【题目】 People who gain unauthorized access to a computer system for malicious purposes are called _______.

1、[单选题]A ______ copy is a copy of a current file made in order to protect against loss or damage.

• A、hard
• B、backup
• C、soft
• D、file

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2、[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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3、[单选题]Whereas the decimal system is based on 10, the ________ system is based on 2. There are only two digits in the latter system, 0 and 1.

• A、bilateral
• B、binary
• C、byte
• D、bit

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4、[单选题]The infamous “Michelangelo” ____ strikes thousands of computers every year on March 6.

• A、cracker
• B、hacker
• C、virus
• D、disease

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5、[单选题]The data, when they are not encrypted, are called ________.

• A、plaintext
• B、ciphertext
• C、hypertext
• D、context

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