KEYWORDS
    breach          破壞，缺口，違背
　　attack          攻擊
    vulnerability   脆弱性 
　　interception    截獲，竊聽
    penetration     滲入，穿透
　　threat          威脅
    exposure        暴露
　　fabrication     偽造，建造

EXERCISES
Multiple choices．
（1）A computer system is a collection of＿＿＿．
     a．hardware     b．software
     c．persons      d．data
（2）An intruder may use＿＿＿to penetrate a computer system．
     a．the most obvious means    b．the less obvious means
     c．any available means       d．one fixed way
（3）A sophisticated perimeter physical security system＿＿＿．
     a．can compensate for unguarded access by telephone line
     b．can not compensate for unguarded access by telephone line
     c．can compensate for unguarded access by a modem
     d．can not compensate for unguarded access by a modem
（4）The weakest point is＿＿＿．
     a．the easiest penetration    b．the most serious vulnerability
     c．expected by any intruder   d．difficult to break
（5）The major assets of computing systems are＿＿＿．
     a．hardware     b．software
     c．data         d．all of them
（6）Interruption can cause asset of system＿＿＿．
     a．useful          b．unusable
     c．unavailable     d．lost
（7）Unauthorized party can be＿＿＿．
     a．a computer system      b．a person
     c．legal user             d．a program
（8）Examples of modification include＿＿＿．
     a．modification of the values in a data base
　　 b．altering a program
     c．modifying data being transmitted
　　 d．making the operating system unavailable
（9）Fabrication intrusion includes＿＿＿．
     a．to add spurious transaction   b．to interrupt a system
     c．to fabricate objects          d．to add records
（10）There are＿＿＿kinds of threats to the security of a computer system．
      a．three    b．four
      c．five     d．six

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