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The distribution of public keys is often done through a certificate authority or CA. Alice sends a public key to the CA. The CA verifies Alices identification, and then creates a certificate of Alices public key and sends it to Alice. The certificate contains time of creation, validity period, and the ID of Alice, and the public key. And, it is signed using a CAs public key. Alice can then send this certificate to any user, say Bob. Or, Alice can publish it so that any user can get it. It is assumed that all users have the CAs public key, and therefore a user, say Bob, can use the CAs public key to verify the certificate and obtain Alices public key. Likewise, Bob can get his certificate and send it to Alice so that Alice has Bobs public key.
