[一个信息安全的试题请大家帮忙谢谢]采用非对称加密和数字签名传输数据. 先数字签名 保证信息传送的真实性、完整性和不可否认性 再加密 (1)Alice生成一个自己的私有密钥并用Bob的公开密钥对自己的私有密钥进行...+阅读

请帮忙做个英语考试题

How Do Students Spend Their Summer VacationIn the past,student spent their summer vacation in happiness,they enjoyed their time with their good friends,they played many games,such as swimming,dancing and so on.they had little summer homework to do ,and teachers and parent and relatives were not serious with their study,so students were happy at that time.But now all had changed,students have too much summer homework to complete,they have extra lessons at summere time ,and also they take extra course that not very interesting,in another word,they are still busy with their lessons in there summer vacation!teachers and parents also press them more,!From my point of view,I appeal to that teachers and parents should leave little homework to us,give us more space time and let's do the things we like to!we don't like to always have lessons,we should be free!...

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