Please enable JavaScript.

Coggle requires JavaScript to display documents.

10/27_密碼學, finite field(galois field), 改良加密標準 - Coggle Diagram

- - - - 使用廣泛原因
        
        主輸出技術所限制
    - - General form
        
        w:word size
        
        2*w bits
        
        r:round times
        
        b:key length
        
        8*b bits
- - - - e + a = a
      - operation單位元素
    - - a + a^-1 = e
  - - - 一元素透過operation可產生全元素in group
        
        genertor
    - - add
        
        abelean group
      - multiple
        
        closure
        
        distribution
        
        distribut
- - - - (a+b) mod p
        
        if result = 0 -> +反元素(-w)
        
        (ab) mod p = 0->反元素(w^-1)
  - - - f(x) = q(x)*g(x)+r(x)
      - g(x)若不可分解因式->irreducible polynomial
    - - (a(x)*b(x)) mod f(2^n)
      - inverse
- - - - 同階級交互，異階級不交互
      - coffient本身即是GF(2^N)
        
        m
        
        M-->處理C
    - - 10:16
      - 12:24
      - 14:32