Keep Your Certificates Up To Date

Someone from a major aerospace manufacturer asked me for some cybersecurity assistance a few months ago. A security audit had resulted in a worrying but mystifying warning about SSL certificates. Their secure web site would cease functioning in just a few days. We fixed that, but similar deadlines are approaching over the next two years […]
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What Does The Recent SHA-1 Attack Mean For You And Your Organization?

Some top cryptographers have recently announced a significant step toward breaking the SHA-1 hash algorithm. Their work is described here and here, and also check out their paper. What does this mean for you and your organization? Let me start with a bit of background so the following makes sense. What Is A Hash? A […]
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Darkhotel Shows That Hotel Cyber Security is Even Worse Than We Thought

I recently wrote about cyber security and hotels. Now Kaspersky Labs has reported that things are even more dangerous than we realized. Darkhotel is an APT or Advanced Persistent Threat. Since at least 2007 this sophisticated attack has targeted executives staying in luxury hotels in Asia, mostly in Japan. The technology and targeting suggest state-level […]
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The Internet Has Serious Trust Problems, Part 4: Trouble in Turkey, Carefully Corrected

Last week, the week before, and the week before that, I explained how the cryptographic side of digital certificates and secure web site identity works, and how there have been some continuing problems with what many see as misbehavior by root CAs. We introduce the technical side in in Learning Tree’s System and Network Security […]
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The Internet Has Serious Trust Problems, Part 3: Subordinate CA Certificates Lead to Policy Changes

Last week and the week before I explained how the cryptographic side of digital certificates and secure web site identity works, as we discuss in in Learning Tree’s System and Network Security Introduction course, but there are continuing problems with corporate trust caused by what many see as misbehavior by root CAs.. ANSSI was discovered […]
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