c$)$ It is known that the gift voucher code is generated by the MD$5$

hash function, taking A$||$ClientID$||$B as input, that is$,$

$=5(||$ClientID$||$B$),$

where $||$ indicates append, A$=[$aa$,$ab$,...,$az$,$ba$,$bb$,...,,$zz$]$ is a set of

two lowercase alphabet characters; B$=[$##$,^$@$,...,^$&$]$ is a set of two

symbols $($allowing to have two same symbols such as ##$)$; ClientID

is your $7-$digit UOW student number, such as $1234567.$ Using the

hash cracking tool we used during the lab, find the two$-$alphabet

character from A and the two$-$symbol character from B that the

server used to generate a gift voucher code. $(20$ marks$)$