$(1)$

$n=713=2331$

$$:$R_{713}{R}_{23}{Z}_{31},(k)=(k_1\%)$

$($a$).$ Determine ${}^{-1}($with er planation$)$

$($b$)$ Determine for RSA, $(n,e)=(713,103)($See Sommits$)($i$)$ Encrypt $432($ii$)$ Decrypt $163$

$($o$)$ Determine the multiolicative orderi of $432$ mod $713$ and its inverse ${432}^{-1}$mod$713$