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how to Encrypt/Decrypt querystring?

Hi Experts,
I need to encrypt/decrypt my querystring in code behind.
And I need to decrypt that querystring in javascript also.

For fetching qurerystring in javascript I am using
<script type="text/javascript">
var str = window.location.search.substring(1);
var keyvalArr = str.split('&');
for(var i=0; i<keyvalArr.length; i++){
var key = keyvalArr[i].split('=');
if(key[0]=='userid'){
alert(key[1]);
break;
}}

</script>

and in code behind I am using request.querystring

Now I want to encrypt the querysting and it should be accessible in javascript and code behind too.
How to do this?

sybe

What is the point of encrypting a querystring when you use a client-side function to decrypt it? That (client-side) function will be accessible to every one browsing your page.

Ivo Stoykov

look following sample for code behind. I doubt there is sense to encrypt anything in javascript (at client) because if you could encrypt, somebody could decrypt it ;-)
HTH
Ivo Styoykov

public string encryptQueryString(string strQueryString) {
    ExtractAndSerialize.Encryption64 oES = 
        new ExtractAndSerialize.Encryption64();
    return oES.Encrypt(strQueryString,"!#$a54?3");
}
 
public string decryptQueryString(string strQueryString) {
    ExtractAndSerialize.Encryption64 oES = 
        new ExtractAndSerialize.Encryption64();
    return oES.Decrypt(strQueryString,"!#$a54?3");
}

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Johny Bravo

ASKER

I am creating an XML file depending on the value of querystring.
The table is populated according to the XML file with the use of javascript.So I need to know what is the value of querystring to get that particular XML file.
I don't need to encrypt in javascript,I just want to decrypt in javascript to get the value.

In code-behind I need both encryption/decryption .

ASKER CERTIFIED SOLUTION

Ivo Stoykov

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Johny Bravo

ASKER

Hi ivostoykov,
What I was thinking was,I will encrypt/decrypt the querystring in code behind.
And as I need to know querystring value t fetch the particular XML,I will decrypt it in javascript also.

But now as per your comment I think that that is not good .

Is there any other way that I will change the querysting that I can know I both code behind and javascript.

Johny Bravo

ASKER

I think I was on wrong track.Thanks

Ivo Stoykov

you have encrypt/decrypt functions in JS but they are more for compatibility use rather than for security.

Same for encode/decode pair.

HTH

Ivo Sotykov