Generating the Conversation Key for Secure RPC

When the user initiates a transaction with a server, the following occurs:

1. The keyserver randomly generates a conversation key.

2. The kernel uses the conversation key, plus other material, to encrypt the client's timestamp.

3. The keyserver looks up the server's public key in the public key database. For more information, see the publickey(4) man page.

4. The keyserver uses the client's secret key and the server's public key to create a common key.

5. The keyserver encrypts the conversation key with the common key.