Describe three functions of a certificate authority (CA).
What will be an ideal response?
The CA performs many housekeeping activities regarding the use of keys and certificates that are issued and used in the zone of authority for which it is established. Each user authenticates him or herself with the CA, and the CA can issue new or replacement keys, track issued keys, provide a directory of public-key values for all known users, and perform other management activities. When a private key is compromised or when the user loses the privilege of using keys in the area of authority, the CA can revoke the user's keys. The CA periodically distributes a certificate revocation list (CRL) to all users. When important events occur, specific applications can make a real-time request to the CA to verify any user against the current CRL.
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In Java, the keyword ____ tells the Java compiler that the class being declared is a subclass of the class whose name comes next.
A. implements B. continue C. extends D. protected
Consider the graph G shown in Figure 2.47 (reproduced in this document as Figure 2.5). Answer the following.
