To ensure the security of sensitive Web content, an organization must use TLS and do so correctly. However, little is known about how TLS is actually used on the Web. In this work, we perform large-scale Internet-wide measurements to determine if Web sites use TLS when needed and when they do, if they use it correctly. We find hundreds of thousands of pages where TLS is either not used when it should be or is used improperly, putting sensitive data at risk.
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