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。:-)

 1   
 2'最简单的加密方法：XOR   
 3'----------------------   
 4  
 5g_CryptThis = "中国-China"   
 6strFullKeyLen = Len(g_CryptThis)   
 7  
 8strFullKey = KeyGen(strFullKeyLen)   
 9  
10Response.Write "

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

'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 &amp; 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 &amp; 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 &amp; Mid(Poss,Int((UB - 0 + 1) * Rnd + 1),1)
Next
KeyGen = Temp
End Function