Checking Client's Cipher Strength with IIS
| From: | Ed Gorski | Date: | Wed, 28 May 2003 17:02:42 +0000 |
| Subject: | Checking Client's Cipher Strength with IIS | ||
| Groups: | php.general | ||
| Request: | Send a blank email to php-general+get-149291@lists.php.net to get a copy of this message | ||
Hello,
I have a question who's answer has been bugging me for a while. What I need
to do is write a script that detects if a browser is using 128-bit
encryption when connecting to our website. While this is easy for most (I
have the script working for them), a real problem for me has come up with
clients that run IE on Windows 2K without 128-bit support (ie 40-bit or 56
instead). Do any of you fine ladies and gentlemen know how to detect a
browser's cipher strength using PHP (or any other web language)? I am
running PHP 4.3.1 on IIS 5.0 on a Windows 2000 server. I have tried using
some server vars (namely HTTPS_KEYSIZE) but that reports incorrect data with
the win2k/IE/56-bit configuration I mentioned above.
Any help is appreciated and thanks in advance,
Ed