为什么银行秘密要用六位数呢

尝试密码的时间足够长,保密等级的需要。
例如军事保密通信，分战术级别，就保密一场小战斗器件不被破译；战略级别，几个月期间，用一般的计算机无法破译就可以了。
以下都验证过。
The next generation keyboard, future keyboard!
It challenged and subverted the global computer keyboard, keyboard music instruments 25 years ago，
The pioneer of the Chinese people (firstly) originally entered this area. who sent it into the modern house of the CEO of Microsoft?
To challenge AT&T of the United States by improving communication deficiencies
Improving communication deficiencies, Chinese people are to challenge AT&T of the United States.

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