財務(wù)管理第4章 信息理論《密碼學(xué)：加密演算法》(鄧安文)(免費)
Sp:2 S2M|MSp(A)0ASp(S)1p(AB)p(A)p(B)ABp()0 ABp(A)p(B)0p(A)1ASp(S A)1p(A)12nAAA、nniii 1i 1p(A)p(A)a Ap(A)p(a)p(a)p(a)p(B)0p(AB)p(A|B)p(B)p(AB)p(A)p(B)p(A|B)p(A)p(A)0p(B)0p(B)p(A|B)p(A)p(B|A)p(A|B)p(B)p(AB)p(B|A)p(A)p(AB)p(B)p(A|B)p(A)p(B|A)p(m|c)p(m)#CKp(m)0kE(m)c2x AH(X)p(Xx)log(p(Xx)X Y2X Y(x,y)A BH(X,Y)p(x,y)log(p(x,y)Xx AXY2Yx Ay BX Y2Y(x,y)A BH(Y|X)p(x)H(Y|Xx)p(x)p(y|x)log p(y|x)p(x,y)log p(y|x)。H(X,Y)H(X)H(Y|X)X Y2X Y(x,y)A BH(X,Y)p(x,y)log p(x,y)X Y2XY(x,y)A Bp(x,y)log p(x)p(y|x)X Y2X(x,y)A Bp(x,y)log p(x)X Y2Y(x,y)A Bp(x,y)log p(y|x)2XX Yx Ay Blog p(x)p(x,y)H(Y|X)X2Xx Ap(x)log p(x)H(Y|X)X YXy Bp(x,y)p(x)H(X)H(Y|X)H(X)log2|A|H(X,Y)H(X)H(Y)H(Y|X)H(Y)H(M|C)H(M)H(K|C)H(K)H(M)H(C)H(K,M,C)=H(M,K)+H(C|M,K)H(M,K)(H(C|M,K)=0)H(K)H(M)H(K,M,C)=H(K,C)+H(M|K,C)H(K,C)(H(M|K,C)=0)H(C)H(K|C)H(K|C)H(K,C)H(C)H(K)H(M)H(C)ncCk(c):k|E(m)KnLnH()HlimnM ML2HR1log|M MUnicity距離n0估計為：202log|nRlog|K KM M202log 26n1.330.75log 26202log 312n2.350.75log 26n202log 2n1.33nn0.75log 2
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