[請益] 同代像演算法加密
這裡有一些數學式 是有關於同代像加密法的
我的數學能力和程式能力並不是很強...
所以我不知道該怎麼讓他從數學式轉成程式碼
他不算是作業，只是老師要我們想看看
我還是不清楚要怎麼寫...
請版內高手幫我解答一下...
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))
用C或javascript 都可以
謝謝。
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