As of April 30th 2018, Chrome now requires that all certificates issued by a public certificate authority be logged in multiple public Certificate Transparency (CT) logs, ensuring that anyone can audit all certificates that have been issued. (Update: Microsoft Edge 79+ also mandates CT). CT logs allow site owners and security researchers to much more easily detectContinue reading “Fight Phish with Facebook (and Certificate Transparency)”
Category Archives: security
SSLVersionMin Policy returns to Chrome 66
Chrome 66, releasing to stable this week, again supports the SSLVersionMin policy that enables administrators to control the minimum version of TLS that Chrome is willing to negotiate with a server. If this policy is in effect and configured to permit, say, only TLS/1.2+ connections, attempting to connect to a site that only supports TLS/1.0Continue reading “SSLVersionMin Policy returns to Chrome 66”
HSTS Preload and Subdomains
In order to be eligible for the HSTS Preload list, your site must usually serve a Strict-Transport-Security header with an includeSubdomains directive. Unfortunately, some sites do not follow the best practices recommended and instead just set a one-year preload header with includeSubdomains and then immediately request addition to the HSTS Preload list. The result is thatContinue reading “HSTS Preload and Subdomains”
NET::ERR_CERT_INVALID error
Some users report that after updating their Operating System or Chrome browser to a more recent version, they have problems accessing some sites (often internal sites with self-signed certificates) and the browser shows an error of NET::ERR_CERT_INVALID. NET::ERR_CERT_INVALID means that a certificate was itself is so malformed that it’s not accepted at all– sometimes rejected byContinue reading “NET::ERR_CERT_INVALID error”
Understanding the Limitations of HTTPS
A colleague recently forwarded me an article about the hazards of browsing on public WiFi with the question: “Doesn’t HTTPS fix this?” And the answer is, “Yes, generally.” As with most interesting questions, however, the complete answer is a bit more complicated. HTTPS is a powerful technology for helping secure the web; all websites should beContinue reading “Understanding the Limitations of HTTPS”
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