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Blockchain Attack

shigahi
February 02, 2018

Blockchain Attack

社内ブロックチェーン勉強会

shigahi

February 02, 2018
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  1. ௿଎Ͱ҆શͰݎ࿚ͳσʔλϕʔε τϥϯβΫγϣϯͷϒϩʔυΩϟετ ϒϩοΫ΁ͷτϥϯβΫγϣϯͷऔΓࠐΈ ϒϩοΫͷϒϩʔυΩϟετ νΣʔϯ΁ͷ઀ଓ ϒϩοΫνΣʔϯͷఆண ϊʔυ / ΫϥΠΞϯτ ϊʔυ

    / ϚΠφʔ ϊʔυ / ΫϥΠΞϯτ ϊʔυ / ΫϥΠΞϯτ ܭࢉڝ૪ʹউͬͨੈքͰҰͭͷϊʔυ͕ ϒϩοΫΛੜ੒͠ɺTXΛ֨ೲ͢Δɻ ϒϩοΫΛ͢΂ͯͷϊʔυʹ͹Β·͘ɻ ͢΂ͯͷϊʔυ͕ݕࢉ͠ɺલͷϒϩοΫ ͱ੔߹ੑ͕औΕ͍ͯΔ΋ͷΛνΣʔϯ΁ ઀ଓ͢Δɻ ࠷΋௕͍νΣʔϯΛ৴༻͢Δ΋ͷͱ͠ɺ ࣌ؒͷܦաͱͱ΋ʹෆՄٯੑ͕ߴ·Δɻ
  2. ϏοτίΠϯͷهாํ๏ τϥϯβΫγϣϯࢦ޲੍࣌ࣜࡾࣜ฽ه τϥϯβΫγϣϯ Πϯϓοτ Ξ΢τϓοτ CUD τϥϯβΫγϣϯ Πϯϓοτ Ξ΢τϓοτ CUD

    τϥϯβΫγϣϯ Πϯϓοτ Ξ΢τϓοτ CUD τϥϯβΫγϣϯ Πϯϓοτ Ξ΢τϓοτ CUD CUD CUD CUD CUD CUD CUD CUD CUD τϥϯβΫγϣϯ 6590 CUD τϥϯβΫγϣϯ 6590 CUD τϥϯβΫγϣϯ 6590 CUD τϥϯβΫγϣϯ 6590 CUD
  3. τϥϯβΫγϣϯͱϒϩοΫͱνΣʔϯͷؔ܎ ϒϩοΫߴ  ϒϩοΫߴ  ϒϩοΫߴ  ௚લͷ ϒϩοΫϋογϡ ௚લͷ

    ϒϩοΫϋογϡ ௚લͷ ϒϩοΫϋογϡ 1P8 1P8 1P8 ϒϩοΫ಺59ͷ ϋογϡ ϒϩοΫ಺59ͷ ϋογϡ ϒϩοΫ಺59ͷ ϋογϡ ίΠϯϕʔε ίΠϯϕʔε ίΠϯϕʔε *OQVUCUD0VUQVUCUD *OQVUCUD0VUQVU CUD *OQVUCUD0VUQVUCUD 59 59 59 *OQVUCUD0VUQVUCUD *OQVUCUD0VUQVUCUD *OQVUCUD0VUQVUCUD 59 59 59 ɾɾɾɾɾɾ ɾɾɾɾɾɾ ɾɾɾɾɾɾ
  4. ࠷௕ͷνΣʔϯ͕ਖ਼౰ #MPDL #MPDL #MPDL #MPDL #MPDL 400004ͷ֬ೝ਺: 3 400004ͷ֬ೝ਺: 2

    400004ͷ֬ೝ਺: 1 ϒϩοΫͷ֬ೝ਺͕૿͑Δ = ޙଓͷνΣʔϯ͕௕͍ ޙଓͷνΣʔϯ͕௕͍ = ͦͷϒϩοΫΛվ͟Μ͢Δ࡞ۀྔ͕૿͑Δ
  5. ϚΠχϯάͷ࣮ࡍ • ϋογϡؔ਺ܭࢉ • ࣮ࡍ͸࿈ଧڝ૪ • ݩʑ͸ϊʔυ͕ϚΠχϯά • ઐ༻ιϑτˠGPU→ASIC •

    2006ϒϩοΫ͝ͱʹ೉қ౓ௐ੔ʢ2िؒʣ • 210000ϒϩοΫ͝ͱʹใु͕൒ݮʢ4೥ʣ • 2140೥͝Ζ࠷খσϊϛʹ౸ୡ͠21Mbtcͷ࠾۷͕ऴྃ
  6. &UIFSFVNͷ৔߹ • τϥϯβΫγϣϯࢦ޲Ͱ͸ͳ͘ΞΧ΢ϯτࢦ޲Ͱ࣮૷͕୯७ɻ • ϒϩοΫੜ੒࣌ؒ͸15 - 20ඵɻ • ϒϩοΫαΠζ͸ՄมͰ্ݶ΋Լݶ΋ͳ͍ɻ •

    ௨՟ൃߦ্ݶ͕ܾ·͓ͬͯΒͣɺϏοτίΠϯΑΓ΋ΠϯϑϨ͢Δɻ • εϚʔτίϯτϥΫτɺ෼ࢄΞϓϦέʔγϣϯ(ÐApp)Λࢪߦɺ࣮ߦ͢Δϫʔϧυ ίϯϐϡʔλͰ͋Δɻ • τϥϯβΫγϣϯͷதʹίϯτϥΫτίʔυؚ͕·ΕΔɻ • ΧελϜτʔΫϯʹΑΔ௨՟ൃߦ͕͸͡Ί͔Β૝ఆ͞Ε͍ͯΔɻ • ϕϧϦϯ͕ຊ৔ɻ • ϓϩδΣΫτʹॳظ͔Βʢͱ͍ͬͯ΋2೥΄ͲʣؔΘ͍ͬͯΔਓ͸ΈΜͳ͓ۚ࣋ͪ ͳͷͰɺاۀ͕ΤϯδχΞΛ֬อ͢Δͷ͕೉͍͠ɻ
  7. ΞϓϦέʔγϣϯ ϥΠϒϥϦ &UIFSFVN$MJFOU ϒϩοΫνΣʔϯ &UIFSFVNͷΞʔΩςΫνϟ ίϯτϥΫτ τϥϯβΫγϣϯ 8431$  +40/31$

     8FCKT &/* ³"QQ ϒϥ΢β ΢ΥϨοτ &UIFSFVN $MJFOU &UIFSFVN $MJFOU &UIFSFVN $MJFOU ϒϥ΢β .JTU 1BSJUZ .&8 ΫϥΠΞϯτ (FUI 1BSJUZ ίϯτϥΫτ։ൃݴޠ 4PMJEJUZ όΠτίʔυ࣮ߦ؀ڥ &7. ϗεςουɾϊʔυ .FUBNBTL *OGVSB &UIFSFVN-JTUFOJOH1PSU 5$16%1