这个input里头老长一串是什么东西？

如下：

QUOTE:

<input type="hidden" name="__VIEWSTATE" id="__VIEWSTATE" value="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" />

如果是加密了的，它本来面貌是什么呢？ 为什么要对这个value的值加密？无忧脚本,C ^{2Z:WPvi

-C3`x't6`X0 请高手帮忙解疑！