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  3. Passwords are everywhere in computer security. All too often, they are also ineffective. A good password has to be both easy to

Passwords are everywhere in computer security. All too often, they are also ineffective. A good password has to be both easy to

admin2018-05-18  52
问题    Passwords are everywhere in computer security. All too often, they are also ineffective. A good password has to be both easy to remember and hard to guess, but in practice people seem to pay attention to the former. Names of wives, husbands and children are popular. "123456" or "12345" are also common choices.
   That predictability lets security researchers(and hackers)create dictionaries which list common passwords, useful to those seeking to break in. But although researchers know that passwords are insecure, working out just how insecure has been difficult. Many studies have only small samples to work on.
   However, with the co-operation of Yahoo! , Joseph Bonneau of Cambridge University obtained the biggest sample to date—70 million passwords that came with useful data about their owners.
   Mr Bonneau found some interesting variations. Older users had better passwords than young ones. People whose preferred language was Korean or German chose the most secure passwords: those who spoke Indonesian the least. Passwords designed to hide sensitive information such as credit-card numbers were only slightly more secure than those protecting less important things, like access to games. "Nag screens" that told users they had chosen a weak password made virtually no difference. And users whose accounts had been hacked in the past did not make more secure choices than those who had never been hacked.
   But it is the broader analysis of the sample that is of most interest to security researchers. Despite their differences, the 70 million users were still predictable enough that a generic password dictionary was effective against both the entire sample and any slice of it. Mr Bonneau is blunt: " An attacker who can manage ten guesses per account will compromise around 1% of accounts. " And that is a worthwhile outcome for a hacker.
   One obvious solution would be for sites to limit the number of guesses that can be made before access is blocked. Yet whereas the biggest sites, such as Google and Microsoft, do take such measures , many do not. The reasons of their not doing so are various. So it’ s time for users to consider the alternatives to traditional passwords.
The underlined word"compromise" in Para. 5 most probably means_________.
选项 A、comprise
B、compensate
C、endanger
D、encounter
答案C
解析 语义题。由第五段第三句中“An attacker who can manage ten guesses per account will compromise around 1％ of accounts．”可知，攻击者对一个账户进行10次密码尝试输入就会对约1％的账户造成危害。结合该段最后一句“And that is a worthwhile outcome for a hacker．”可知，“这1％账户对黑客来说，已经是一个很值得的结果了。”这说明他们会根据对密码的猜测来破解账户，因此对账号造成威胁。A选项comprise“包括，构成”；B选项compensate“补偿，赔偿”；C选项endanger“濒临灭绝的”，可引申为“遭受威胁的”；D选项encounter“遭遇，偶然碰见”。对比四个选项，只有C选项endanger最符合题意，故C为正确答案。
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