LoRa-Based Physical Layer Key Generation for Secure V2V/V2I Communications

. 2020 Jan 26;20(3):682. doi: 10.3390/s20030682

Algorithm 1: Multi-bit quantization algorithm.

Require: List R of RSSI signal measurements.

Ensure: initial key sequence

K_{1}

$R a n g e$ = Max(R) − Min(R)
$i n t e r v a l$ = $R a n g e$ ÷ 16
$K_{1}$ = $b l a n k_s t r i n g$
for $i = 1$ $t o$ $l e n g t h (R)$ do
for $j = 0$ $t o$ 15 do
if ( $R [i]$ > Min(R) + j * $i n t e r v a l$ ) & ( $R [i]$ <= Min(R) + $(j + 1)$ * $i n t e r v a l$ ) then
$t e m p \leftarrow$ Graycode(j)
$K_{1}$ $+ =$ $t e m p$
end if
end for
end for