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写真はもう信用できない?フェイク検出から来歴証明へ
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Shuhei Shitamori
October 25, 2025
Technology
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写真はもう信用できない?フェイク検出から来歴証明へ
Shuhei Shitamori
October 25, 2025
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Transcript
Լ पฏ 2025/10/24 iPhone Dev Sapporo ࣸਅ͏৴༻Ͱ͖ͳ͍ʁ ϑΣΠΫݕग़͔Βདྷྺূ໌
ࣗݾհ Լɹपฏ • ΧφμͷσδλϧID ελʔτΞοϓ Ͱ ಇ͘iOS ΤϯδχΞ • Swift
PackageXCFramework͔ͬΓ৮ͬͯΔ • ॳΊͯࡳຈϚϥιϯʹࢀՃ 10km • ࠷ۙɺձࣾΛ࡞Γ·ͨ͠ • ࠓͷൃද΄΅iOSʹؔͳ͍Ͱ͢ ࿈བྷઌɾSNS
ͲͪΒ͕ΧϝϥͰࡱӨ͞Εͨࣸਅʁ
ͲͪΒ͕ΧϝϥͰࡱӨ͞Εͨࣸਅʁ ࠷ۙͷϑΣΠΫࣸਅύοͱݟͰஅ͢Δͷ͕͍͠ LEICA M11-PͰࡱӨͨࣸ͠ਅ https://www.tbray.org/ongoing/When/202x/2023/10/28/C2PA- Work fl ows SoraੜಈըͷεΫγϣ
ࠓ͍ͨ͜͠ͱ • ϑΣΠΫࣸਅͷྺ࢙ • ओͳϑΣΠΫࣸਅݕग़ٕज़ͷհ • ݱࣾձͰͷ՝ • ͜Ε͔Βͷղܾࡦ ʮࣸਅ͏৴༻Ͱ͖ͳ͍ʁʯ
ʹର͢Δճͷख͕͔ΓͱͳΕخ͍͠ ιʔείʔυ Ұग़·ͤΜ iOS΄ͱΜͲ ؔ͋Γ·ͤΜ
͜ͷൃදͷ͓͚Δ ”ϑΣΠΫࣸਅ” • ΧϝϥͰࡱΒΕͨͱ”ࢥΘͤΔ”Α͏ʹ࡞ΒΕ ਅ࣮ͱҟͳΔҹΛ༩͑Δը૾ • ग़ॴɺ߹ɾՃɾੜAIͳͲଟ༷ https://www.bbc.com/japanese/articles/ckrxv91x0ego
ϑΣΠΫࣸਅͷྺ࢙ (1) ҉ࣨɾϑΟϧϜͷ࣌ • ཧతͳՃʹΑΔվ͟Μ • ଟॏ࿐ग़ͰͷࡱӨ • ҉ࣨ߹ •
ߴίετͰઐՈ͚͕ͩ࡞Εͨ ϑΣΠΫͷଘࡏೝ͞Ε͍͕ͯͨ ࣸਅࣗମ৴༻͞Ε͍ͯͨ https://en.wikipedia.org/wiki/ Brown_Lady_of_Raynham_Hall ৺ྶࣸਅ(Brown Lady) https://natgeo.nikkeibp.co.jp/atcl/ gallery/052101927/index.html?P=3 ผਓͷ૾͔Β߹ͨ͠ ϦϯΧʔϯͷ૾
ϑΣΠΫࣸਅͷྺ࢙ʢ2ʣ σδλϧϑΥτ࣌ • σδλϧฤूπʔϧͷҰൠԽ • ઐՈͰͳͯ͘࡞Մೳʹ • Photoshopͷొ͕λʔχϯάϙΠϯτ →୭ͰϑΣΠΫࣸਅΛ࡞Ͱ͖Δ࣌ͷ౸དྷ https://en.wikipedia.org/wiki/Tourist_guy
911ςϩޙʹ֦ࢄ͞ΕͨϑΣΠΫࣸਅ
ϑΣΠΫࣸਅͷྺ࢙ʢ3ʣ SNS࣌ • ैདྷϝσΟΞʹΑΔݕূΛ௨ͣࣸ͞ਅͷެ։͕Մೳʹ • ҰൠਓʹΑΔߘ૿Ճ • ϓϥΠόγʔอޢͷͨΊϝλσʔλΛআ͢ΔΑ͏ʹ →ग़ॴෆ໌ͳࣸਅͷ֦ࢄεϐʔυ͕ݕূΛ্ճΔΑ͏ʹ https://en.wikipedia.org/wiki/
Hurricane_Shark ߑਫͷͨͼʹ֦ࢄ͞ΕΔ֗தαϝը૾
ϑΣΠΫࣸਅͷྺ࢙ʢ4ʣ ੜAI࣌ • ֶशʹΑΓߴ࣭ͳϑΣΠΫࣸਅΛੜՄೳʹ →ߴ࣭ͳϑΣΠΫը૾ΛੜՄೳʹ Nano BananaʹΑΔੜը૾
ϑΣΠΫࣸਅݕग़ͷݶք ϐΫηϧσʔλͷ׆༻-1 ϐΫηϧσʔλ͔ΒෆࣗવͳಛΛ୳͢ • Ճɾੜ࣌ಛ༗ͷϊΠζ • ͋Γ͑ͳ͍ཧݱɾੜཧݱ • ޫͷࣹ •
݂ • ଞͷը૾σʔλͱͷൺֱ ͜ΕΒͷΈΛֶशͨ͠ߴੑೳAIͳΒಥഁՄೳੑେ ը૾σʔλ 001011100… ϐΫηϧσʔλ ϝλσʔλ ࡱӨ࣌ใ Exif ѹॖใ ඇѹॖ Ϗοτਂ ̔bit ɾɾɾ ɾɾɾ
ϑΣΠΫࣸਅݕग़ͷݶք ϐΫηϧσʔλͷ׆༻-2 Ճɾੜ࣌ʹΥʔλʔϚʔΫΛຒΊࠐΈ • ՄࢹΥʔλʔϚʔΫ • ෆՄࢹΥʔλʔϚʔΫ • Google SynthID
ΥʔλʔϚʔΫΛຒΊࠐ·ͳ͍πʔϧ͕ΘΕΔՄೳੑ ը૾σʔλ 001011100… ϐΫηϧσʔλ ϝλσʔλ ࡱӨ࣌ใ Exif ѹॖใ ඇѹॖ Ϗοτਂ ̔bit ɾɾɾ ɾɾɾ https://deepmind.google/science/ synthid/
ϑΣΠΫࣸਅݕग़ͷݶք ϝλσʔλͷ׆༻ ExifͳͲΛνΣοΫͯ͠ ࣸਅͱͯ͠ͷ߹ੑνΣοΫ ҰํͰ • Exifࣗମվ͟Μɾੜ͞ΕΔՄೳੑ • SNSͰϝλσʔλআ͞Ε͕ͪ ը૾σʔλ
001011100… ϐΫηϧσʔλ ϝλσʔλ ࡱӨ࣌ใ Exif ѹॖใ ඇѹॖ Ϗοτਂ ̔bit ɾɾɾ ɾɾɾ
ͳͥࠓਂࠁͳͷ͔ σδλϧϑΥτ× SNS × ੜAI ࣌ ݱ • ݸਓ৫͕͋ΒΏΔతͰ •
ϑΣΠΫͩͱݟഁΕͳ͍AIࣸਅΛੜ͠ • SNS্Ͱେྔʹ֦ࢄ͞ΕΔ࣌ Ұఆͷ৴༻ͷ͋ͬͨੲͱҧ͍ʮຊʯͷࣸਅ·ͰٙΘΕΔΑ͏ʹͳͬͨ
৴༻ΛऔΓͨ͢Ίൃͷస ϑΣΠΫࣸਅΛʮݟൈ͘ʯͷͰͳ͘ຊΛʮূ໌͢Δʯ • C2PAن֨: Content Credentialsͷಋೖ • JPEG TrustʹΑΔ৴༻ࢦඪͷࠃࡍن֨Խ
ίϯςϯπฤूऀ ίϯςϯπར༻ऀ ίϯςϯπੜऀ C2PAن֨: Content Credentials • AdobeɾBBCɾSONYͳͲ͕ࡦఆ͢Δۀքඪ४ن֨ • ʮͲ͜Ͱɺ୭͕ɺͲͷΑ͏ʹ࡞ɾฤू͔ͨ͠ʯ
ͱ͍͏དྷྺใΛσδλϧॺ໊͖Ͱอଘ Χϝϥ ੜAI Adobe Photoshop Google Photo Youtube ը૾σʔλ ը૾σʔλ ը૾σʔλ ੜདྷྺใ ΛຒΊࠐΈ ฤूདྷྺใ ΛຒΊࠐΈ ฤूདྷྺใ Λ֬ೝ BBC News https://c2pa.org/
C2PA: Content Credentials ίϯςϯπσʔλʹॺ໊ࡁΈདྷྺϨίʔυσʔλຒΊࠐΈ • ੜऀใ͔ΒɺΧϝϥͰࡱӨ͞Ε͔ͨΘ͔Δ • ฤूऀใ͔ΒɺͲͷΑ͏ʹՃ͞Ε͔ͨΘ͔Δ • σʔλΛվ͟Μ͞Εͯॺ໊σʔλʹΑΓݕՄೳ
• ۀքඪ४ن֨ͳͷͰΤίγεςϜΛ࡞ΕΔ ը૾σʔλ 001011100… ϐΫηϧσʔλ ϝλσʔλ ࡱӨ࣌ใ Exif ѹॖใ ඇѹॖ Ϗοτਂ ̔bit ɾɾɾ ɾɾɾ དྷྺϨίʔυσʔλ ॺ໊͖ੜऀใ ॺ໊͖ฤूऀใ ॺ໊͖ฤूऀใ ɾɾɾ
σϞ • https://verify.contentauthenticity.org/ͰདྷྺσʔλΛνΣοΫͯ͠ΈΔ
JPEG Trust • JPEG͕ओಋ͢Δࠃࡍඪ४ن֨(ISO/IEC 21617) • 20251݄ʹن֨Խ • ڈࡳຈͰن֨Խʹ͚ͨձ͕ٞ͋ͬͨΒ͍͠ •
C2PAͷΑ͏ͳདྷྺใΛؚΊɺ ը૾ͷ৴༻ΛԽ ը૾ͷ৴༻ΛఆྔධՁͰ͖ΔΑ͏ʹͳΔ https://jpeg.org/jpegtrust/
ΤίγεςϜͷݱঢ় C2PAରԠൃల్্, JPEG Trustܾ·ͬͯͳ͍͜ͱଟ͍ • ੜऀ • Χϝϥ: Leica, Nikon,
Sony, Google PixelͷҰ෦ػछ • ੜAI: OpenAIͷDALLE • ฤू༰ͷՃ • Adobe Photoshop • ར༻ऀ • YouTube, Google Photo, BBC ੜऀ͔Βར༻ऀ·ͰC2PAରԠ͠ͳ͍ͱ͍͚ͳ͍ͷͰɺԸܙΛड͚ΒΕΔͷ͏গ͠ઌʹͳΓͦ͏
iOSΤϯδχΞͱͯ͠Ͱ͖Δ͜ͱ • ։ൃΞϓϦͰC2PAΤίγεςϜͷߩݙ • ը૾ฤूΞϓϦ → ը૾ʹདྷྺϨίʔυΛՃ • ը૾৴ΞϓϦ →
དྷྺϨίʔυΛআ͠ͳ͍ • χϡʔεΞϓϦ → JPEG TrustݕূʹΑΓ৴པνΣοΫ • SNSΞϓϦ → JPEG TrustݕূʹΑΓ৴པΛՄࢹԽ • iPhoneΧϝϥ͕C2PAରԠ͞ΕΔΑ͏ʹAppleѹྗ iOS͚SDK https://github.com/contentauth/c2pa-ios
͞ΒͳΔ৴༻ʹ͚ͯ • ΧϝϥࡱӨͷূ໌͕͞Εͨࣸਅ͕ʮਅ࣮ʯͱݶΒͳ͍ • ͞ΒͳΔٕज़ൃలɺϦςϥγʔڭҭ݁ہେࣄ DALL·E ੜը૾ ϑΣΠΫࣸਅΛΧϝϥͰࡱӨ https://fuushiga.com/its- media/
ϝσΟΞͷ෩
·ͱΊ • ݱࣸਅʹର͢Δ৴༻͕༳Β͍Ͱ͍Δ • C2PAͱJPEG TrustʹΑΓϑΣΠΫͷݕग़͔Β དྷྺʹΑΓʮຊʯূ໌ͷ࣌ • ΞϓϦΤϯδχΞΤίγεςϜ֦େߩݙ͢Δνϟϯε •
ͱ͍͑ɺ·ͩ·ͩ৴༻֫ಘʹ͚ͯվળͷ༨͋Γ ʮࣸਅ͏৴༻Ͱ͖ͳ͍ʁʯʹରͯ͠ɺղ૾͕ߴ͘ͳͬͨΒ͍Ͱ͢