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Abstract

In this paper, we carefully study both distinguishing and key-recovery attacks against Bluetooth two-level EO given many short frames. Based on a flaw in the resynchronization of Bluetooth EO, we are able to fully exploit the largest bias of the finite state machine inside EO for our attacks. Our key-recovery attack works with 240 simple operations given the first 24 bits of 235 frames. Compared with all existing attacks against two-level EO, this is the best one so far

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