Is there a method by which JavaScript can detect which level of encryption is being used on a browser? I understand how to detect browser vendor, version, etc., but one version may implement strong or weak encryption. Anyone been able to detect this?
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Netscape says on page
http://help.netscape.com/k
Of the navigator.appVersion
Example: Mozilla/4.06 [en] (WinNT; U)
the last character is your security grade. U is US, 128-bit and I is International, 40-bit.
so
<SCRIPT>
if (navigator.appName.indexOf
if (navigator.appVersion.inde
else location = '40bit.html';
}
</SCRIPT>
should work in NS
Business Accounts
Answer for Membership
by: kmartin7Posted on 1999-02-08 at 14:48:11ID: 1280733
I copied this information from the Microsoft SiteBuilder Network:
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Probably the best and easiest way to check the encryption strength of a browser, and redirect users, is through Microsoft Windows NT Server and IIS 4.0 .
One of the new features offered with IIS 4.0 is complete control over server-error messages -- not only for your default server site, but individually for each virtual directory you have set up on your server. No longer do you have to put up with those cryptic server messages that not even the server manager could decipher. Now you can make your visitor's experience a more pleasurable one.
Should a connection fail when trying to connect to a secure site requiring a 128-bit browser, the user will receive a 403.5 error, "Security Socket Layer (SSL) 128 required." Through use of the new Management Console application, you can bring up the Properties dialog for the server and change the default settings for this error -- pointing to another location on your server and redirecting the user to your "40-bit" page.
The best part? This solution is browser-independent! With Internet Explorer 4.0 , there is no other way at this time to specifically detect whether a user is using the 128-bit or 40-bit version. With Netscape's browser, you can check the header information, because the encryption strength is being passed there by the browser. But we should warn you that it is possible to modify the user-agent header, so this isn't a guaranteed solution.
****
So the answer is "no", it cannot be done using JavaScript. There is another open question with this subject (reference Q.10120287), and no one has been able to answer it with anything other than this option (above). Sorry...
Kurt