题目内容
数字签名技术是公开密钥算法的一个典型应用，在发送端，采用______对要发送的信息进行数字签名；在接收端，采用______进行签名验证。
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可以认为数据的加密和解密是对数据进行的某种变换，加密和制者的过程都是在（）的控制下进行的。
数字签名为保证其不可更改性，双方约定使用（）。
（）是网络通信中标志通信各方身份信息的一系列数据，上发证身份的方式。
11/22/2014our class did (1) _______ a research project into human behavior. Some teachers did (2)_____a lecture on the topic "What makes a hero?" The topic has aroused great interest among students on campus. The weblog has been updated almost every minute, which involves even students from other departments, students who preferred not to do (3) _______any course in the humanities. People have made (4)______ the phrase everyday heores for those ordinary people who sacrifice themselves for others at the moment of life and death. The inspiring stories of the heroes have made (5) ______ a vivd and moving impression on all of us.
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