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Using an asymmetric key is known as __________ because it guarantees authenticity but not confidentiality.
One-way function
Open message format
Trapdoor
Closed message
The correct response is open message format. An asymmetric key system is known as an open message format because it guarantees only authenticity and not confidentiality. Trapdoors are used to resolve the reverse operation of a one-way function and a one-way function is computed in one direction but not in the opposite.
Note: This question makes no sense and needs to be reworded. Not even sure what you were going for here...
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