Consider the following hash function. Messages are in the form of a sequence of numbers in Zn$,$M $=($a$1,$ a$2,...,$ at$).$ The hash value h is calculated as $($Pti$=1$ a$2$i $)$ mod n for some predefined value n$.$Consider the following hash function. Messages are in the form of a sequence of numbers in Zn$,$M $=($a$1,$ a$2,...,$ at$).$ The hash value h is calculated as $($Pti$=1$ a$2$i $)$ mod n for some predefined value n$.$