Decrypting the value through Javascript

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Dear All,

Iam encrypting value and storing it in a Cookie in Asp.net. Iam accessing the cookie in Javascript. Now Iam not getting how to decrypt that value in Javascript. Can anybody help plz??

Thanks..

Posted 31-Jan-13 0:46am

Venkat_C6

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Ankur^\m/ 31-Jan-13 6:51am

To know how to decrypt a value, you must know which encryption method you used or how you encrypted it.

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Stephen Hewison · Answer 1 · 2013-01-31T01:03:00

Getting encryption algorithms from technology to technology to encrypt and decrypt in the same way is notoriously difficult.

Also, if you're decrypting the cookie in JS then you must be rendering the decryption key into the page response.

This is not secure and as such negates the point of encrypting the data in the cookie in the first place.

My advice would be to use the ASP.Net engine to decrypt the value.

You can read the cookie using JS, if you'd prefer, and then pass the data via AJAX or a postback to the ASP.Net engine or you can read the cookie from the HttpRequest object as part of the request. Then use ASP.Net to do the decryption and provide the data.

This way you don't have to expose your keys to the client.

With modern browsers very little in your page response is secure. All browsers have development tool sets which allow you to interrogate the page response and the scripts being run by the page.

AdityaPratapSingh · Answer 2 · 2013-01-31T01:06:00

first u have to download
http://code.google.com/p/sail-web/source/browse/branches/vlewrapper-2.0/WebContent/vle/sound/md5_old.js?r=1815[^]

use it in page like

HTML

<script type="text/javascript" language="javascript" src="js/md5_old.js"></script>

HTML

<input type="button" style="border: 1px;" value="Log In"  önclick="LoginClicked()" />

JavaScript Function

HTML

function LoginClicked() {

            var pass = document.getElementById('<%=txtPassword.ClientID%>');
var md5encypt = hex_md5(pass.value);
}

Decrypting the value through Javascript

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