单选题:下列关于信息加密的叙述中,正确的是(  )。

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题目内容:
下列关于信息加密的叙述中,正确的是(  )。 A.加密通过加密算法实现
B.加密前的文件称为密文
C.加密后的文件称为明文
D.将明文变为密文的过程称为解密

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