Individual skill
auditing-tls-certificate-transparency-logs
Monitors Certificate Transparency (CT) logs to detect unauthorized certificate issuance, discover subdomains via CT data, and alert on suspicious certificate activity for owned domains. Uses the crt.sh API and direct CT log querying based on RFC 6962 to build continuous monitoring pipelines that catch rogue certificates, track CA behavior, and map the external attack surface. Activates for requests involving certificate transparency monitoring, CT log auditing, subdomain discovery via certificates, or certificate issuance alerting.
skills/auditing-tls-certificate-transparency-logs/SKILL.md
Source commit 54a798831d2266a3ca61ce68a7acb80b81160d57
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- Network or broad shell
- Last checked
- Nov 9, 2026
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Repository context
- Repository stars (not skill ratings)
- 35,916
- Repository last updated
- Aug 31, 2026
- License
- Apache-2.0
Observed agent integration: No specific integration evidence. Standard SKILL.md installation does not imply verified compatibility.
- ai-agents Repository topic
- claude-code Repository topic
- cybersecurity Repository topic
- incident-response Repository topic
- mitre-attack Repository topic
- penetration-testing Repository topic
- red-team Repository topic
- security Repository topic
- cloud-security Repository topic
- malware-analysis Repository topic
- certificate-transparency Declared skill tag
- ct-logs Declared skill tag
- crt-sh Declared skill tag
- subdomain-discovery Declared skill tag
- tls-monitoring Declared skill tag
- rfc-6962 Declared skill tag
- data Derived category
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# Auditing TLS Certificate Transparency Logs
## When to Use
- Monitoring owned domains for unauthorized or unexpected certificate issuance by unknown Certificate Authorities
- Discovering subdomains and hidden services through certificates logged in public CT logs
- Detecting phishing infrastructure that uses look-alike domain certificates (typosquatting, homograph attacks)
- Auditing Certificate Authority compliance by verifying all issued certificates appear in CT logs as required by browser policies
- Building continuous certificate monitoring into a security operations pipeline with alerting for new issuances
**Do not use** for attacking or disrupting Certificate Authorities, for scraping CT logs in violation of rate limits or terms of service, or as the sole method of subdomain enumeration without corroborating results through DNS verification.
## Prerequisites
- Python 3.10+ with `requests`, `cryptography`, and `pyOpenSSL` libraries installed