以下关于报文摘要的叙述中，正确的是（）。
- A.报文摘要对报文采用RSA进行加密
- B.报文摘要是长度可变的信息串
- C.报文到报文摘要是多对一的映射关系
- D.报文摘要可以被还原得到原来的信息
正确答案及解析
正确答案
解析
数字摘要（Digital Digest）加密方法亦称安全Hash编码法（SHA）或MD5。该编码法采用单向Hash函数将需加密的明文“摘要”成一串128bit的密文，这一串密文亦称为数字指纹（Finger Print），它有固定的长度，且不同的明文摘要必定一致。这样这串摘要使可成为验证明文是否是“真身”的“指纹”了。
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