An Analysis of 350 Million SSL Connections

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Lee Butterman created a dataset of 350 million SSL connections and then mined that for information on the state of SSL/TLS.

On the one hand, Let’s Encrypt was by far the largest registrar, accounting for almost 30 percent of the certs in Butterman’s dataset.

On the other hand, Butterman found that 3 million domains allowed RC4 or 3DES connections, and more than 4 million relied on outdated TLS including TLS 1.0 and 1.2.

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