Linters are essential tools for checking certificate compliance, but they shouldn't be the only line of defense against misissuance. Here's why CAs shouldn't solely rely on linters:

Key Points About Linters:

• They perform objective checks on certificates to verify compliance
• Popular open-source options include ZLint and Pkilint
• Can be used pre-issuance or post-issuance for verification

Limitations of Linters:

• No single linter covers all possible requirements
• Being open-source projects, updates may lag behind new requirements
• They are necessary but not sufficient for complete compliance

Why Blaming Linters is Problematic:

1. Incomplete Coverage: Linters cannot catch every possible issue
2. Time Gaps: New requirements may not be immediately implemented
3. Responsibility: CAs must maintain their own understanding and accountability

Best Practices for CAs:

• Use linters as part of a comprehensive verification process
• Maintain internal expertise and oversight
• Contribute to open-source linter projects when gaps are found
• Develop multiple safeguards beyond just linter checks

The Bottom Line: Linters are valuable tools for maintaining certificate quality, but they should be viewed as one component of a broader compliance strategy. CAs cannot outsource their responsibility to linters alone and must maintain active involvement in ensuring certificate compliance.

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