验证码的程序及原理


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##### 作者：扬子 
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##### QQ: 21112856
##### WebSite: www.tingfo.net

一共4个页面：form.asp; chk.asp; num.asp; count.asp
得到一个随即数字。加密！
解密后成成XBM图片
利用session 判断
form.asp

<%
### 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
### 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
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 ###
### 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)
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
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>

chk.asp
<%
if trim(request.form("pwds"))<>trim(session("pwdt")) then
%>
输入错误： 应该为：<%=session("pwdt")%>，可你输入的是:<%=request.form("pwds")%>
<%
else
%>
输入正确
<%end if%>
count.asp
<!--#include file="num.asp"-->
<%
### 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
### 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
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 ###
### 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)
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
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
ElseI

补充：综合编程 , 安全编程 ,