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勉強会 #3

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May 27, 2018
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勉強会 #3

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titech.crypto

May 27, 2018
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  1. Ұํ޲ੑ ݪ૾ܭࢉࠔ೉ੑ 0OFXBZOFTT 1SFJNBHF3FTJTUBODF • ߈ܸऀ͸ɺh (=H(m)) Λೖྗͱͯ͠༩͑ΒΕͨͱ͖ɺh = H(m’)

    Λຬͨ͢m’ Λग़ྗ͢Δ͜ͱ͕ࠔ೉Ͱ͋Δ͜ͱɻ͜ ͷ৔߹ɺm Ҏ֎ͷ஋ m’ Λग़ྗͯ͠΋ɺϋογϡ஋͕ h Ͱ͋Ε͹ɺ߈ܸʹ੒ޭͨ͜͠ͱʹͳΓ·͢ɻ
  2. িಥϖΞ͕ٻ·Δ৚݅ɾ֬཰ w QݸͷϘʔϧͱOݸͷശ͕͋ΓɺശʹϥϯμϜʹϘʔϧΛೖΕͨ࣌ʹɺি ಥ͢Δ֬཰1 Q O P(p, n) = (

    1 (p > n ͷͱ͖.) 1 n n n 1 n n 2 n · · · n p+1 n (p  n ͷͱ͖.) P(p, 365) ͷ৔߹ 8JLJQFEJB஀ੜ೔ͷύϥυοΫε 㲋O