简单的加密方法:XOR

念书的时候使用对数据进行加密的方法最简单的就是异或了，看到有人想要加密算法，就把以前的资料翻了一下，整理了一系列加密的函数，当然简单的加密也是容易破解的，但聊胜于无（记得把密要钥放好了），总比让人一打开数据库就看见密码明码好吧。:-)

<%
最简单的加密方法：XOR
----------------------

g_CryptThis = "中国-China"
strFullKeyLen = Len(g_CryptThis)

strFullKey = KeyGen(strFullKeyLen)

Response.Write "原始字符串: " & g_CryptThis & ""
Response.Write "密钥: " & strFullKey & ""
Response.Write "加密后: " & Server.URLEncode(EnCrypt(g_CryptThis)) & ""
Response.Write "解密后: " & DeCrypt(EnCrypt(g_CryptThis)) & ""

异或加密
Function EnCrypt(strCryptThis)
 Dim strChar, iKeyChar, iStringChar, i
 for i = 1 to Len(strCryptThis)
 iKeyChar = Asc(mid(strFullKey,i,1))
 iStringChar = Asc(mid(strCryptThis,i,1))
 iCryptChar = iKeyChar Xor iStringChar
 strEncrypted = strEncrypted & Chr(iCryptChar)
 next
 EnCrypt = strEncrypted
End Function

异或解密
Function DeCrypt(strEncrypted)
Dim strChar, iKeyChar, iStringChar, i
 for i = 1 to Len(strEncrypted)
 iKeyChar = (Asc(mid(strFullKey,i,1)))
 iStringChar = Asc(mid(strEncrypted,i,1))
 iDeCryptChar = iKeyChar Xor iStringChar
 strDecrypted = strDecrypted & Chr(iDeCryptChar)
 next
 DeCrypt = strDecrypted
End Function

产生指定长度的随机密钥
Function KeyGen(strlength)
 Dim i,UB
 Dim Temp
 Dim Poss
 Poss = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
 Temp = ""

 UB = Len(Poss)
 For i = 1 To strlength
 Randomize
 Temp = Temp & Mid(Poss,Int((UB - 0 + 1) * Rnd + 1),1)
 Next
 KeyGen = Temp
End Function
%>

补充：综合编程 , 安全编程 ,