A security hole in many major browsers called "logjam" is being reported. The attack makes use of a weakness in a cryptographic algorithm used to make connections secure. If you go to the site reporting the exploit, it will tell you if your browser is vulnerable to the attack. Browsers are supposedly preparing updates but as of this writing I found my Windows browsers Chrome version 43.0.2357.65 m (64-bit) and Firefox version 38.0.1 to be vulnerable. Both claim to be up to date. My iPad Safari browser and my Android 5.0 browser were also rated vulnerable. Internet Explorer update version 11.0.19 was rated as not vulnerable.
Keep checking to see if updates are available. In the meantime, be aware that your supposedly secure browsing may not be secure. More information here. Security expert Bruce Schneier reports that this exploit may have been used by the NSA.
Added: An alternate test site can be found here: https://www.ssllabs.com/ssltest/viewMyClient.html
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This tips section is maintained by Vic Laurie. Vic runs several websites with Windows how-to's, guides, and tutorials, including a site for learning about Windows and the Internet and another with Windows 7 tips.
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