文本加密解密

<SCRIPT LANGUAGE="JavaScript">   
<!-- Begin   
function Encrypt(theText) {   
output = new String;   
Temp = new Array();   
Temp2 = new Array();   
TextSize = theText.length;   
for (i = 0; i < TextSize; i++) {   
rnd = Math.round(Math.random() * 122) + 68;   
Temp[i] = theText.charCodeAt(i) + rnd;   
Temp2[i] = rnd;   
}   
for (i = 0; i < TextSize; i++) {   
output += String.fromCharCode(Temp[i], Temp2[i]);   
}   
return output;   
}   
function unEncrypt(theText) {   
output = new String;   
Temp = new Array();   
Temp2 = new Array();   
TextSize = theText.length;   
for (i = 0; i < TextSize; i++) {   
Temp[i] = theText.charCodeAt(i);   
Temp2[i] = theText.charCodeAt(i + 1);   
}   
for (i = 0; i < TextSize; i = i+2) {   
output += String.fromCharCode(Temp[i] - Temp2[i]);   
}   
return output;   
}   
// End -->   
</script>