Need Security Against Digital Signature Forgeries - … › system › files ›...
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Transcript of Need Security Against Digital Signature Forgeries - … › system › files ›...
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• 𝑀 → 0,1 128
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• 𝑖
• 𝐵𝑘′ 𝐵𝑘 𝑊𝑆𝑖′ 𝑊𝑆𝑖•
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2−128 2−160
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• 𝑁𝛿𝑀
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•𝛿
• 𝐷 𝑉 𝑠
• 𝛿𝑀 𝑠
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• (𝛿𝐵, 𝛿𝑊𝑆)
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𝛿𝐵
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• 𝛿𝐵
• 𝛿𝐵
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𝑈𝑖 𝐷𝑉𝑖𝑉𝑖 𝐷𝑉𝑖
𝑈𝑖\V𝑖
𝑉𝑖𝑈𝑖 = 𝑉𝑖 𝐷𝑉𝑖
•𝑀𝑖 𝑎 ⊕𝑀𝑗 𝑏 = 0/1
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