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2. Certificate Transparency - Known logs. https://www.certificate-transparency.org/known-logs. Certificate Transparency - Known logs. https://www.certificate-transparency.org/known-logs.
3. Google transparency report - https - https usage. https://www.google.com/transparencyreport/https/metrics/?hl=en. Google transparency report - https - https usage. https://www.google.com/transparencyreport/https/metrics/?hl=en.
4. R. Barnes J. Hoffman-Andrews and J. Kasten. Automatic Certificate Management Environment (ACME). draft-ietf-acme-acme-03 July 2016. R. Barnes J. Hoffman-Andrews and J. Kasten. Automatic Certificate Management Environment (ACME). draft-ietf-acme-acme-03 July 2016.
5. Towards an AS-to-organization map