As long as users choose passwords that are sufficiently difficult for others to guess, the combination of a user name and password is usually enough to establish identity.
只要用户选择了他人很难猜到的密码，那么用户名和密码的组合通常就足以确立身份。
Mr. Moss relies on passwords at least 12 characters long, figuring that those make him a more difficult target than the millions of people who choose five- and six-character passwords.
Moss先生认为密码至少应该有12个字符长，数据显示，这是一个难以完成的认为，因为数以百万的用户使用的密码只有五六个字符。
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