代码加密的,怎么解码?

Question

有个网页是ASPX格式,内嵌JavaScript,但有段代码已经加密，请问如何能够解密查看原代码？代码如下：<form name="Logon" method="post" action="index_LOGIN.aspx" id="Logon" onsubmit="return ChkValue();">
 <input type="hidden" name="__VIEWSTATE" value="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" />

Answer 1

value 是他的值吗？那是ViewState！

Answer 2

不需要解码,因为根本没有加密,,只是用base64编码了一下而已.Response.Write(System.Text.Encoding.UTF8.GetString(Convert.FromBase64String(Request["="__VIEWSTATE"])))
就可以了

Answer 3

晕,符号打错了,更正
Response.Write(System.Text.Encoding.UTF8.GetString(Convert.FromBase64String(Request["__VIEWSTATE"])))

Answer 4

有专门的VIEWSTATE解码软件，可以去找找