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暗号学的ハッシュ関数 / cryptographic hash function
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Kenji Saito
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June 01, 2023
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」2023 夏クォーターのオンデマンド教材 第7回で使用したスライドです。
Kenji Saito
PRO
June 01, 2023
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Transcript
Financial technology in the living room. Generated by Stable Diffusion
XL Beta — 2023 7 (WBS) — 2023 7 — 2023-06 – p.1/12
https://speakerdeck.com/ks91 — 2023 7 — 2023-06 – p.2/12
( 20 ) 1 • 2 • 3 • 4
(TCP/IP ) • 5 • 6 • 7 • 8 9 10 World Wide Web 11 Web API 12 13 git GitHub 14 (6/19 ) / (2 ) OK / — 2023 7 — 2023-06 – p.3/12
LAZE SOFTWARE https://lazesoftware.com/ja/tool/hash/ SHA (Secure Hash Algorithm) SHA (NIST) (
) — 2023 7 — 2023-06 – p.4/12
( ) ( ) ↔ ← ← — 2023 7
— 2023-06 – p.5/12
( ) ( ) ( 16 ) SHA Secure Hash
Algorithm ( ) 1 : — 2023 7 — 2023-06 – p.6/12
SHA-1 https://shattered.it SHA-1 160 2017 2 Google (CWI) — 2023
7 — 2023-06 – p.7/12
H (pre-image resistance) h h = H(m) m 2 (
) (second pre-image resistance) m1 H(m1 ) = H(m2 ) m2 ( m1 = m2 ) ( ) 256 8 . . . — 2023 7 — 2023-06 – p.8/12
160 256 . . . . . . 8.8 ×
1023 km 1023+6 mm 160 1,000 103 16 1016×3 1029 mm 160 1048 1 — 2023 7 — 2023-06 – p.9/12
— 2023 7 — 2023-06 – p.10/12
50% 253 50% 23 OK n 2n 2 160 80
SHA-1 (160 ) — 2023 7 — 2023-06 – p.11/12
— 2023 7 — 2023-06 – p.12/12