[Cryptography] KDC, CA, PKI, PGP

(1) KDC

 key distribution center
 for reducing the number of keys
 the place to manage and store the public key 

 KDC is the place to store and save the public key, but these PBs don't indicate the key owner.

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(2) CA

  Certificate authority
  KDC can't indicate the key owner, but CA creates a certificate containing sender's public key and digital signed

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