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what is a difference between message authentication and entity authentication? a - Message authentication and entity authentication are the same: there are no differences. b

what is a difference between message authentication and entity authentication?
a- Message authentication and entity authentication are the same: there are no differences.
b- Entity authentication requires repeating the process for each new message , while message authentication does not.
c- message authentication may not happen in real time ; entity authentication does.
d- message authentication occurs in real time , while entity authentication does not.

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