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Digital Certificates & Public Key Infrastructure (PKI)

📑 5 slides 👁 14 views 📅 8/17/2026
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Digital Certificates & Public Key Infrastructure (PKI)

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The Problem: Can We Trust a Website?

  • User opens a website, but how do they know it's genuine?
  • Fake websites can impersonate real ones
  • We need digital trust to verify identities
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What is Digital Trust?

  • Authentication: Who are you?
  • Integrity: Has the data been modified?
  • Confidentiality: Can unauthorized people read the data?
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Public Key Cryptography

  • Public key can be shared
  • Private key must remain secret
  • They form a cryptographic key pair
Public Key Cryptography
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What is a Digital Certificate?

  • Digital Certificate = Digital ID Card
  • Binds identity with a public key
  • Issued by a trusted Certificate Authority
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