A site may offer an RC4 connection option out of necessity for compatibility with certain browsers so use the sites rankings as a guideline, not an iron clad declaration of security or lack thereof. True, it is less resistant to brute force attempts than something like RSA or ECDH, but it isn’t necessarily bad. SSL Labs slams RC4 as a weak encryption algorithm even though there are no known attacks against it. Just because a site doesn’t receive an A rating doesn’t mean the folks running them are doing a bad job. You can also see how services you use regularly stack up. If you go to, you can see exactly how your server is responding to HTTPS requests.
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Thankfully the good folks at Qualys are providing SSL Labs to all of us free of charge.
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How to See Where You Standīefore we start, you might want to know where your site stands. Not catastrophic, but definitely not good. Unfortunately, by default, IIS provides some pretty poor options. The simple act of offering up these bad encryption options makes your site, your server, and your users potentially vulnerable. If your site is offering up some ECDH options but also some DES options, your server will connect on either. A browser can connect to a server using any of the options the server provides. Some use really great encryption algorithms (ECDH), others are less great (RSA), and some are just ill advised (DES). The fatal flaw in this is that not all of the encryption options are created equally.
Your browser goes down the list until it finds an encryption option it likes and we’re off and running. The server you’re connecting to replies to your browser with a list of encryption options to choose from in order of most preferred to least.
Chrome, Internet Explorer, and Safari all have similar methods of letting you know your connection is encrypted. Firefox offers up a little lock icon to illustrate the point further. This is most easily identified by a URL starting with “HTTPS://”. Your browser initiates a secure connection to a site.
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