阿摩線上測驗
42. John recently received an email message from Bill. What cryptographic goal would need to be met to convince John that Bill was actually the sender of the message?
(A) Nonrepudiation
(B) Confidentiality
(C) Availability
(D) Integrity
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統計： A(1), B(0), C(0), D(0), E(0) #3560431
統計： A(1), B(0), C(0), D(0), E(0) #3560431
