D) private key encryption
65. A digital certificate system
A) uses digital signatures to validate a user’s identity.
B) uses third–party CAs to validate a user’s identity.
C) uses tokens to validate a user’s identity.
D) is used primarily by individuals for personal correspondence.
66. Downtime refers to periods of time in which a
A) computer system is malfunctioning.
B) computer is not online.
C) company or organization is not operational.
D) computer system is not operational.
67. For 100% availability, online transaction processing requires
A) high–capacity storage.
B) fault–tolerant computer systems.
C) a multi–tier server network.
D) dedicated phone lines.