Means that a transmitter uses physical feedback from a receiver to determine whether another transmission is in progress before initiating a transmission Select get from device to retrieve the current information on the receiver That is, it tries to detect the presence of a carrier wave from another station before attempting to transmit.
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In electronics, a super heterodyne receiver (often shortened to superhet) uses frequency mixing to convert a received signal to a fixed intermediate frequency (if) which can be more conveniently processed than the original radio carrier frequency.
Public key cryptography symmetric key crypto requires sender, receiver know shared secret key q
How to agree on key in first place (particularly if never “met”)? When we started this work, our primary goal was to get very low latency, close to hardware limit, for short messages but we also wanted to achieve that even when network is running at high load and achieve that through a practical design for commodity fabrics.
