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暗号学的ハッシュ関数 / Cryptographic Hash Functions
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Kenji Saito
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June 15, 2024
Technology
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59
暗号学的ハッシュ関数 / Cryptographic Hash Functions
早稲田大学大学院経営管理研究科「サイバーセキュリティ」2024 夏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
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June 15, 2024
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Transcript
Hardening for cyber security — generated by Stable Diffusion XL
v1.0 2024 7 (WBS) 2024 7 — 2024-06 – p.1/12
https://speakerdeck.com/ks91/collections/cyber-security-2024-summer 2024 7 — 2024-06 – 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 (6/24 ) / (2 ) OK / 2024 7 — 2024-06 – p.3/12
LAZE SOFTWARE https://lazesoftware.com/ja/tool/hash/ SHA (Secure Hash Algorithm) SHA (NIST) (
) 2024 7 — 2024-06 – p.4/12
( ) ( ) ↔ ← ← 2024 7 —
2024-06 – p.5/12
( ) ( ) ( 16 ) SHA Secure Hash
Algorithm ( ) 1 : 2024 7 — 2024-06 – p.6/12
SHA-1 https://shattered.it SHA-1 160 2017 2 Google (CWI) 2024 7
— 2024-06 – 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 . . . 2024 7 — 2024-06 – p.8/12
160 256 . . . . . . 8.8 ×
1023 km 1023+6 mm 160 1,000 103 16 1016×3 1029 mm 160 1048 1 2024 7 — 2024-06 – p.9/12
2024 7 — 2024-06 – p.10/12
50% 253 50% 23 OK n 2n 2 160 80
SHA-1 (160 ) 2024 7 — 2024-06 – p.11/12
2024 7 — 2024-06 – p.12/12