The second differential defines a weak key class which contains one out of 28 keys, for these weak keys, the probability of the second differential is increased to 2-28(= 2-36·28).
第二个差分特征用到了一组弱密钥，其个数占总密钥个数的2-8，对这些弱密钥，第二个差分特征成立的概率增加到2-28(=2-36·28)。
参考来源 - 对杂凑函数和分组密码算法的分析·2,447,543篇论文数据，部分数据来源于NoteExpress
以上来源于: WordNet
The byte array after this weak key processing is a temporary secret key.
经过这种弱密钥处理的字节数组是一个临时密钥。
If the parity fixing does not result in a weak key, you don't need this exclusive OR operation.
如果奇偶修正得到的不是弱密钥，那么就不需要进行这种exclusive OR操作。
However, its weak key encryption caused some hacker software easily to get the database password.
但是由于数据库的加密机制非常简单，很容易破解数据库密码，安全性差。
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