What do you mean by library collision attack? 12306 data leakage or library collision attack.

Collision with library is a professional term, but it is simple to understand in practice. In fact, it is a boring "prank" of hackers. Hackers will first collect the leaked user+password information on the Internet, generate the corresponding dictionary table, and then use the users and passwords listed in the dictionary to try to log in to other websites in batches. In this way, once the user sets the same user name and password on multiple websites in order to save trouble, the hacker will easily log in to these websites through the information already existing in the dictionary, thus obtaining the relevant information of the user, such as mobile phone number, ID number, home address, Alipay, online banking information and so on. After the information is leaked, it will not only bring huge mental and economic losses to users, but also bring negative effects to related websites.

For example, the recent smear campaign in JD.COM was actually that hackers "happened" to get some data (user names and passwords) of JD.COM users by "crashing into the library", and then left many bad reviews for JD.COM by imitating users' comments.