590 CUD τϥϯβΫγϣϯ 6590 CUD τϥϯβΫγϣϯ 6590 CUD τϥϯβΫγϣϯ 6590 CUD
τϥϯβΫγϣϯͱϒϩοΫͱνΣʔϯͷؔ ϒϩοΫߴ ϒϩοΫߴ ϒϩοΫߴ લͷ ϒϩοΫϋογϡ લͷ
ϒϩοΫϋογϡ લͷ ϒϩοΫϋογϡ 1P8 1P8 1P8 ϒϩοΫ59ͷ ϋογϡ ϒϩοΫ59ͷ ϋογϡ ϒϩοΫ59ͷ ϋογϡ ίΠϯϕʔε ίΠϯϕʔε ίΠϯϕʔε *OQVUCUD0VUQVUCUD *OQVUCUD0VUQVU CUD *OQVUCUD0VUQVUCUD 59 59 59 *OQVUCUD0VUQVUCUD *OQVUCUD0VUQVUCUD *OQVUCUD0VUQVUCUD 59 59 59 ɾɾɾɾɾɾ ɾɾɾɾɾɾ ɾɾɾɾɾɾ
࣮ࡍͷτϥϯβΫγϣϯ
ෆਖ਼ͷํ๏ ૹۚऀ ϚΠφʔ = डऔऀ CUDૹۚ59ΛϒϩʔυΩϟετ #MPDL ಉҰ6590 #MPDL #MPDL
CUDૹۚ59ΛϒϩʔυΩϟετ ϒϩοΫΛଓ
࠷ͷνΣʔϯ͕ਖ਼ #MPDL #MPDL #MPDL #MPDL #MPDL 400004ͷ֬ೝ: 3 400004ͷ֬ೝ: 2
400004ͷ֬ೝ: 1 ϒϩοΫͷ֬ೝ͕૿͑Δ = ޙଓͷνΣʔϯ͕͍ ޙଓͷνΣʔϯ͕͍ = ͦͷϒϩοΫΛվ͟Μ͢Δ࡞ۀྔ͕૿͑Δ
ϚΠχϯάͷ࣮ࡍ • ϋογϡؔܭࢉ • ࣮ࡍ࿈ଧڝ૪ • ݩʑϊʔυ͕ϚΠχϯά • ઐ༻ιϑτˠGPU→ASIC •
2006ϒϩοΫ͝ͱʹқௐʢ2िؒʣ • 210000ϒϩοΫ͝ͱʹใु͕ݮʢ4ʣ • 2140͝Ζ࠷খσϊϛʹ౸ୡ͠21Mbtcͷ࠾۷͕ऴྃ
%POPUUSVTU WFSJGZ • ωοτϫʔΫͷ୭৴༻͢Δඞཁ͕ͳ͍ɻ • ήʔϜཧతʹεςʔΫϗϧμʔͷར͕ؔφογϡۉߧ͍ͯ͠Δɻ • ίϯηϯαεϧʔϧʹνϟϨϯδ͢ΔΑΓैͬͨ΄͏͕߹ཧతɻ
Χοί͚͔ͭͯͬͯͳ͍ਓʹͳΒͳ͍Α͏ʹ • ϒϩοΫνΣʔϯٕज़ૉΒ͍͕͠ɺϏοτίΠϯո͍͠ɺڵຯ ͕ͳ͍ɻɹˡ ͔ͬͯͳ͍ਓ • ϒϩοΫνΣʔϯ ʹ ϏοτίΠϯͰɺ௨՟ͱͯ͠Ձ͕ͳ͚Εωο τϫʔΫҡ࣋͞Εͳ͍ɻ
• ϏοτίΠϯͷՁอଘ͕ͳ͚Εɺ΄͔ͷϒϩοΫνΣʔϯ௨՟ ٕज़ଘଓͰ͖ͳ͍ɻ
͔ͬͨςΠͰมͳ͜ͱΛݴ͍ͩ͞ͳ͍Α͏ʹ • ϒϩοΫνΣʔϯΠϯλʔωοτҎདྷͷൃ໌ͰੈքΛม͑Δٕज़ͩɻ طଘ௨՟ۦஞ͞ΕΔɻɹˡ มͳ͜ͱݴ͍ग़͢ਓ • طଘͷσʔλϕʔεٕज़Λସ͢ΔͷͰͳ͘ɺੑೳΑΓ੍Ͱ ֵ৽తͳٕज़ɻ • اۀ͕͏ΞϓϦέʔγϣϯʹແཧ͘Γ͏Α͏ͳͷͰͳ͘ɺެ
ڞੑ͕ߴ͍ͰӬଓੑ͕ඞཁͳ߹ͷσʔλϕʔεͱͯ͠͏ํ͕ ͍͍ͯΔɻ
&UIFSFVNͷ߹ • τϥϯβΫγϣϯࢦͰͳ͘ΞΧϯτࢦͰ࣮͕୯७ɻ • ϒϩοΫੜ࣌ؒ15 - 20ඵɻ • ϒϩοΫαΠζՄมͰ্ݶԼݶͳ͍ɻ •
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ΞϓϦέʔγϣϯ ϥΠϒϥϦ &UIFSFVN$MJFOU ϒϩοΫνΣʔϯ &UIFSFVNͷΞʔΩςΫνϟ ίϯτϥΫτ τϥϯβΫγϣϯ 8431$ +40/31$
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