[請益] 數學式寫成程式碼

看板Programming作者freeman0220 (wiki)時間12年前 (2011/12/25 17:58)推噓1(1推 0噓 8→)

留言9則, 5人參與討論串1/2 (看更多)

最近要學一點程式，要用提供的數學式寫成程式碼有點不知道要怎麼寫也不知道要去哪個版發問所以在這裡詢問，請見諒 Let p = 7, q = 11, then n = 77. For simplicity, let l = 2, that is, each plaintext message is split into 2 smaller pieces. Let ri = si = 5, i = 1, 2. Suppose there are two plaintext numbers in Z77: a = 10 and b = 7. It can easily be seen that 7a+b ≡ 0 (mod 77) and 14a + 2b ≡ 0 (mod 77). The scheme runs as follows. Encrypting a: Decompose a into a1 = 4 and a2 = 6. E(a) = ((4 × 5 mod 7, 4 × 5 mod 11), (6 × 5 mod 7, 6 × 5 mod 11)) = ((6, 9), (2, 8)) Encrypting b: Decompose b into b1 = 3 and b2 = 4. E(b) = ((3 × 5 mod 7, 3 × 5 mod 11), (4 × 5 mod 7, 4 × 5 mod 11)) = ((8, 4), (6, 9)) Computing E(7a + b): E(7a + b) = ((7 × 6 + 8, 7 × 9 + 4), (7 × 2 + 6, 7 × 8 + 9)) mod 77 = ((50, 67), (20, 65)) 寫成C 或 javascript都可以 -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 175.180.67.19

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