📄 验证码的程序及原理.htm
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strDate = strDate + "星期二"
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case 4:{
strDate = strDate + "星期四"
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<TD bgColor=#297dff colSpan=2 height=20><FONT color=#ceffff> →
<A href="http://www.aspsky.net/article/index.asp?classid=2"><FONT
color=#ceffff>ASP技术</FONT></A> >> <A
href="http://www.aspsky.net/article/index.asp?classid=2&Nclassid=2"><FONT
color=#ceffff>ASP应用</FONT></A> >> 《验证码的程序及原理》</FONT></TD></TR>
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<TD align=middle class=p4
colSpan=2><B>验证码的程序及原理</B></FONT><BR>2002-11-28 动网先锋
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<BLOCKQUOTE><BR>##### 版权所有 转载请保留 谢谢合作 <BR>##### 部分程序取自网络 <BR>#####
作者：扬子 <BR>##### Email: yangzinet@hotmail.com <BR>##### QQ:
21112856<BR>##### WebSite: www.tingfo.net
<P></P>
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<P>一共4个页面：form.asp; chk.asp; num.asp;
count.asp<BR>得到一个随即数字。加密！<BR>解密后成成XBM图片<BR>利用session 判断</P>
<P>form.asp</P>
<P><BR><%<BR>'### To encrypt/decrypt include this code in your
page <BR>'### strMyEncryptedString =
EncryptString(strString)<BR>'### strMyDecryptedString =
DeCryptString(strMyEncryptedString)<BR>'### You are free to use
this code as long as credits remain in place<BR>'### also if you
improve this code let me know.<BR><BR>Private Function
EncryptString(strString)<BR>'####################################################################<BR>'###
Crypt Function (C) 2001 by Slavic Kozyuk grindkore@yahoo.com
###<BR>'### Arguments: strString <--- String you wish to
encrypt ###<BR>'### Output: Encrypted HEX string
###<BR>'####################################################################<BR><BR>Dim
CharHexSet, intStringLen, strTemp, strRAW, i, intKey,
intOffSet<BR>Randomize Timer<BR><BR>intKey = Round((RND * 1000000)
+ 1000000) '##### Key Bitsize<BR>intOffSet = Round((RND * 1000000)
+ 1000000) '##### KeyOffSet Bitsize<BR><BR>If IsNull(strString) =
False Then<BR>strRAW = strString<BR>intStringLen =
Len(strRAW)<BR><BR>For i = 0 to intStringLen - 1<BR>strTemp =
Left(strRAW, 1)<BR>strRAW = Right(strRAW, Len(strRAW) -
1)<BR>CharHexSet = CharHexSet & Hex(Asc(strTemp) *
intKey)& Hex(intKey)<BR>Next<BR><BR>EncryptString = CharHexSet
& "|" & Hex(intOffSet + intKey) & "|" &
Hex(intOffSet)<BR>Else<BR>EncryptString = ""<BR>End If<BR>End
Function<BR><BR><BR><BR><BR>Private Function
DeCryptString(strCryptString)<BR>'####################################################################<BR>'###
Crypt Function (C) 2001 by Slavic Kozyuk grindkore@yahoo.com
###<BR>'### Arguments: Encrypted HEX stringt ###<BR>'### Output:
Decrypted ASCII string
###<BR>'####################################################################<BR>'###
Note this function uses HexConv() and get_hxno() functions
###<BR>'### so make sure they are not removed
###<BR>'####################################################################<BR><BR>Dim
strRAW, arHexCharSet, i, intKey, intOffSet, strRawKey,
strHexCrypData<BR><BR><BR>strRawKey = Right(strCryptString,
Len(strCryptString) - InStr(strCryptString, "|"))<BR>intOffSet =
Right(strRawKey, Len(strRawKey) - InStr(strRawKey,"|"))<BR>intKey
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