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Efficient Physical Layer Key Agreement for FlexRay NetworksFebruary 11th, 2020
We now consider a more practical example based on the number of usable bits in the symbol window as presented in Table III. For a practical bitrate of 5 Mbit/s, there are 376 bits available which leads to l = 47 (the number of bits in the symbol window is divided by 8 according to step 3 of the protocol description). Figure 11 shows the probability of extracting exactly k bits (left) and of extracting less than k bits (right) for l = 47 and k [0..4l]. On average, 94 bits can be extracted from each symbol window. Extracting 128 bits for an AES key may be set as reference point, a case in which 2 symbol windows will be needed. The probability of extracting less than 64 bits in one window is very small, i.e.,
