【题目】 【翻译】对称密钥密码系统

1、[单选题]Confidentiality of the message is not enough in a secure communication; ________ is also needed. The receiver needs to be sure of the sender’s identity.

• A、encryption
• B、authorization
• C、authentication
• D、encapsulation

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2、[单选题]When you send a document electronically, you can also sign it. This is called ______ signature.

• A、online
• B、digital
• C、virtual
• D、simulated

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3、[单选题]To access a page on the WWW, one needs a _______ that usually consists of three parts: a controller, a method, and an interpreter.

• A、router
• B、code
• C、password
• D、browser

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4、[主观题]【翻译】硬盘驱动器

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5、[单选题]Data ______ can reduce the amount of data sent or stored by partially eliminating inherent redundancy.

• A、compression
• B、conversion
• C、configuration
• D、compilation

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