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We consider the wiretap channel model under the presence of a hybrid, halfduplex adversary that is capable of either jamming or eavesdropping at a giventime. We analyzed the achievable rates under a variety of scenarios involvingdifferent methods for obtaining transmitter CSI. Each method provides adifferent grade of information, not only to the transmitter on the mainchannel, but also to the adversary on all channels. Our analysis shows thatmain CSI is more valuable for the adversary than the jamming CSI in bothdelay-limited and ergodic scenarios. Similarly, in certain cases under theergodic scenario, interestingly, no CSI may lead to higher achievable secrecyrates than with CSI.

To Obtain or not to Obtain CSI in the Presence of Hybrid Adversary