[单选题]数字签名要预先使用单向Hash函数进行处理的原因是( )。

A、多一道加密工序使密文更难破译
B、保证密文能正确地还原成明文
C、缩小签名密文的长度,加快数字签名和验证签名的运算速度
D、提高密文的计算速度

参考答案： C

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