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なぜ平文パスワードはNGなのか / Why are plain passwords evil?
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Pudding
March 29, 2019
Technology
1
190
なぜ平文パスワードはNGなのか / Why are plain passwords evil?
近年話題の平文パスワード.流出していなくても大きく報道されるのは何故なのでしょうか.また,平文で保存しないためにどういった機構が採用されているのでしょうか.簡単にまとめました.
Pudding
March 29, 2019
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Transcript
ͳͥฏจύεϫʔυ /(ͳͷ͔ QVEEJOH 1
ʂ ࠷ۙɼ ʮฏจύεϫʔυʯ ͕Α͘χϡʔεʹͳ͍ͬͯΔ 2
3 IUUQTUFDIOJLLFJCQDPKQBUDMOYUNBHOD
4 IUUQTXXXJUNFEJBDPKQFOUFSQSJTFBSUJDMFTOFXTIUNM
? ʮฏจʯͬͯԿʁ 5
ʮฏจʯ 6 ˔ ʮͻΒͿΜʯ·ͨʮ͍ͿΜʯ ˔ ҉߸ԽͳͲ͕ࢪ͞Ε͍ͯͳ͍จࣈྻ ˔ 8FCͷจ຺ʹ͓͍ͯϢʔβͷೖྗͦͷ··ͷจࣈྻͱ ߟ͑ͯྑ͍ ˔
ฏจύεϫʔυͭ·ΓɼϢʔβ͕ೖྗͨ͠ύεϫʔυΛ ͦͷ··อଘͯ͠ೝূʹ༻͍ͯ͠Δɼͱ͍͏͜ͱ
? ͳͥฏจύεϫʔυ ʢྲྀग़͍ͯ͠ͳͯ͘ʣ μϝͳͷʁ 7
ฏจύεϫʔυͰఆ͞ΕΔ͜ͱ 8 ˔ ྲྀग़ͨ͠ͱ͖ͷӨڹ͕େ͖͍ ˓ ύεϫʔυͷ͍ճ͠ଟ͍ʢଞαʔϏεʹӨڹʣ ˓ ϩάΠϯ͞ΕΔͱΒΕ์ʢউखʹΛങ͏ʣ ˔ ࣾһʹύεϫʔυΛѲ͞ΕΔ
˓ ݟͣΒͣͷଞਓ͕ࣗͷ ΞΧϯτʹϩάΠϯՄೳ͔ Εͳ͍ ˔ ௨ৗͷݸਓใʹൺͯ୯ͳΔྲྀग़ʹ ཹ·Βͳ͍ඃʹͳΓಘΔ
? Ͳ͏ͬͯϢʔβͷ ύεϫʔυ͕ਖ਼͍͜͠ͱΛ ͔֬Ί͍ͯΔͷʁ 9
10 ԿΒ͔ͷख๏ Ϣʔβ͔Βͷೖྗ ݩͷจࣈྻΛ༰қʹ ਪఆͰ͖ͳ͍จࣈྻ TEGBTEIPTJEG IPHF Ϣʔβ͔Βͷೖྗ IPHF TEGBTEIPTJEG
0,
ϋογϡԽ 11 ˔ ϋογϡؔͱɼҙͷσʔλ͔Βܾ·ͬͨσʔλ ͷෆنଇͳΛग़ྗ͢Δؔ ˓ ͋Δจࣈྻ͔Βৗʹಉ͕͡ग़ྗ͞ΕΔ ˓ ग़ྗ͞Ε͔ͨΒݩͷจࣈྻΛਪଌ͢Δ͜ͱ͕ ʢൺֱతʣ͍͠
˔ σʔλϕʔεʹϋογϡԽͨ͠จࣈྻͷΈΛอଘ͓͖ͯ͠ Ϣʔβͷೖྗͨ͠ύεϫʔυΛಉ͡ํ๏ͰϋογϡԽ͠ɼ Ұக͢Εೝূޭ
ιϧτ 12 ˔ ϋογϡԽ͚ͩͰ·ͩऑ͍ ˓ ํ๏ʹΑͬͯղಡ͞ΕΔՄೳੑ༗Γ ˓ $3:153&$/*45ͷਪ͢Δख๏Λ͓͏ IUUQTXXXDSZQUSFDHPKQ ˔
ιϧτͱ͍͏ϥϯμϜͳจࣈྻΛՃͯ͠ϋογϡԽ ˓ طʹจࣈྻ㲗ϋογϡͷ͕͔͍ؔͬͯΔ߹ʹରͯ͠ ༗ޮʢ߈ܸଆʹιϧτͷ༰͕࿙Εͳ͍ݶΓʣ ˓ ७ਮʹύεϫʔυ͕͘ͳΔͷͰղಡʹ͕͔͔࣌ؒΔ
ετϨονϯά 13 ˔ ϋογϡͱιϧτ͚ͩͰ·͍ͩ ˓ ۙڧྗͳܭࢉࢿݯΛ׆༻ͨ͠ߴͳ૯ͨΓ͕ߦΘΕΔ ˓ ΑΓղಡʹ͕͔͔࣌ؒΔΑ͏ʹ͢Δ ˔ ϋογϡԽͷॲཧΛઍʙສճ܁Γฦ͢
˓ ετϨονϯάͷճʹରͯ͠ઢܗతʹղಡ͕࣌ؒ ͔͔ΔΑ͏ʹͳΔ ˓ ετϨονϯάͷճʢʹղಡ࣌ؒͷ૿Ճʣ ॲཧʹ͔͔Δ࣌ؒͷ͞ͱͷτϨʔυΦϑ
·ͱΊ ˔ ฏจύεϫʔυμϝ ˔ ύεϫʔυ࠷ݶιϧτ͖ϋογϡԽΛߦ͍ɼߋʹ ετϨονϯάͯ͠ڧΛ্͛Δ ˓ ࠓ͜ΕͰྑ͍ͱ͞Ε͍ͯΔ͕ɼະདྷͰ ͞ΒʹڧΛ্͛Δ͜ͱ͕ٻΊΒΕ͍ͯΔ͔ ˔
ࣗͷ͏ύεϫʔυͰ͖Δ͚ͩ͘͢Δ ˓ ෳࡶ͞ʢ͏จࣈछͷଟ͞ʣΑΓ͕͞ॏཁ 14
͓·͚ ˔ %KBOHPύεϫʔυΛͲ͏ͬͯอଘ͍ͯ͠Δͷ͔CZ 3ZVKJ5TVUTVJ IUUQTMJOLNFEJVNDPN01[W,:2Q7 ˔ ʰମܥతʹֶͿ҆શͳ8FCΞϓϦέʔγϣϯͷ࡞Γํ ୈ൛੬ऑੑ͕ੜ·ΕΔݪཧͱରࡦͷ࣮ફʱ IUUQTXXXBNB[PODPKQEQ SFGDN@TX@FN@S@NU@EQ@6@F/$C$(485
15