那一页的数字中有几个差错。
在数字通信系统中可靠与快速往往是一对矛盾。为了解决可靠性，通信系统都采用了差错控制。
Reliability and speediness are contradictory in the digital communication systems which adopt error control in order to solve reliability .
报文信息的鉴别认证可采用差错控制码、报文鉴别码与数字签名进行。
Message information may be authenticated with error-control code, message authenticated code and digital signature.
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