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test

test github test............ ###test1

$P_i = D_k(Ci)\oplus C{i-1}$

$C_0 = IV$

令A为第N-1块的密文,B为第N块经过key解密后(不是明文),C为第N块明文

则有$C = A \oplus B \implies C \oplus A \oplus B = 0 \implies C \oplus A \oplus B \oplus X = X$

并且密文A是可控的,所以可以令A=$A \oplus C \oplus X$ ,这样就能令C=X

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