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ChemOrbis uses 128 bit long key in order to provide a higher security level on its web site. If your current browser does not support that feature, it allows a lower security level communication.
In case your browser is Internet Explorer 5.01 or a lower version and does not support 128 bit long keys, you can download 128 bit support package from : http://www.microsoft.com/Windows/ie/downloads/recommended/128bit/...
You can understand whether or not your browser supports 128 bit, by putting your mouse cursor on the yellow lock at the bottom of a secure page.
