19.11 密码的弱点（ Password Vulnerabilities） 若密码写在可以被读取或遗失的地方， 则暴露是非常严重的问题。 有些系统强迫使用者选择不易记忆或较长的密码。
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用户名和密码的组合带来了一个弱点。
The user name and password combo provide a point of weakness.
脆弱点出现的范围很广，从明显的——像使用不健壮的密码或存储无保护的私有数据——到更有细微差异的——像未检查的输入。
Vulnerabilities occur across a wide spectrum, from the obvious — like using a weak password or storing unprotected private data — to the more nuanced — like unchecked input.
辫子群是一种新兴的适用于量子计算机时代的公钥密码平台，但是目前基于辫子群的密钥协商协议AAG、AAFG和BDH等都有不同程度的安全弱点。
It seems that braid group is a kind of considerable public key cryptography platform, but current key agreement protocols, such as AAG, AAFG and BDH, all have different degrees of security weaknesses.
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