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本页主题: [求助] 关于论坛的验证码机制打印 \| 加为IE收藏 \| 复制链接 \| 收藏主题 \| 上一主题 \| 下一主题

大熊的虫

级别: 仗义侠客

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[求助] 关于论坛的验证码机制

系统提示：这是一个从旧版社区导入的帖子。
如果显示不正常，或需要查找旧帖中上传的附件，请参照原帖。
原帖地址：http://my.iecn.net/bbs/view/20275.html
如非必要，请不要修改此帖！如果修改，请保留以上信息。

我自己有个留言本，本来是为大家服务提供有用信息的，可惜知名度一高，广告也多得受不了，害得我每天都要进行辛苦的维护，请教高人：怎么样解决这些问题，有人说给我那简单的留言本加下验证码机制就ＯＫ，可是具体怎么做呢？
谁有源代码吗？请仔细讲解，让我们真的受益非．．．

顶端 Posted: 2005-07-30 14:58 | [楼主]

yukkifan

加亚的自由

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生成验证码的同时，将验证码中的字符写入session然后将用户输入的值同session对比，如果相同就正确，否则就失败。

如果想具体讨论源代码，请注明你使用的语言或是在相应的版块中做详细讨论。

系统提示：这是一个从旧版导入的帖子，如有问题请参照原帖（原帖地址见顶楼）。

顶端 Posted: 2005-08-01 11:39 | 1 楼

eastjazz

德仔工作室老大

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代码：

验证码的程序及原理
##### 版权所有 转载请保留 谢谢合作 
##### 部分程序取自网络        
##### 作者：扬子           
##### Email: <a href="mailto:yangzinet@hotmail.com">yangzinet@hotmail.com</a> 
##### QQ: 21112856
##### WebSite: [url]www.tingfo.net[/url]

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 <a href="mailto:grindkore@yahoo.com">grindkore@yahoo.com</a> ###   '### 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 <a href="mailto:grindkore@yahoo.com">grindkore@yahoo.com</a> ###   '### 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
<%   '### 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 <a href="mailto:grindkore@yahoo.com">grindkore@yahoo.com</a> ###   '### 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 <a href="mailto:grindkore@yahoo.com">grindkore@yahoo.com</a> ###   '### 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        %>
<%
Dim Image
Dim Width, Height
Dim num
Dim digtal
Dim Length
Dim sort
Length = 4 '自定计数器长度
Redim sort( Length )
num=cint(DeCryptString(request.querystring("sksid")))
digital = ""For I = 1 To Length -Len( num ) '补0  digital = digital & "0"Next
For I = 1 To Len( num )  digital = digital & Mid( num, I, 1 )
Next
For I = 1 To Len( digital )  sort(I) = Mid( digital, I, 1 )
Next
Width = 8 * Len( digital )  '图像的宽度
Height = 10 '图像的高度，在本例中为固定值

Response.ContentType="image/x-xbitmap"hc=chr(13) & chr(10) 
Image = "#define counter_width " & Width & hc
Image = Image & "#define counter_height " & Height & hc
Image = Image & "static unsigned char counter_bits[]={" & hc
For I = 1 To Height  For J = 1 To Length    Image = Image & a(sort(J),I) & ","  Next
Next
Image = Left( Image, Len( Image ) - 1 ) '去掉最后一个逗号
Image = Image & "};" & hc
%><%
Response.Write Image
%>num.asp
<%
Dim a(10,10)
a(0,1) = "0x3c" '数字0
a(0,2) = "0x66"a(0,3) = "0xc3"a(0,4) = "0xc3"a(0,5) = "0xc3"a(0,6) = "0xc3"a(0,7) = "0xc3"a(0,8) = "0xc3"a(0,9) = "0x66"a(0,10)= "0x3c"a(1,1) = "0x18"  '数字1
a(1,2) = "0x1c"a(1,3) = "0x18"a(1,4) = "0x18"a(1,5) = "0x18"a(1,6) = "0x18"a(1,7) = "0x18"a(1,8) = "0x18"a(1,9) = "0x18"a(0,10)= "0x7e"
a(2,1) = "0x3c" '数字2
a(2,2) = "0x66"a(2,3) = "0x60"a(2,4) = "0x60"a(2,5) = "0x30"a(2,6) = "0x18"a(2,7) = "0x0c"a(2,8) = "0x06"a(2,9) = "0x06"a(2,10)= "0x7e"a(3,1) = "0x3c" '数字3
a(3,2) = "0x66"a(3,3) = "0xc0"a(3,4) = "0x60"a(3,5) = "0x1c"a(3,6) = "0x60"a(3,7) = "0xc0"a(3,8) = "0xc0"a(3,9) = "0x66"a(3,10)= "0x38"a(4,1) = "0x38" '数字4
a(4,2) = "0x3c"a(4,3) = "0x36"a(4,4) = "0x33"a(4,5) = "0x33"a(4,6) = "0x33"a(4,7) = "0xff"a(4,8) = "0x30"a(4,9) = "0x30"a(4,10)= "0xfe"a(5,1) = "0xfe" '数字5
a(5,2) = "0xfe"a(5,3) = "0x06"a(5,4) = "0x06"a(5,5) = "0x3e"a(5,6) = "0x60"a(5,7) = "0xc0"a(5,8) = "0xc3"a(5,9) = "0x66"a(5,10)= "0x3c"a(6,1) = "0x60" '数字6
a(6,2) = "0x30"a(6,3) = "0x18"a(6,4) = "0x0c"a(6,5) = "0x3e"a(6,6) = "0x63"a(6,7) = "0xc3"a(6,8) = "0xc3"a(6,9) = "0x66"a(6,10) ="0x3c"a(7,1) = "0xff" '数字7
a(7,2) = "0xc0"a(7,3) = "0x60"a(7,4) = "0x30"a(7,5) = "0x18"a(7,6) = "0x18"a(7,7) = "0x18"a(7,8) = "0x18"a(7,9) = "0x18"a(7,10)= "0x18"a(8,1) = "0x3c" '数字8
a(8,2) = "0x66"a(8,3) = "0xc3"a(8,4) = "0x66"a(8,5) = "0x3c"a(8,6) = "0x66"a(8,7) = "0xc3"a(8,8) = "0xc3"a(8,9) = "0x66"a(8,10)= "0x3c"a(9,1) = "0x3c" '数字9
a(9,2) = "0x66"a(9,3) = "0xc3"a(9,4) = "0xc3"a(9,5) = "0x66"a(9,6) = "0x3c"a(9,7) = "0x18"a(9,8) = "0x0c"a(9,9) = "0x06"a(9,10)= "0x03"%>

系统提示：这是一个从旧版导入的帖子，如有问题请参照原帖（原帖地址见顶楼）。