安全密码设置

目的：
1. 设计复杂密码
2. 并且不同网站不同密码

方案：
1. 采用 base + suffix 机制
2. base 对所有密码统一，可以很复杂
3. suffix 简单一些，但是要求不能和网站相联系，但是为了好记可以和网站有复杂隐秘联系

base 设计，微软的建议

What to do	Suggestion	Example
Start with a sentence or two (about 10 words total).	Think of something meaningful to you.	Long and complex passwords are safest. I keep mine secret. (10 words)
Turn your sentences into a row of letters.	Use the first letter of each word.	lacpasikms (10 characters)
Add complexity.	Make only the letters in the first half of the alphabet uppercase.	lACpAsIKMs (10 characters)
Add length with numbers.	Put two numbers that are meaningful to you between the two sentences.	lACpAs56IKMs (12 characters)
Add length with punctuation.	Put a punctuation mark at the beginning.	?lACpAs56IKMs (13 characters)
Add length with symbols.	Put a symbol at the end.	?lACpAs56IKMs" (14 characters)

密码要加入标点、数字和符号字符
大小写则暂时不采用，因为有些网站不支持
空格是否支持？

suffix
自己设计，保密