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暗号学的ハッシュ関数 / Cryptographic Hash Function

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Avatar for Kenji Saito Kenji Saito PRO
June 14, 2025
Technology
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暗号学的ハッシュ関数 / Cryptographic Hash Function

早稲田大学大学院経営管理研究科「フィンテック ─ 金融革新とインターネット」2025 夏のオンデマンド教材 第7回で使用したスライドです。

Avatar for Kenji Saito

Kenji Saito PRO

June 14, 2025

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Transcript

  1. Generated by Stable Diffusion 3.5 — 2025 7 (WBS) —

    2025 7 — 2025-06 – p.1/12

  2. https://speakerdeck.com/ks91/collections/fintech-2025-summer — 2025 7 — 2025-06 – p.2/12

  3. ( 20 ) 1 ↑ • 2 ↓ 2025 •

    3 • 4 (TCP/IP ) • 5 • 6 • 7 • 8 ↑ 9 ↓ 2024 ( ) 10 World Wide Web 11 Web API 12 * 13 git GitHub 14 (6/23 ) / (2 ) OK / — 2025 7 — 2025-06 – p.3/12

  4. LAZE SOFTWARE https://lazesoftware.com/ja/tool/hash/ SHA (Secure Hash Algorithm) SHA (NIST) (

    ) — 2025 7 — 2025-06 – p.4/12

  5. ( ) ( ) ↔ ← ← — 2025 7

    — 2025-06 – p.5/12

  6. ( ) ( ) ( 16 ) SHA Secure Hash

    Algorithm ( ) 1 : — 2025 7 — 2025-06 – p.6/12

  7. SHA-1 https://shattered.it SHA-1 160 2017 2 Google (CWI) — 2025

    7 — 2025-06 – p.7/12

  8. H (pre-image resistance) h h = H(m) m 2 (

    ) (second pre-image resistance) m1 H(m1 ) = H(m2 ) m2 ( m1 = m2 ) ( ) 256 8 . . . — 2025 7 — 2025-06 – p.8/12

  9. 160 256 . . . . . . 8.8 ×

    1023 km 1023+6 mm 160 1,000 103 16 1016×3 1029 mm 160 1048 1 — 2025 7 — 2025-06 – p.9/12

  10. — 2025 7 — 2025-06 – p.10/12

  11. 50% 253 50% 23 OK n 2n 2 160 80

    SHA-1 (160 ) — 2025 7 — 2025-06 – p.11/12

  12. — 2025 7 — 2025-06 – p.12/12