以下是引用片段：
<%
"### To encrypt/decrypt include this code in your page
"### strMyEncryptedString = EncryptString(strString)
"### strMyDecryptedString = DeCryptString(strMyEncryptedString)
"### You are free to use this code as long as credits remain in place 数据挖掘论坛
"### also if you improve this code let me know.
Private Function EncryptString(strString)
"####################################################################
"### Crypt Function (C) 2001 by Slavic Kozyuk grindkore@yahoo.com ###
"### Arguments: strString <--- String you wish to encrypt ###
"### Output: Encrypted HEX string ###
"####################################################################
Dim CharHexSet, intStringLen, strTemp, strRAW, i, intKey, intOffSet
Randomize Timer
intKey = Round((RND * 1000000) + 1000000) "##### Key Bitsize
intOffSet = Round((RND * 1000000) + 1000000) "##### KeyOffSet Bitsize 数据挖掘研究院
If IsNull(strString) = False Then
strRAW = strString
intStringLen = Len(strRAW)
For i = 0 to intStringLen - 1
strTemp = Left(strRAW, 1)
strRAW = Right(strRAW, Len(strRAW) - 1)
CharHexSet = CharHexSet & Hex(Asc(strTemp) * intKey)& Hex(intKey)
Next
EncryptString = CharHexSet & "|" & Hex(intOffSet + intKey) & "|" & Hex(intOffSet)
Else
EncryptString = ""
End If
End Function
Private Function DeCryptString(strCryptString)
"####################################################################
"### Crypt Function (C) 2001 by Slavic Kozyuk grindkore@yahoo.com ### 数据挖掘论坛
"### Arguments: Encrypted HEX stringt ###
"### Output: Decrypted ASCII string ###
"####################################################################
"### Note this function uses HexConv() and get_hxno() functions ###
"### so make sure they are not removed ###
"####################################################################
Dim strRAW, arHexCharSet, i, intKey, intOffSet, strRawKey, strHexCrypData
strRawKey = Right(strCryptString, Len(strCryptString) - InStr(strCryptString, "|"))
intOffSet = Right(strRawKey, Len(strRawKey) - InStr(strRawKey,"|"))
intKey = HexConv(Left(strRawKey, InStr(strRawKey, "|") - 1)) - HexConv(intOffSet) 数据挖掘研究院
strHexCrypData = Left(strCryptString, Len(strCryptString) - (Len(strRawKey) + 1))
arHexCharSet = Split(strHexCrypData, Hex(intKey))
For i=0 to UBound(arHexCharSet)
strRAW = strRAW & Chr(HexConv(arHexCharSet(i))/intKey)
Next
DeCryptString = strRAW
End Function
Private Function HexConv(hexVar)
Dim hxx, hxx_var, multiply
IF hexVar <> "" THEN
hexVar = UCASE(hexVar)
hexVar = StrReverse(hexVar)
DIM hx()
REDIM hx(LEN(hexVar))
hxx = 0
hxx_var = 0
FOR hxx = 1 TO LEN(hexVar)
IF multiply = "" THEN multiply = 1
hx(hxx) = mid(hexVar,hxx,1)
hxx_var = (get_hxno(hx(hxx)) * multiply) + hxx_var 数据挖掘实验室
multiply = (multiply * 16)
NEXT
hexVar = hxx_var
HexConv = hexVar
END IF
End Function
Private Function get_hxno(ghx)
If ghx = "A" Then
ghx = 10
ElseIf ghx = "B" Then
ghx = 11
ElseIf ghx = "C" Then
ghx = 12
ElseIf ghx = "D" Then
ghx = 13
ElseIf ghx = "E" Then
ghx = 14
ElseIf ghx = "F" Then
ghx = 15
End If
get_hxno = ghx
End Function
%>
<%
randomize
num = int(7999*rnd+2000) "计数器的值
num2 = EncryptString(num)
session("pwdt")=num
%>
<form action="chk.asp" method=post>
请输入验证码： <input type="text" name="pwds">
<img src="count.asp?sksid=<%=num2%>"> <input type=submit value=提交>
</form> |
