1. A sends a timestamped message to the public-key authority containing a
request for the current public key of B.
2. The authority responds with a message that is encrypted using the authority’s pri-vate key, .Thus,A is able to decrypt the message using the authority’s pub-lic key. There fore,A is assured that the message originated with the authority. The
message includes the following:
• B’s public key, , which A can use to encrypt messages destined for B
• The original request used to enable A to match this response with the cor-responding earlier request and to verify that the original request was not
altered before reception by the authority
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