SEC3 — Chapter 13 - Sécurité

Criterion SEC3 : Valid SSL Certificate — guide + checklist

PART 1 - Fundamentals Chapter 13 - Sécurité Keyword : certificat ssl valide

This criterion seems “simple”, but it creates many discrepancies in production.

The **SEC3 — Valid SSL Certificate** criterion is part of our SEO checklist (335 criteria). Here, you have a **practical** method to check and fix it — with a concrete example.

What exactly this criterion covers

This criterion seems “simple”, but it creates many discrepancies in production.

**SEC3 — Valid SSL Certificate** (Chapter 13 - Security): Not expired, complete chain, correct domain

Why it matters (SEO + UX)

Why it matters: it is an anti-duplicate / anti-cannibalization safeguard. When poorly applied, we often observe: ambiguity (wrong associated query), duplication between pages, or performance loss on bounce rate.

On high-volume generated sites, this criterion also acts as a **safeguard**: a stable rule prevents 1,000 errors at once.

How to check (step by step)

Approach: check via crawl (list + export). Recommended tool: **SecurityHeaders.com**.

  1. Open the source code and locate the concerned element (tag/structure).
  2. Check hierarchy and coherence with H1 + intro.
  3. Run a crawl to detect pages violating the criterion.

Tip: first isolate 10 “representative” URLs (top pages + generated pages) before scaling the fix.

How to fix properly

Strategy: repair, re-crawl, and monitor in Search Console.

  • Verify HTTPS + clean redirects.
  • Add basic headers (HSTS, reasonable CSP) according to your stack.
  • Retest after deployment.

Then: re-crawl 50–200 URLs, then monitor Search Console for 7–14 days (impressions/CTR/indexing).

Concrete example (illustrative)

Example (illustrative):

  • **Context**: category page for auto garage in Casablanca
  • **Before**: HTTPS OK but headers missing (CSP/HSTS).
  • **After**: Added HSTS + reasonable CSP + secure cookies (if applicable).
  • **Note**: Goal: reduce risks and improve browser trust.

Checklist to tick

  • [ ] HTTPS everywhere
  • [ ] Respects: complete chain
  • [ ] Clean redirects
  • [ ] Basic headers tested
  • [ ] No mixed content
FAQ

Frequently asked questions — SEC3

What is the most common mistake on “Valid SSL Certificate”?

Trying to “optimize” by adding too many keywords, which degrades readability and creates repetitions.

Which tool is fastest for large-scale checking?

For this type of criterion, a crawl (e.g., Screaming Frog) plus targeted verification on SecurityHeaders.com is generally the fastest combo.

How to prevent recurrence on 10K generated pages?

Freeze an auto-generation rule (title/structure/schema/URLs) plus add automatic control (crawl or test) before production import.

Ready to go from theory to action?

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