繁體中文当前位置: 首页 > 图文教程 > 网络编程 > ASP > 验证码的程序及原理
- ASP
- Asp+Sql 对数据库的各种操作
- ASP:6行代码实现无组件上传
- ASP中几种分页显示的比较
- ASP中数据库调用中常见错误的现象和解决
- ASP实用技巧：强制刷新和判断文件地址
- asp全站防止注入的代码
- ASP如何获取客户端真实IP地址
- ASP实现可显示和隐藏的树型菜单
- 如何用ASP获取真实IP地址
- ASP与SQL数据库连接代码
- 拒绝攻击 万能Asp防注入代码
- 草根站长成长计划：跟我学新云采集入门(2)
- ASP技巧：提高使用Request集合的效率
- Asp用存储过程实现数据分页
- 做网页时常用的ASP函数
- Asp编码优化技巧八则
- ASP中Cache技术的应用
- 用ASP封IP的方法，防止固定IP垃圾留言
- ASP实现一行多列显示方法实例程序
- ASP实现动态添加表单内容的实例程序
ASP 中的 验证码的程序及原理
出处:互联网 整理: 软晨网（RuanChen.com） 发布: 2009-11-03 浏览: 26 ::
收藏到网摘: n/a
##### 部分程序取自网络
##### 作者：扬子
##### Email: [email protected]
##### 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 [email protected] ###
'### 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 [email protected] ###
'### 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 = U
评论 (0) All
