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いっしー
October 17, 2019
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準同型暗号
いっしー
October 17, 2019
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Transcript
Blockchain Kyoto #18 2019/10/17 @גࣜձࣾϋευΡ
1. ΈΜͳͰࣗݾհ 2. ൃද ɾ४ಉܕ҉߸ʢ͍͠ͷʣ ɾಠࣗϒϩοΫνΣʔϯͰ࡞ΔٻॻγεςϜʢߥా͞Μʣ ɾϢʔεέʔεΛٞ͠Α͏ 3. ҿΈձ Blockchain
Kyoto #18
Blockchain Kyoto #18 ʮ४ಉܕ҉߸ʯ 2019/10/17 @גࣜձࣾϋευΡ
ੴ ൏ޔʢIshino Shungoʣ ϑϦʔϥϯεWEBΤϯδχΞ ࣗݾհ
• ҉߸Խͨ͠··ԋࢉ͕Ͱ͖Δ҉߸ٕज़ • ʮΛΧϓηϧʹೖΕΔૢ࡞ʯΛ҉߸Խͱ͢Δͱɺ ΧϓηϧʹೖΕͨ··ܭࢉ͕Ͱ͖Δɻ ४ಉܕ҉߸
४ಉܕ҉߸ • ҉߸Խͨ͠··ԋࢉ͕Ͱ͖Δ҉߸ٕज़ • ४ಉܕࣸ૾
• ޫ࣎ੜʢ@herumiʣ • ʮΫϥυΛࢧ͑Δ͜Ε͔Βͷ҉߸ٕज़ʯͷஶऀ • https://herumi.github.io/she-wasm/she- demo.html σϞ
ϒϩοΫνΣʔϯͩͱ ύϒϦοΫͳϒϩοΫνΣʔϯͩͱϓϩάϥϜ ίʔυετϨʔδͷσʔλશͯެ։͞Ε͍ͯ Δɻ →ใอޢ͕ඞཁͳαʔϏε͕Ͱ͖ͳ͍ɻ ४ಉܕ҉߸Λ͏ͱՄೳɻ
ҰൠతͳαʔϏεͰ • Ϣʔβʔ͔Βड͚औͬͨσʔλΛαʔόʔͰ҉ ߸จͷ··ॲཧͰ͖Δɻ • αʔϏεఏڙऀੜͷݸਓใΛ࣋ͨͳͯ͘ྑ ͍ɻ • Ϣʔβʔ҆৺
• Ճ๏४ಉܕ҉߸ʢପԁElGamalɺLifted-ElGamalʣ ҉߸Խͨ͠··͠ࢉ͕Ͱ͖Δɻ • ๏४ಉܕ҉߸ʢRSAɺElGamalʣ ҉߸Խͨ͠··ֻ͚ࢉ͕Ͱ͖Δɻ • શ४ಉܕ҉߸ʢ2009ʙʣ ҉߸Խͨ͠··͠ࢉͱֻ͚ࢉ͕Ͱ͖Δɻ ४ಉܕ҉߸
0ͱ1ͷੈքͰɺ͠ࢉʢXORʣͱֻ͚ࢉʢANDʣ ͷ྆ํ͕Ͱ͖ΔͱҙͷؔΛߏஙͰ͖Δɻ શ४ಉܕ҉߸͕શͱݴΘΕΔॴҎɻ ४ಉܕ҉߸
º ɾ͠ࢉʢXORʣ ɾֻ͚ࢉʢANDʣ
• ପԁElGamal҉߸ Ճ๏४ಉܕ҉߸ ɿฏจ ɿൿີ伴 ପԁۂઢ্ͷ ͱ Λެ։伴ͱ͢Δɻ
• ପԁElGamal҉߸ Ճ๏४ಉܕ҉߸
Ճ๏४ಉܕ҉߸ • ͠ࢉͰࣄΓΔԋࢉ··͋Δɻ • ॲཧͦͦ͜͜ʹૣ͍ɻ • े࣮༻తɻ
• ֨ࢠ҉߸ͱLWE • Somewhat ४ಉܕ҉߸ • ๏ͷճʹ੍ݶ͕͋Δɻ શ४ಉܕ҉߸
४ಉܕ҉߸ͷൺֱ
·ͱΊ • ४ಉܕ҉߸Λհ͠·ͨ͠ɻ • Ճ๏४ಉܕ҉߸े࣮༻తɻ • શ४ಉܕ҉߸·࣮ͩ༻ஈ֊Ͱͳ͍͕ɺΜ ʹݚڀ͕͞Ε͍ͯΔɻ
ࢀߟ https://herumi.github.io/ango/ https://www.youtube.com/watch?v=7IElG0ly2oU&t=1659s