Alumni State applet sign-in encryption logic analysis

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In the article Realizing automatic sign-in by capturing the alumni state applet , we know that sign-in and sign-out are realized by requesting the following interface

 1

 https://xcx.xybsyw.com/student/clock/Post.action

Among them, Cookie in the request header can be obtained through the interface, v and n are fixed values, and the three parameters t , s , and m are generated by code

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