Operating System (OS)
Trojan-Horse programs

usually are immediately discovered
are legitimate programs that allow unauthorized access
do not usually work
are hidden programs that do not show up on the system
None of these

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Operating System (OS)
A public key encryption system

does not encode the data before transmitting it
None of these
allows anyone to decode the transmission
allows only the correct sender to decode the data
allows only the correct receiver to decode the data

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