auditing-tls-certificate-transparency-logs

Monitor Certificate Transparency logs by querying crt.sh data to identify new certificates for owned domains, comparing issuers against a baseline of authorized CAs, and generating alerts for unauthorized issuance. This tracks misissuance and hidden attack surfaces.

You can discover subdomains using CT log data by extracting SAN and NAME fields from certificate records. This surfaces wildcard and historical subdomains, mapping your asset inventory and assessing external exposure across owned domains.

Automated CT log auditing requires access to crt.sh, DNS resolution capabilities, and a baseline of authorized CAs. You also need an automated pipeline to store findings and generate alerts for incident response and governance.

Certificate transparency data detects typosquats and phishing infrastructure by mapping newly issued certificates that closely resemble owned domains. Analyzing CT-derived surface data preempts brand abuse and flags malicious infrastructure early.

This CT monitoring workflow requires the Python requests library to interact with external APIs. It is implemented as scripts that query crt.sh and resolve DNS to build the automated pipeline for storing findings and triggering alerts.