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Island 6 · Security · Port 6.4

TLS basics: certificates & CAs

Ask the Captain
Instagram
Anyone can say "I'm your bank". How does your browser know?
You'll learn to

explain how a CA signs and why browsers trust it

Recap

  1. 1Certificate = public key + identity + CA signature
  2. 2key → CSR → the CA signs → certificate
  3. 3Browsers check the SANs, not the CN
Check yourself

Why does your browser trust your bank's certificate?

6.4

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